Long-term atmospheric variability on Uranus and Neptune

Icarus

Volumn 186, Issue 1, 2007, Pages 291-301

  Hammel, H B ^a   Lockwood, G W ^b  

^a Center for Exoplanetary Systems   (United States)

^b LOWELL OBSERVATORY   (United States)

Author keywords

atmosphere; Neptune; Photometry; Uranus

Indexed keywords

EID: 33845262853     PISSN: 00191035     EISSN: 10902643     Source Type: Journal    
DOI: 10.1016/j.icarus.2006.08.027     Document Type: Article

References (66)

1. Alexander A. The Planet Uranus (1965), Faber & Faber, London
2. Baines K.H., and Smith W.H. The atmospheric structure and dynamical properties of Neptune derived from ground-based and IUE spectroscopy. Icarus 85 (1990) 65-108
3. Baron R.L., French R.G., and Elliot J.L. The oblateness of Uranus at the 1-μbar level. Icarus 78 (1989) 119-130
4. Bézard B., Romani P.N., Feuchtgruber H., and Encrenaz T. Detection of the methyl radical on Neptune. Astrophys. J. 515 (1999) 868-872
5. Belton, M.J.S., Terrile, R.J., 1984, Rotational properties of Uranus and Neptune. In: Uranus and Neptune, NASA CP-2330, pp. 327-347
6. Belton M.J.S., Wallace L., and Howard S. The periods of Neptune: Evidence for atmospheric motions. Icarus 46 (1981) 263-274
7. Brown R.H., Cruikshank D.P., and Tokunaga A.T. The rotation period of Neptune's upper atmosphere. Icarus 47 (1981) 159-165
8. Conrath B.J., Gierasch P.J., and Leroy S.S. Temperature and circulation in the stratosphere of the outer planets. Icarus 83 (1990) 255-281
9. Cruikshank D.P. On the rotation period of Neptune. Astrophys. J. 220 (1978) L57-L59
10. Cruikshank D.P. Variability of Neptune. Icarus 64 (1985) 107-111
11. de Pater I., Gibbard S., Chiang E., Hammel H.B., Macintosh B., Marchis F., Martin S., Roe H.G., and Showalter M. The dynamic neptunian ring arcs: Gradual disappearance of Liberté and a resonant jump of Courage. Icarus 174 (2005) 263-272
12. Friedson A.J., and Ingersoll A.P. Seasonal meridional energy balance and thermal structure of the atmosphere of Uranus: A radiative-convective-dynamical model. Icarus 69 (1987) 135-156
13. Gibbard S.G., Roe H.G., de Pater I., Macintosh B.A., Gavel D.T., Max C.E., Baines K.H., and Ghez A.M. High-resolution infrared imaging of Neptune from the Keck Telescope. Icarus 156 (2002) 1-15
14. Gibbard S.G., de Pater I., and Hammel H.B. Near-infrared adaptive optics imaging of the satellites and individual rings of Uranus from the W.M. Keck Observatory. Icarus 174 (2005) 253-262
15. Hammel H.B. Discrete cloud structure on Neptune. Icarus 80 (1989) 14-22
16. Hammel H.B., and Buie M.W. An atmospheric rotation period of Neptune determined from methane-band imaging. Icarus 72 (1987) 62-68
17. Hammel H.B., and Lockwood G.W. Atmospheric structure of Neptune in 1994, 1995, and 1996: HST imaging at multiple wavelengths. Icarus 129 (1997) 466-481
18. Hammel H.B., Lark N.L., Rigler M., and Kreidel T.J. Disk-integrated photometry of Neptune at methane-band and continuum wavelengths. Icarus 79 (1989) 1-14
19. Hammel H.B., Lawson S.L., Harrington J., Lockwood G.W., Thompson D.T., and Swift C. An atmospheric outburst on Neptune from 1986 through 1989. Icarus 99 (1992) 363-367
20. Hammel, H.B., Lebeau, R.P., Lawson, S.L., 1993. Oral presentation at the 1993 DPS Meeting in Boulder, CO
21. Hammel H.B., Lockwood G.W., Mills J.R., and Barnet C.D. Hubble Space Telescope imaging of Neptune's cloud structure in 1994. Science 268 (1995) 1740
22. Hammel H.B., Rages K., and Lockwood G.W. Observations of Neptune in 2000 and 2001. Bull. Am. Astron. Soc. 33 (2001) 1403-1404
