The density structure of a solar polar coronal hole

Journal of Geophysical Research: Space Physics

Volumn 104, Issue A5, 1999, Pages 9781-9789

  Warren, H P ^a,c   Hassler, D M ^b  

^a NAVAL RESEARCH LABORATORY   (United States)

^b SOUTHWEST RESEARCH INSTITUTE   (United States)

^c HARVARD SMITHSONIAN CENTER FOR ASTROPHYSICS   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0038246148     PISSN: None     EISSN: 21699402     Source Type: Journal    
DOI: 10.1029/1998ja900079     Document Type: Article

References (38)

1. Arnaud, M., and R. Rothenflug, An updated evaluation of recombination and ionization rates, Astron. Astrophys., 60, 425-457, 1985.
2. Bhatia, A. K., and H. E. Mason, Theoretical atomic structure and electron scattering data for ions in the nitrogen isoelectronic sequence - Mg VI, Si VIII, S X, A XII, and Ca XIV, Mon. Not. R. Astron. Soc., 190, 925-929, 1980.
3. Brickhouse, N. S., and R. Esser, Effects of high ion temperature on spectral line diagnostics in the source region of the high speed solar wind, Astrophys. J., 479, 470-476, 1997.
4. Delaboudinière, J.-P., et al., EIT: Extreme-ultraviolet imaging telescope for the SOHO mission, Sol. Phys., 162, 291-312, 1995.
5. Dere, K. P., J.-D. F. Bartoe, G. E. Brueckner, and F. Recely, Transition zone flows observed in a coronal hole on the solar disk, Astrophys. J., 345, L95-L97, 1989.
6. Dere, K. P., E. Landi, H. E. Mason, B. C. M. Fossi, and P. R. Young, CHIANTI - An atomic database for emission lines. Paper I: Wavelengths greater than 50 Å, Astron. Astrophys. Suppl. Ser., 125, 149-173, 1997.
7. Doschek, G. A., U. Feldman, A. K. Bhatia, and H. E. Mason, Densities in the quiet Sun and polar coronal holes from euv line ratios involving O III 1666.15 Å, Astrophys. J., 226, 1129-1134, 1978.
8. Doschek, G. A., H. P. Warren, J. M. Laming, K. Wilhelm, P. Lemaire, U. Schühle, and T. G. Moran, Electron densities in the solar polar coronal holes from density sensitive line ratios of Si VIII and S X, Astrophys. J., 482, L109-L112, 1997.
9. Dosheck, G. A., Emission measures and electron densities for the solar transition region, Astrophys. J., 476, 903-917, 1997.
10. Dufton, P. L., and A. E. Kingston, Effective collision strengths for Si III, Mon. Not. R. Astron. Soc., 241, 209-214, 1989.
11. Dufton, P. L., A. Hibbert, A. E. Kingston, and G. A. Doschek, Si III line ratios in the Sun, Astrophys. J., 274, 420-428, 1983.
12. Dwivedi, B. N., and A. Mohan, On the electron densities in a coronal hole, Sol. Phys., 156, 197-199, 1995.
13. Feldman, U., G. A. Doschek, J. T. Mariska, A. K. Bhatia, and H. E. Mason, Electron densities in the solar corona from density-sensitive line rations in the N I isoelectron sequence, Astrophys. J., 226, 674-678, 1978.
14. Feldman, U., W. E. Behring, W. Curdt, U. Schühle, K. Wilhelm, and P. Lemaire, A coronal spectrum in the 500-1600 Å wavelength range at a height of 30″ above the solar limb by the SUMER instrument on SOHO, Astrophys. J. Suppl. Ser., 113, 195-219, 1997.
15. Geiss, J., et al., The southern high-speed stream - Results from the SWICS instrument on Ulysses, Science, 268, 1033-1035, 1995.
16. Hassler, D. M., G. J. Rottman, E. C. Shoub, and T. E. Holzer, Line broadening of Mg X 609 and 625 Å coronal emission lines observed above the solar limb, Astrophys. J., 348, L77-L80, 1990.
17. Judge, P. G., V. Hansteen, Ø. Wikstøl, K. Wilhelm, U. Schühle, and T. Moran, Evidence in support of the nanoflare picture of coronal heating from SUMER data, Astrophys. J., 502, 981-996, 1998.
