On the entry and transit of high-density plasma across the polar cap

Journal of Geophysical Research: Space Physics

Volumn 115, Issue 12, 2010, Pages

  Oksavik, K ^a   Barth, V L ^a,b,c   Moen, J ^a,b   Lester, M ^d  

^a UNIVERSITY CENTRE IN SVALBARD   (Norway)

^b UNIVERSITY OF OSLO   (Norway)

^c NORWEGIAN POLAR INSTITUTE   (Norway)

^d UNIVERSITY OF LEICESTER   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 78649994807     PISSN: None     EISSN: 21699402     Source Type: Journal    
DOI: 10.1029/2010JA015817     Document Type: Article

References (98)

1. Baker, K. B., R. A. Greenwald, J. M. Ruohoniemi, J. R. Dudeney, M. Pinnock, P. T. Newell, M. E. Greenspan, and C.-I. Meng (1990), Simultaneous HF-radar and DMSP observations of the cusp, Geophys. Res. Lett., 17(11), 1869-1872, doi:10.1029/GL017i011p01869.
2. Barth, V. L. (2009), Identification and tracking of extreme electron densities by EISCAT Svalbard radar and SuperDARN, Master thesis, Univ. of Oslo, Norway.
3. Basu, S., S. Basu, E. MacKenzie, P. F. Fougere, W. R. Coley, N. C. Maynard, J. D. Winningham, M. Sugiura, W. B. Hanson, and W. R. Hoegy (1988), Simultaneous density and electric field fluctuation spectra associated with velocity shears in the auroral oval, J. Geophys. Res., 93 (A1), 115-136, doi:10.1029/JA093iA01p00115.
4. Basu, S., S. Basu, E. MacKenzie, W. R. Coley, J. R. Sharber, and W. R. Hoegy (1990), Plasma structuring by the gradient drift instability at high latitudes and comparison with velocity shear driven processes, J. Geophys. Res., 95 (A6), 7799-7818, doi:10.1029/JA095iA06p07799.
5. Basu, S., E. J. Weber, T. W. Bullett, M. J. Keskinen, E. MacKenzie, P. Doherty, R. Sheehan, H. Kuenzler, P. Ning, and J. Bongiolatti (1998), Characteristics of plasma structuring in the cusp/cleft region at Svalbard, Radio Sci., 33(6), 1885-1899, doi:10.1029/98RS01597.
6. Basu, S., K. M. Groves, Su. Basu, and P. J. Sultan (2002), Specification and forecasting of scintillations in communication/navigation links: Current status and future plans, J. Atmos. Sol. Terr. Phys., 64(16), 1745-1754.
7. Buchau, J., B. W. Reinisch, E. J. Weber, and J. G. Moore (1983), Structure and dynamics of the winter polar cap F region, Radio Sci., 18(6), 995-1010, doi:10.1029/RS018i006p00995.
8. Buchau, J., E. J. Weber, D. N. Anderson, H. C. Carlson Jr., J. G. Moore, B. W. Reinisch, and R. C. Livingston (1985), Ionospheric structures in the polar cap: Their origin and relation to 250-MHz scintillation, Radio Sci., 20(3), 325-338, doi:10.1029/RS020i003p00325.
9. Bust, G. S., and G. Crowley (2007), Tracking of polar cap ionospheric patches using data assimilation, J. Geophys. Res., 112, A05307, doi:10.1029/2005JA011597.
10. Carlson, H. C., Jr., K. Oksavik, J. Moen, and T. Pedersen (2004), Ionospheric patch formation: Direct measurements of the origin of a polar cap patch, Geophys. Res. Lett., 31, L08806, doi:10.1029/2003GL018166. (Pubitemid 38893052)
11. Carlson, H. C., J. Moen, K. Oksavik, C. P. Nielsen, I. W. McCrea, T. R. Pedersen, and P. Gallop (2006), Direct observations of injection events of subauroral plasma into the polar cap, Geophys. Res. Lett., 33, L05103, doi:10.1029/2005GL025230.