23. Hammel H.B., de Pater I., Gibbard S.G., Lockwood G.W., and Rages K. New cloud activity on Uranus in 2004: First detection of a southern feature at 2.2 microns. Icarus 175 (2005) 284-288
24. Hammel H.B., Rages K., Lockwood G.W., De Pater I., and Gibbard S.G. Uranus in 2003: Zonal winds, banded structure, and discrete features. Icarus 175 (2005) 534-545
25. Hammel H.B., Lynch D.K., Russell R.W., Sitko M.L., Bernstein L.S., and Hewagama T. Mid-infrared ethane emission on Neptune and Uranus. Astrophys. J. 644 (2006) 1326-1333
26. Heasley J.N., Pilcher C.B., Howell R.R., and Caldwell J.J. Restored methane-band images of Uranus and Neptune. Icarus 57 (1984) 432-442
27. Hofstadter M.D., and Butler B.J. Seasonal change in the deep atmosphere of Uranus. Icarus 165 (2003) 168-180
28. Joyce R.R., Pilcher C.B., Cruikshank D.P., and Morrison D. Evidence for weather on Neptune. I. Astrophys. J. 214 (1977) 657-662
29. Karkoschka E. Uranus' apparent seasonal variability in 25 HST filters. Icarus 151 (2001) 84-92
30. Klein M.J., Hofstadter M.D., Hammel H.B., Leflang J.G., Roller J.P., and McLeod R.K. Long-term variations in the microwave brightness temperature of the Uranus atmosphere. Bull. Am. Astron. Soc. 34 (2002) 874
31. Klein M.J., Hofstadter M.D., Hammel H.B., Leflang J.G., Roller J.P., and McLeod R.K. Seasonal changes in the microwave brightness temperature of the Uranus atmosphere. Bull. Am. Astron. Soc. 34 (2003) 1173
32. Klein M.J., and Hofstadter M.D. Long-term variations in the microwave brightness temperature of the Uranus atmosphere. Icarus 184 (2006) 170-180
33. Lindal G.F., Lyons J.R., Sweetnam D.N., Eshleman V.R., Hinson D.P., and Tyler G.L. The atmosphere of Uranus: Results of radio occultation measurements with Voyager 2. J. Geophys. Res. 92 (1987) 14987-15001
34. Lockwood, G.W., 2000. A case study illustrating the practical limitations of precision photoelectric photometry. In: Borucki, W.J., Lasher, L.E. (Eds.), Third Workshop on Photometry, NASA/CP-2000-209614, pp. 9-23
35. Lockwood G.W., and Jerzykewicz M. Photometric variability of Uranus and Neptune, 1950-2004: Implications for seasonal models. Icarus 180 (2006) 442-452
36. Lockwood G.W., and Thompson D.T. A relationship between solar activity and planetary albedos. Nature 280 (1979) 43-45
37. Lockwood G.W., and Thompson D.T. Long-term brightness variations of Neptune and the solar cycle modulation of its albedo. Science 234 (1986) 1543-1545
38. Lockwood G.W., and Thompson D.T. Solar cycle relationship clouded by Neptune's sustained brightness maximum. Nature 349 (1991) 593-594
39. Lockwood G.W., and Thompson D.T. Photometric variability of Uranus, 1972-1996. Icarus 137 (1999) 2-12
40. Lockwood G.W., and Thompson D.T. Photometric variability of Neptune, 1972-2000. Icarus 156 (2002) 37-51
41. Lockwood G.W., Thompson D.T., Hammel H.B., Birch P., and Candy M. Neptune's cloud structure in 1989: Photometric variations and correlation with ground-based images. Icarus 90 (1991) 299-307
42. Lockwood G.W., Skiff B.A., and Radick R.R. The photometric variation of sunlike stars: Observations and results, 1984-1995. Astrophys. J. 485 (1997) 789-811
43. Lorenz R.D., Lemmon M.T., Smith P.H., and Lockwood G.W. Seasonal change on Titan observed with the Hubble Space Telescope WFPC-2. Icarus 142 (1999) 391-401
44. Marten A., Matthews H.E., Owen T., Moreno R., Hidayat T., and Biraud Y. Improved constraints on Neptune's atmosphere from submillimetre-wavelength observations. Astron. Astrophys. 429 (2005) 1097-1105
