From: Milton Aupperle <milton@outcastsoft.com>

Date: October 23, 2005 12:27:11 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] stormy mars comparison image

Hi Alan;

Thanks for the reference and information on it. Interesting correlation between transparency in one area while another area is being obscured.

TTYL..

On 23-Oct-05, at 12:11 PM, Alan Friedman wrote:

Hi Milton -

See the following explanation posted to the mars observers ALPO group by Don

Parker.

best -

Alan

> The dark region is part of Mare Acidalium. The hood has been

getting more transparent, which is normal when large dust storms occur. The

appearance of albedo features through the hood supports Clyde Tombaugh's

theory that the North Polar Cap isn't present during N. winter but forms

when the NPH condenses near N. spring. We managed to get an image of this

in 1993, but this year the evidence is much more compelling. Also the MGS

has imaged a similar phenomenon for the SPC back in April. Best, Don <

Milton J. Aupperle

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