12. Carlson, H. C., T. Pedersen, S. Basu, M. Keskinen, and J. Moen (2007), Case for a new process, not mechanism, for cusp irregularity production, J. Geophys. Res., 112, A11304, doi:10.1029/2007JA012384.
13. Carlson, H. C., K. Oksavik, and J. Moen (2008), On a new process for cusp irregularity production, Ann. Geophys., 26, 2871-2885, doi:10.5194/angeo-26- 2871-2008.
14. Cowley, S. W. H. (1981), Magnetospheric and ionospheric flow and the interplanetary magnetic field, in The Physical Basis of the Ionosphere in the Solar-Terrestrial System, AGARD Conf. Proc., vol. 295, pp. 1-14, NATO, Neuilly Sur-Seine, France.
15. Cowley, S. W. H., and M. Lockwood (1992), Excitation and decay of solar wind-driven flowsinthe magnetosphere-ionosphere system, Ann. Geophys., 10, 103-115.
16. Crowley, G. (1996), Critical review of ionospheric patches and blobs, in Review of Radio Science 1993-1996, edited by W. R. Stone, pp. 619-648, Oxford Sci. Publ., Oxford, U. K.
17. Crowley, G., A. J. Ridley, D. Deist, S. Wing, D. J. Knipp, B. A. Emery, J. Foster, R. Heelis, M. Hairston, and B. W. Reinisch (2000), Transformation of high-latitude ionospheric F region patches into blobs during the March 21, 1990, storm, J. Geophys. Res., 105 (A3), 5215-5230, doi:10.1029/1999JA900357.
18. Dandekar, B. S. (2002), Solar cycle dependence of polar cap patch activity, Radio Sci., 37(1), 1013, doi:10.1029/2000RS002562.
19. Dandekar, B. S., and T. W. Bullett (1999), Morphology of polar cap patch activity, Radio Sci., 34(5), 1187-1205, doi:10.1029/1999RS900056.
20. Davies, J. A., M. Lester, S. E. Milan, and T. K. Yeoman (1999), A comparison of velocity measurements from the CUTLASS Finland radar and the EISCAT UHF system, Ann. Geophys., 17, 892-902, doi:10.1007/s00585-999-0892-9.
21. Denig, W. F., W. J. Burke, N. C. Maynard, F. J. Rich, B. Jacobsen, P. E. Sandholt, A. Egeland, S. Leontjev, and V. G. Vorobjev (1993), Ionospheric signatures of dayside magnetopause transients: A case study using satellite and ground measurements, J. Geophys. Res., 98 (A4), 5969-5980, doi:10.1029/ 92JA01541.
22. Drayton, R. A., A. V. Koustov, M. R. Hairston, and J.-P. Villain (2005), Comparison of DMSP cross-track ion drifts and SuperDARN line-ofsight velocities, Ann. Geophys., 23, 2479-2486, doi:10.5194/angeo-23-2479-2005.
23. Fairfield, D. H., and J. D. Scudder (1985), Polar rain: Solar coronal electrons in the Earth's magnetosphere, J. Geophys. Res., 90 (A5), 4055-4068, doi:10.1029/JA090iA05p04055.
24. Foster, J. C. (1993), Storm time plasma transport at middle and high latitudes, J. Geophys. Res., 98 (A2), 1675-1689, doi:10.1029/92JA02032.
25. Foster, J. C, and W. J. Burke (2002), SAPS: A new categorization for subauroral electric fields, Eos Trans. AGU, 83(36), 393-394, doi:10.1029/2002EO000289.
26. Foster, J. C, and J. R. Doupnik (1984), Plasma convection in the vicinity of the dayside cleft, J. Geophys. Res., 89 (A10), 9107-9113, doi:10.1029/JA089iA10p09107.