45. Martin S.C., Roe H., de Pater I., Macintosh B.A., Gibbard S.G., Max C.E., Gavel D., Brown M., and Ghez A. The evolution of cloud features on Neptune over a 20-day time period. Bull. Am. Astron. Soc. 32 (2000) 1009
46. Martin S.C., de Pater I., Gibbard S.G., Macintosh B.A., Roe H.G., and Max C.E. The motions and morphologies of cloud features on Neptune: Continued monitoring with Keck Adaptive Optics. Bull. Am. Astron. Soc. 34 (2002) 858
47. Max C.E., Macintosh B.A., Gibbard S.G., Gavel D.T., Roe H.G., de Pater I., Ghez A.M., Acton D.S., Lai O., Stomski P., and Wizinowich P.L. Cloud structures on Neptune observed with Keck Telescope Adaptive Optics. Astron. J. 125 (2003) 364-375
48. Moses J.A., Allen M., and Yung Y.L. Neptune's visual albedo variations over a solar cycle: A pre-Voyager look at ion-induced nucleation and cloud formation in Neptune's troposphere. J. Geophys. Res. 16 (1989) 1489-1492
49. Pilcher C.B. Evidence for weather on Neptune. II. Astrophys. J. 214 (1977) 663-666
50. Rages K.A., Hammel H.B., and Lockwood G.W. A prominent apparition of Neptune's south polar feature. Icarus 159 (2002) 262-265
51. Rages K.A., Hammel H.B., and Friedson A.J. Evidence for temporal change at Uranus' south pole. Icarus 172 (2004) 548-554
52. Roberts Jr. L.C., and Neyman C.R. Characterization of the AEOS adaptive optics system. Publ. Astron. Soc. Pacific 114 (2002) 1260-1266
53. Roddier F., Roddier C., Brahic A., Dumas C., Graves J.E., Northcott M.J., and Owen T. First ground-based adaptive optics observations of Neptune and Proteus. Planet. Space Sci. 45 (1997) 1031-1036
54. Roques F., and 16 colleagues. Neptune's upper stratosphere, 1983-1990: Ground-based stellar occultation observations. III. Temperature profiles. Astron. Astrophys. 288 (1994) 985-1011
55. Slavsky D.B., and Smith H.J. The rotation period of Neptune. Astrophys. J. 226 (1978) L49-L52
56. Smith B.A., Reitsema H.J., and Larson S.M. Discrete cloud features on Neptune. Bull. Am. Astron. Soc. 11 (1979) 570
57. Smith B.A., and 64 colleagues. Voyager 2 at Neptune: Imaging science results. Science 246 (1989) 1422-1449
58. Sromovsky L.A., Limaye S.S., and Fry P.M. Clouds and circulation on Neptune: Implications of 1991 HST observations. Icarus 118 (1995) 25-38
59. Sromovsky L.A., Fry P.M., Baines K.H., and Dowling T.E. Coordinated 1996 HST and IRTF imaging of Neptune and Triton. II. Implications of disk-integrated photometry. Icarus 149 (2001) 435-458
60. Sromovsky L.A., Fry P.M., Dowling T.E., Baines K.H., and Limaye S.S. Coordinated 1996 HST and IRTF imaging of Neptune and Triton. III. Neptune's atmospheric circulation and cloud structure. Icarus 149 (2001) 459-488
61. Sromovsky L.A., Fry P.M., Dowling T.E., Baines K.H., and Limaye S.S. Neptune's atmospheric circulation and cloud morphology: Changes revealed by 1998 HST imaging. Icarus 150 (2001) 244-260
62. Sromovsky L.A., Fry P.M., Limaye S.S., and Baines K.H. The nature of Neptune's increasing brightness: Evidence for a seasonal response. Icarus 163 (2003) 256-261
63. Terrile R.J., and Smith B.A. The rotation rate of Neptune from ground-based CCD imaging. Bull. Am. Astron. Soc. 15 (1983) 858
64. Wallace L. The seasonal variation of the thermal structure of the atmosphere of Uranus. Icarus 54 (1983) 110-132
65. Wizinowich P., and 17 colleagues. First light adaptive optics images from the Keck II Telescope: A new era of high angular resolution imagery. Publ. Astron. Soc. Pacific 112 (2000) 315-319
66. Young L.A., Bosh A.S., Buie M., Elliot J.L., and Wasserman L.H. Uranus after solstice: Results from the 1998 November 6 occultation. Icarus 153 (2001) 236-247