LtE in CMO #274

From C Martin GASKELL

® . . . . . .Date: Tue, 1 July 2003 19:26:33 -0500 (CDT)

From: C Martin Gaskell <>



Subject: Mars


Hi Richard,


     last Friday morning (2003/6/27) at dawn here in Nebraska I was looking at Mars (CM = 337) and I noted in my sketchbook that there was slightly yellowish diffuse cloud S. of Mare Erythraeum towards Argyre.  The color was different from a whitish cloud over Chryse and the blue clouds/haze on the morning limb in the other (northern) hemisphere. Since the sun-angle between M. Erythraeum and Argyre was very favorable for dust scattering this might not be abnormal.  I saw something similar a week or two before the 2001 dust storm.  Compared to the 1988 opposition, overall contrast across the disk seemed to be down, but it was much better than in the summer of 2001.


     My sketch of the SPC on June 27 showed the brightest area to be very clearly around longitude 50, rather than S. of Hellas as in Don's image of this morning.


     It will be interesting to see what evolves over the next few days.


® . . . . . .Date: Wed, 2 July 2003 16:48:17 -0500 (CDT)

From: C Martin Gaskell <>

To: Donald Parker <>

Cc:,,,,,,,,,,,,,,,,,,,, mgaskell1@UNL.EDU,,,,,,,,,,,,

Subject: Mars July 2


I looked at Mars with a 16-inch SCT at 07:39 UT (about two hours before Don's images).  The Hellas region S. from -25 to -55 latitude was yellowish as it came round the morning limb from longitudes ~320 (on the limb) to around 260.


I also looked with an 8-inch Newtonian about an hour after Don's image (10h UT). The whole region S. of the equator at Syrtis Major was of low contrast until one got near the SPC.  Mare Tyrrhenum was lighter than Mare Serpentis.


The color of Aeria/Arabia particularly intrigued me, especially compared with Libya side of Syrtis Major.  Aeria/Arabia had noticeable orange yellow color while Libya was a blander color.  The difference seemed greater than normal.


® . . . . . .From: "C Martin Gaskell" <>

To: "Masami MURAKAMI" <>

Sent: Saturday, July 05, 2003 3:30 PM

Subject: Re: 2003News No1/ CMO


Thank you very much for your report.  I am following the developments whenever I can.


Best wishes,


® . . . . . .From: "C Martin Gaskell" <>

To: "Masami MURAKAMI" <>

Sent: Wednesday, July 09, 2003 7:11 AM

Subject: Re: Noachis Dust from 4 July to 7 July (CMO 2003 News #3) 


Thank you for your most interesting description.  I enjoyed your choice of words!



® . . . . . .Date: Wed, 9 July 2003 15:15:33 -0500 (CDT)

From: C Martin Gaskell <>

To: Donald Parker <>

Cc:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Michael Casey <>

Subject: Libya/Isidis vs. Aeria a week ago


I think this explains the color difference I commented on a week ago between Libya/Isidis on one side of Syrtis Major and Libya on the other side.  See:


This emphasises that we earth-bound visual types tend not to notice dust that doesn't obscure dark albedo features.

Martin GASKELL (Nebraska, USA)

Dept. Physics & Astronomy, Univ. Nebraska

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