27. Foster, J. C, P. J. Erickson, F. D. Lind, and W. Rideout (2004), Millstone Hill coherent-scatter radar observations of electric field variability in the sub-auroral polarization stream, Geophys. Res. Lett., 31, L21803, doi:10.1029/2004GL021271. (Pubitemid 40190979)
28. Foster, J. C, et al. (2005), Multiradar observations of the polar tongue of ionization, J. Geophys. Res., 110, A09S31, doi:10.1029/2004JA010928. (Pubitemid 44228354)
29. Gillies, R. G., G. C. Hussey, G. J. Sofko, K. A. McWilliams, R. A. D. Fiori, P. Ponomarenko, and J.-P. St.-Maurice (2009), Improvement of Super-DARN velocity measurements by estimating the index of refraction in the scattering region using interferometry, J. Geophys. Res., 114, A07305, doi:10.1029/ 2008JA013967.
30. Gondarenko, N. A., and P. N. Guzdar (1999), Gradient drift instability in high latitude plasma patches: Ion inertial effects, Geophys. Res. Lett, 26(22), 3345-3348, doi:10.1029/1999GL003647. (Pubitemid 30098348)
31. Gondarenko, N. A., and P. N. Guzdar (2004a), Density and electric field fluctuations associated with the gradient drift instability in the high-latitude ionosphere, Geophys. Res. Lett, 31, L11802, doi:10.1029/2004GL019703. (Pubitemid 39103525)
32. Gondarenko, N. A., and P. N. Guzdar (2004b), Plasma patch structuring by the nonlinear evolution of the gradient drift instability in the high-latitude ionosphere, J. Geophys. Res., 109, A09301, doi:10.1029/2004JA010504.
33. Grant, I. F., J. W. MacDougall, J. M. Ruohoniemi, W. A. Bristow, G. J. Sofko, J. A. Koehler, D. Danskin, and D. André (1995), Comparison of plasma flow velocities determined by the ionosonde Doppler drift technique, SuperDARN radars, and patch motion, Radio Sci., 30(5), 1537-1549, doi:10.1029/95RS00831.
34. Hosokawa, K., K. Shiokawa, Y. Otsuka, A. Nakajima, T. Ogawa, and J. D. Kelly (2006), Estimating drift velocity of polar cap patches with all-sky airglow imager at Resolute Bay, Canada, Geophys. Res. Lett., 33, L15111, doi:10.1029/2006GL026916. (Pubitemid 44945770)
35. Hosokawa, K., K. Shiokawa, Y. Otsuka, T. Ogawa, J.-P. St-Maurice, G. J. Sofko, and D. A. Andre (2009a), Relationship between polar cap patches and field-aligned irregularities as observed with an all-sky airglow imager at Resolute Bay and the PolarDARN radar at Rankin Inlet, J. Geophys. Res., 114, A03306, doi:10.1029/2008JA013707.
36. Hosokawa, K., T. Tsugawa, K. Shiokawa, Y. Otsuka, T. Ogawa, and M. R. Hairston (2009b), Unusually elongated, bright airglow plume in the polar cap F region: Is it a tongue of ionization?, Geophys. Res. Lett, 36, L07103, doi:10.1029/2009GL037512.
37. Hosokawa, K., T. Kashimoto, S. Suzuki, K. Shiokawa, Y. Otsuka, and T. Ogawa (2009c), Motion of polar cap patches: A statistical study with all-sky airglow imager at Resolute Bay, Canada, J. Geophys. Res., 114, A04318, doi:10.1029/2008JA014020.
38. Keskinen, M. J., and S. L. Ossakow (1981), On the spatial power spectrum of the e × B gradient drift instability in ionospheric plasma clouds, J. Geophys. Res., 86 (A8), 6947-6950, doi:10.1029/JA086iA08p06947.
39. Keskinen, M. J., and S. L. Ossakow (1983), Theories of high-latitude ionospheric irregularities: A review, Radio Sci., 18(6), 1077-1091, doi:10.1029/RS018i006p01077.
40. Keskinen, M. J., H. G. Mitchell, J. A. Fedder, P. Satyanarayana, S. T. Zalesak, and J. D. Huba (1988), Nonlinear evolution of the Kelvin-Helmholtz instability in the high-latitude ionosphere, J. Geophys. Res., 93 (A1), 137-152, doi:10.1029/JA093iA01p00137.
