2003 Mars Report from Cooperative Observation Networks. II. After the Opposition

Details 2003 Mars Report from Cooperative Observation Networks. II. After the Opposition 2003 Mars Report from Cooperative Observation Networks. II. After the Opposition

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasj...57..497n&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.57, No.3, pp. 497-506

Astronomy and Astrophysics

Astronomy

Astronomical Data Bases: Miscellaneous, Methods: Observational, Planet And Satellites: Individual (Mars), Sociology Of Astronomy, Techniques: Image Processing

Scientific paper

This is the second report on Mars in 2003 by two networks for cooperative Mars observations in Japan: Nishi-Harima Astronomical Observatory Mars Cooperative Observation and Association of Lunar and Planetary Observers in Japan. This paper is a summary of 4145 data for 226 nights collected by the two networks during the second half of the last apparition from 2003 September 1 through 2004 June 22, corresponding to a period of Ls ˜ 252°--51° (Ls is the areocentric longitude of the Sun). During this period, many interesting phenomena were observed: (1) Albedo features did not show a large difference from the first half of the period. (2) Blue clearings due to the opposition effect and due to the cloud effect were, respectively, observed. (3) South polar cap (SPC) recession was usual. The recession rate in ˜ 210°--270°W increased and that in ˜ 30°--60°W decreased after Ls ˜ 230°. (4) North polar hood (NPH) had a topography-synchronous wave structure with a wave number = 1. (5) Many water ice clouds (WICs) were observed. Some particular regions frequently had prominent WICs. Some of them were related to topography. (6) Dust storm ``2003c'' was detected on December 9 (Ls = 314°) in Chryse. The storm grew rapidly to a very large dimension in the southern mid-latitudes, encircling over half of Mars. Another dust core occurred on December 23 around Aurorae Sinus. (7) Another dust storm is suspected in Ls = 20° over the south polar region.

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