Mars: Dissipating Behavior of the Cloud Belt

Details Mars: Dissipating Behavior of the Cloud Belt Mars: Dissipating Behavior of the Cloud Belt

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasj...54l..31n&link_type=abstract

Publications of the Astronomical Society of Japan, vol.54, no. 3, p. L31-L34.

Astronomy and Astrophysics

Astronomy

2

Earth, Planets And Satellites: Individual (Mars), Ultraviolet: Solar System

Scientific paper

This is a brief report on the Martian climate, based on our observations in 2001 as well as those in 1997 and 1999. The focus is the dissipating behavior of the low-latitude cloud belt appearing around the aphelion, the behavior of which has never been explicitly examined. We derive the optical thickness of water ice clouds (WICs) as τWIC ≈ 0.1 (λ ~= 4400 Å) at the solar longitude Ls = 174° in 2001. The latitudinal coverage of the cloud belt is approximately Ls-independent just until its end. The cloud belt divides into a ``semi-encircling'' cloud band and discrete WICs before its dissipation (over Ls ~ 100°-110°) in many cases. We suggest that this cloud division should embody localization of the cross-equatorial Hadley circulation.

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