41. Knudsen, W. C. (1974), Magnetospheric convection and the high-latitude F2 ionosphere, J. Geophys. Res., 79(7), 1046-1055, doi:10.1029/JA079i007p01046.
42. Lockwood, M., and H. C. Carlson Jr. (1992), Production of polar cap electron density patches by transient magnetopause reconnection, Geophys. Res. Lett, 19(17), 1731-1734, doi:10.1029/92GL01993.
43. Lockwood, M., P. E. Sandholt, S. W. H. Cowley, and T. Oguti (1989), Interplanetary magnetic field control of dayside auroral activity and the transfer of momentum across the dayside magnetopause, Planet. Space Sci., 37(11), 1347-1365, doi:10.1016/0032-0633 (89) 90106-2.
44. Lockwood, M., S. W. H. Cowley, and M. P. Freeman (1990), The excitation of plasma convection in the high-latitude ionosphere, J. Geophys. Res., 95 (A6), 7961-7972, doi:10.1029/JA095iA06p07961.
45. Lockwood, M., J. Moen, S. W. H. Cowley, A. D. Farmer, U. P. Løvhaug, H. Lühr, and V. N. Davda (1993), Variability of dayside convection and motions of the cusp/cleft aurora, Geophys. Res. Lett., 20(11), 1011-1014, doi:10.1029/93GL00846.
46. Lockwood, M., J. Moen, A. P. van Eyken, J. A. Davies, K. Oksavik, and I. W. McCrea (2005a), Motion of the dayside polar cap boundary during substorm cycles: I. Observations of pulses in the magnetopause reconnection rate, Ann. Geophys., 23, 3495-3511, doi:10.5194/angeo-23-3495-2005.
47. Lockwood, M., J. A. Davies, J. Moen, A. P. van Eyken, K. Oksavik, I. W. McCrea, and M. Lester (2005b), Motion of the dayside polar cap boundary during substorm cycles: II. Generation of poleward-moving events and polar cap patches by pulses in the magnetopause reconnection rate, Ann. Geophys., 23, 3513-3532, doi:10.5194/angeo-23-3513-2005.
48. Lorentzen, D. A., N. Shumilov, and J. Moen (2004), Drifting airglow patches in relation to tail reconnection, Geophys. Res. Lett., 31, L02806, doi:10.1029/2003GL017785.
49. McEwen, D. J., and D. P. Harris (1995), Observations of F layer patches and their convection over the north magnetic pole, Adv. Space Res., 16(1), 69-72, doi:10.1016/0273-1177 (95) 00101-J.
50. McEwen, D. J., and D. P. Harris (1996), Occurrence patterns of F layer patches over the north magnetic pole, Radio Sci., 31(3), 619-628, doi:10.1029/96RS00312.
51. McEwen, D. J., D. P. Harris, J. W. MacDougall, and I. F. Grant (1995), Drifting F-layer patches over the magnetic pole, J. Geomagn. Geoelectr., 47, 527-537.
52. McEwen, D. J., W. Guo, J. W. MacDougall, and P. T. Jayachandran (2004), The polar ionosphere, Adv. Space Res., 34(9), 2080-2084, doi:10.1016/j.asr.2004. 06.011.
53. Milan, S. E., M. Lester, and T. K. Yeoman (2002), HF radar polar patch formation revisited: Summer and winter variations indayside plasma structuring, Ann. Geophys., 20, 487-499, doi:10.5194/angeo-20-487-2002.
54. Milan, S. E., S. Basu, T. K. Yeoman, and R. E. Sheehan (2005), A comparison of satellite scintillation measurements with HF radar backscatter characteristics, Ann. Geophys., 23, 3451-3455, doi:10.5194/angeo-23-3451-2005.
55. Moen, J., P. E. Sandholt, M. Lockwood, W. F. Denig, U. P. Løvhaug, B. Lybekk, A. Egeland, D. Opsvik, and E. Friis-Christensen (1995), Events of enhanced convection and related dayside auroral activity, J. Geophys. Res., 100 (A12), 23, 917-23, 934, doi:10.1029/95JA02585.
