The nature of Neptune's increasing brightness: evidence for a seasonal response *

Details The nature of Neptune's increasing brightness: evidence for a seasonal response * The nature of Neptune's increasing brightness: evidence for a seasonal response *

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icar..163..256s&link_type=abstract

Icarus, Volume 163, Issue 1, p. 256-261.

Physics

10

Scientific paper

Hubble Space Telescope (HST) observations in August 2002 show that Neptune's disk-averaged reflectivity increased significantly since 1996, by 3.2 +/- 0.3% at 467 nm, 5.6 +/- 0.6% at 673 nm, and 40 +/- 4% in the 850-1000 nm band, which mainly results from dramatic brightness increases in restricted latitude bands. When 467-nm HST observations from 1994 to 2002 are added to the 472-nm ground-based results of Lockwood and Thompson (2002, Icarus 56, 37-51), the combined disk-averaged variation from 1972 to 2002 is consistent with a simple seasonal model having a hemispheric response delay relative to solar forcing of ~30 years (~73% of a full season).

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