18. Keenan, F. P., K. A. Berrington, P. G. Burke, A. E. Kingston, and P. L. Dufton, Level populations for Besequence ions in astrophysical plasmas, Mon. Not. R. Astron. Soc., 207, 459-463, 1984.
19. Kohl, J. L., L. Strachan, and L. D. Gardner, Measurement of hydrogen velocity distributions in the extended solar corona, Astrophys. J., 465, L141-L144, 1996.
20. Laming, J. M., U. Feldman, U. Schühle, P. Lemaire, W. Curdt, and K. Wilhelm, Electron density diagnostics for the solar upper atmosphere from spectra obtained by SUMER/SOHO, Astrophys. J., 485, 1997.
21. Lemaire, P., et al., First results of the SUMER telescope and spectrometer on SOHO: II. imagery and data management, Sol. Phys., 170, 105-122, 1997.
22. Mariska, J. T., The Solar Transition Region, vol. 23 of Cambridge Astrophys. Ser., Cambridge Univ. Press, New York, 1992.
23. Mariska, J. T., U. Feldman, and G. A. Doschek, Measurement of extreme-ultraviolet emission-line profiles near the solar limb, Astrophys. J., 226, 698-705, 1978.
24. McKenzie, J. F., M. Banaszkiewicz, and W. I. Axford, Acceleration of the high speed solar wind, Astron. Astrophys., 303, L45-L48, 1995.
25. Meyer, J.-P., Solar-stellar atmospheres and energetic particles, and galactic cosmic rays, Astrophys. J. Suppl. Ser., 57, 173-204, 1985.
26. Ofman, L., and J. M. Davila, Solar wind acceleration by solitary waves in coronal holes, Astrophys. J., 476, 357-365, 1997.
27. Phillips, J. L., et al., Ulysses solar wind plasma observations at high southerly latitudes, Science, 268, 1030-1033, 1995.
28. Seely, J. F., U. Feldman, U. Schuehle, K. Wilhelm, W. Curdt, and P. Lemaire, Turbulent velocities and ion temperatures in the solar corona obtained from SUMER line widths, Astrophys. J., 484, L87-L90, 1997.
29. Vernazza, J. E., and E. M. Reeves, Extreme ultraviolet composite spectra of representative solar features, Astrophys. J. Suppl. Ser., 37, 485-513, 1978.
30. Walker, A. B. C., C. E. Deforest, R. B. Hoover, and T. W. Barbee, Thermal and density structure of polar plumes, Sol. Phys., 148, 239-247, 1993.
31. Warren, H. P., J. T. Mariska, and K. Wilhelm, Observations of doppler shifts in a solar polar coronal hole, Astrophys. J., 490, L187-L190, 1997.
32. Widing, K. G., and U. Feldman, Element abundances and plasma properties in a coronal polar plume, Astrophys. J., 392, 715-721, 1992.
33. Wilhelm, K., et al., SUMER - Solar ultraviolet measurements of emitted radiation, Sol. Phys., 162, 189-231, 1995.
34. Wilhlem, K., et al., First results of the SUMER telescope and spectrometer on SOHO: I. Spectra and spectroradiometry, Sol. Phys., 170, 75-104, 1997.
35. Withbroe, G. L., The temperature structure, mass, and energy flow in the corona and inner solar wind, Astrophys. J., 325, 442-467, 1988.
36. Zhang, H. L., and D. H. Sampson, Relativistic distorted-wave collision strengths and oscillator strengths for the 45 Δn = 0 transitions with n = 2 in the 85 Be-like ions with 8 ≤ Z ≤ 92, Atomic Data Nucl. Data Tables, 52, 143-173, 1992.
37. Zhang, H. L., and D. H. Sampson, Relativistic distorted-wave collision strengths and oscillator strengths for the 105 Δn = 0 transitions with n = 2 in the 85 B-like ions with 8 ≤ Z ≤ 92, Atomic Data Nucl. Data Tables, 56, 41-104, 1994.
38. Zhang, H. L., M. Graziani, and A. K. Pradhan, Atomic data from the iron project. 3: Rate coefficients for electron impact excitation of boron-like ions: Ne VI, Mg VIII, Al IX, Si X, S XII, Ar XIV, Ca XVI and Fe XXII, Astron. Astrophys., 283, 319-330, 1994.