56. Moen, J., H. C. Carlson, S. E. Milan, N. Shumilov, B. Lybekk, P. E. Sandholt, and M. Lester (2000), On the collocation between dayside auroral activity and coherent HF radar backscatter, Ann. Geophys., 18, 1531-1549, doi:10.1007/s00585-001-1531-2.
57. Moen, J., A. P. van Eyken, and H. C. Carlson (2001), EISCAT Svalbard Radar observations of ionospheric plasma dynamics in relation to dayside auroral transients, J. Geophys. Res., 106 (A10), 21, 453-21, 461, doi:10.1029/ 2000JA000378.
58. Moen, J., I. K. Walker, L. Kersley, and S. E. Milan (2002), On the generation of cusp HF backscatter irregularities, J. Geophys. Res., 107 (A4), 1044, doi:10.1029/2001JA000111.
59. Moen, J., K. Oksavik, and H. C. Carlson (2004), On the relationship between ion upflow events and cusp auroral transients, Geophys. Res. Lett., 31, L11808, doi:10.1029/2004GL020129. (Pubitemid 39103529)
60. Moen, J., H. C. Carlson, K. Oksavik, C. P. Nielsen, S. E. Pryse, H. R. Middleton, I. W. McCrea, and P. Gallop (2006), EISCAT observations of plasma patches at sub-auroral cusp latitudes, Ann. Geophys., 24, 2363-2374, doi:10.5194/angeo-24-2363-2006.
61. Moen, J., N. Gulbrandsen, D. A. Lorentzen, and H. C. Carlson (2007), On the MLT distribution of F region polar cap patches at night, Geophys. Res. Lett., 34, L14113, doi:10.1029/2007GL029632. (Pubitemid 47393957)
62. Moen, J., X. C. Qiu, H. C. Carlson, R. Fujii, and I. W. McCrea (2008a), On the diurnal variability in F2-region plasma density above the EISCAT Svalbard radar, Ann. Geophys., 26, 2427-2433, doi:10.5194/angeo-26-2427-2008.
63. Moen, J., Y. Rinne, H. C. Carlson, K. Oksavik, R. Fujii, and H. Opgenoorth (2008b), On the relationship between thin Birkeland current arcs and reversed flow channels in the winter cusp/cleft ionosphere, J. Geophys. Res., 113, A09220, doi:10.1029/2008JA013061.
64. Ogawa, Y., S. C. Buchert, R. Fujii, S. Nozawa, and A. P. van Eyken (2009), Characteristics of ion upflow and downflow observed with the European Incoherent Scatter Svalbard radar, J. Geophys. Res., 114, A05305, doi:10.1029/2008JA013817.
65. Oksavik, K., J. Moen, and H. C. Carlson (2004), High-resolution observations of the small-scale flow pattern associated with a poleward moving auroral form in the cusp, Geophys. Res. Lett., 31, L11807, doi:10.1029/ 2004GL019838. (Pubitemid 39103528)
66. Oksavik, K., J. Moen, H. C. Carlson, R. A. Greenwald, S. E. Milan, M. Lester, W. F. Denig, and R. J. Barnes (2005), Multi-instrument mapping of the small-scale flow dynamics related to a cusp auroral transient, Ann. Geophys., 23, 2657-2670, doi:10.5194/angeo-23-2657-2005.
67. Oksavik, K., J. M. Ruohoniemi, R. A. Greenwald, J. B. H. Baker, J. Moen, H. C. Carlson, T. K. Yeoman, and M. Lester (2006a), Observations of isolated polar cap patches by the European Incoherent Scatter (EISCAT) Svalbard and Super Dual Auroral Radar Network (SuperDARN) Finland radars, J. Geophys. Res., 111, A05310, doi:10.1029/2005JA011400.
