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2003 Mars report from cooperative observation networks. II. After the opposition

机译：合作观测网络发布的2003年火星报告。二。反对派之后

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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 L-s similar to 252 degrees-51 degrees (L, 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 similar to 210 degrees-270 degrees W increased and that in similar to 30 degrees-60 degrees W decreased after Ls similar to 230 degrees. (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 (L-s = 314 degrees') 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 L-s = 20 degrees over the south polar region.
机译：这是2003年由日本的两个火星合作观测网络组成的第二份火星报告：Nishi-Harima天文观测台火星合作观测以及日本月球和行星观测器协会。本文总结了从2003年9月1日至2004年6月22日，在最后一次幻影的后半段，两个网络在226个晚上收集的4145个数据，对应的Ls周期类似于252度至51度（L，太阳的等距经度）。在此期间，观察到了许多有趣的现象：（1）反照率特征与该时期的前半段没有太大的差异。 （2）分别观察到由于对立效应和由于云效应引起的蓝色清除。 （3）南极帽（SPC）衰退很常见。在Ls接近230度之后，类似于210度至270度W的衰退率增加，而类似于30度60度时的衰退率降低。 （4）北极罩（NPH）具有波数= 1的地形同步波结构。（5）观察到许多水冰云（WIC）。一些特定区域经常有著名的WIC。其中一些与地形有关。 （6）12月9日在Chryse发现了“ 2003c”沙尘暴（L-s = 314度）。风暴在火星的一半以上的南部中纬度迅速扩大到很大的范围。 12月23日，另一个极核发生在极光窦附近。 （7）怀疑在南极地区L-s = 20度时发生另一场沙尘暴。

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