68. Oksavik, K., R. A. Greenwald, J. M. Ruohoniemi, M. R. Hairston, L. J. Paxton, J. B. H. Baker, J. W. Gjerloev, and R. J. Barnes (2006b), First observations of the temporal/spatial variation of the sub-auroral polarization stream from the SuperDARN Wallops HF radar, Geophys. Res. Lett., 33, L12104, doi:10.1029/2006GL026256. (Pubitemid 44687699)
69. Ossakow, S. L., and P. K. Chaturvedi (1979), Current convective instability in the diffuse aurora, Geophys. Res. Lett., 6(4), 332-334, doi:10.1029/GL006i004p00332.
70. Pryse, S. E. (2003), Radio tomography: A new experimental technique, Surv. Geophys., 24, 1-38, doi:10.1023/A:1022272607747. (Pubitemid 36317931)
71. Pryse, S. E., A. G. Wood, H. R. Middleton, I. W. McCrea, and M. Lester (2006), Reconfiguration of polar-cap plasma in the magnetic midnight sector, Ann. Geophys., 24, 2201-2208, doi:10.5194/angeo-24-2201-2006.
72. Rinne, Y., J. Moen, K. Oksavik, and H. C. Carlson (2007), Reversed flow events in the winter cusp ionosphere observed by the European Incoherent Scatter (EISCAT) Svalbard radar, J. Geophys. Res., 112, A10313, doi:10.1029/ 2007JA012366.
73. Rodger, A. S., and A. C. Graham (1996), Diurnal and seasonal occurrence of polar cap patches, Ann. Geophys., 14, 533-537, doi:10.1007/s00585-996-0533-5.
74. Rodger, A. S., M. Pinnock, J. R. Dudeney, K. B. Baker, and R. A. Greenwald (1994a), A new mechanism for polar patch formation, J. Geophys. Res., 99 (A4), 6425-6436, doi:10.1029/93JA01501.
75. Rodger, A. S., M. Pinnock, J. R. Dudeney, J. Waterman, O. de la Beaujardiere, and K. B. Baker (1994b), Simultaneous two hemisphere observations of the presence of polar patches in the nightside ionosphere, Ann. Geophys., 12, 642-648, doi:10.1007/s00585-994-0642-y.
76. Ruohoniemi, J. M., and K. B. Baker (1998), Large-scale imaging of highlatitude convection with Super Dual Auroral Radar Network HF radar observations, J. Geophys. Res., 103 (A9), 20, 797-20, 811, doi:10.1029/ 98JA01288.
77. Ruohoniemi, J. M., and R. A. Greenwald (1996), Statistical patterns of high-latitude convection obtained from Goose Bay HF radar observations, J. Geophys. Res., 101 (A10), 21, 743-21, 763, doi:10.1029/96JA01584.
78. Ruohoniemi, J. M., R. A. Greenwald, K. B. Baker, J. P. Villain, and M. A. McCready (1987), Drift motions of small-scale irregularities in the highlatitude F region: An experimental comparison with plasma drift motions, J. Geophys. Res., 92 (A5), 4553-4564, doi:10.1029/JA092iA05p04553.
79. Sandholt, P. E., and C. J. Farrugia (2009), Plasma flow channels at the dawn/dusk polar cap boundaries: Momentum transfer on old open field lines and the roles of IMF By and conductivity gradients, Ann. Geophys., 27, 1527-1554, doi:10.5194/angeo-27-1527-2009.
80. Sato, T. (1959), Morphology of Ionospheric F2 disturbances in the polar region, Rep. Ionos. Space Res. Jpn., 13, 91-104.
81. Schunk, R. W., and J. J. Sojka (1996), Ionosphere-thermosphere space weather issues, J. Atmos. Terr. Phys., 58(14), 1527-1574, doi:10.1016/0021-9169 (96) 00029-3.
82. Siscoe, G., W. Lotko, and B. Sonnerup (1991), A high-latitude, low-latitude boundary layer model of the convection current system, J. Geophys. Res., 96 (A3), 3487-3495, doi:10.1029/90JA02362.
83. Siscoe, G. L., G. M. Erickson, B. U. Ö. Sonnerup, N. C. Maynard, K. D. Siebert, D. R. Weimer, and W. W. White (2000), Deflected magnetosheath flow at the high-latitude magnetopause, J. Geophys. Res., 105 (A6), 12, 851-12, 857, doi:10.1029/1999JA000268.
84. Stern, D. P. (1984), Magnetospheric dynamo processes, in Magnetospheric Currents, Geophys. Monogr. Ser, vol. 28, edited by T. A. Potemra, pp. 200-207, AGU, Washington, D. C.
85. Taguchi, S., M. Sugiura, J. D. Winningham, and J. A. Slavin (1993), Characterization of the IMF By-dependent field-aligned currents in the cleft region based on de 2 observations, J. Geophys. Res., 98 (A2), 1393-1407, doi:10.1029/92JA01014.
86. Tsunoda, R. T. (1988), High-latitude F region irregularities: A review and synthesis, Rev. Geophys., 26(4), 719-760, doi:10.1029/RG026i004p00719.
87. Tsyganenko, N. A. (1995), Modeling the Earth's magnetospheric magnetic field confined within a realistic magnetopause, J. Geophys. Res., 100 (A4), 5599-5612, doi:10.1029/94JA03193.
88. Tsyganenko, N. A. (1996), Effects of the solar wind conditions on the global magnetospheric configuration as deduced from data-based field models, Eur. Space Agency Spec. Publ, 389, 181-185.
89. Valladares, C. E., S. Basu, J. Buchau, and E. Friis-Christensen (1994), Experimental evidence for the formation and entry of patches into the polar cap, Radio Sci., 29(1), 167-194, doi:10.1029/93RS01579.
90. Valladares, C. E., D. T. Decker, R. Sheehan, and D. N. Anderson (1996), Modeling the formation of polar cap patches using large plasma flows, Radio Sci., 31(3), 573-593, doi:10.1029/96RS00481.
91. Villain, J. P., G. Caudal, and C. Hanuise (1985), A Safari-Eiscat comparison between the velocity of F region small-scale irregularities and the ion drift, J. Geophys. Res., 90 (A9), 8433-8443, doi:10.1029/JA090iA09p08433.
92. Walker, I. K., J. Moen, L. Kersley, and D. A. Lorentzen (1999), On the possible role of cusp/cleft precipitation in the formation of polar-cap patches, Ann. Geophys., 17, 1298-1305, doi:10.1007/s00585-999-1298-4.
93. Weber, E. J., J. Buchau, J. G. Moore, J. R. Sharber, R. C. Livingston, J. D. Winningham, and B. W. Reinisch (1984), F layer ionization patches in the polar cap, J. Geophys. Res., 89 (A3), 1683-1694, doi:10.1029/JA089iA03p01683.
94. Wood, A. G., S. E. Pryse, H. R. Middleton, and V. S. C. Howells (2008), Multi-instrument observations of nightside plasma patches under conditions of IMF Bz positive, Ann. Geophys., 26, 2203-2216, doi:10.5194/angeo-26-2203-2008.
95. Wood, A. G., S. E. Pryse, and J. Moen (2009), Modulation of nightside polar patches by substorm activity, Ann. Geophys., 27, 3923-3932, doi:10.5194/angeo-27-3923-2009.
96. Xu, L., A. V. Koustov, J. Thayer, and M. A. McCready (2001), SuperDARN convection and Sondrestrom plasma drift, Ann. Geophys., 19, 749-759, doi:10.5194/angeo-19-749-2001. (Pubitemid 33705431)
97. Yeh, H.-C, J. C. Foster, F. J. Rich, and W. Swider (1991), Storm time electric field penetration observed at midlatitude, J. Geophys. Res., 96 (A4), 5707-5721, doi:10.1029/90JA02751.
98. Yeoman, T. K., D. M. Wright, A. J. Stocker, and T. B. Jones (2001), An evaluation of range accuracy in the Super Dual Auroral Radar Network over-the-horizon HF radar systems, Radio Sci., 36(4), 801-813, doi:10.1029/2000RS002558. (Pubitemid 32813749)