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From trish@rodan.jpl.nasa.gov Tue Dec  2 15:32:28 1997
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Date: 02 Dec 97 15:36:33 -0800
From: Trish Priest <trish@rodan.jpl.nasa.gov>
Subject: RE: ingress timing
To: Dave Hinson <hinson@nimbus.Stanford.EDU>
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Status: RO

I also added one more selling point -- the distinct lack of occultations
during any proposed phasing orbit.

-Trish

Dave Hinson wrote:
>Trish,
>
>I agree -- let's plan to ask for -10 to +2 minutes and see how
>people react.  The exception is in late January, when the spacecraft
>is not yet occulted by Mars' surface.  Dick would like to see some
>data during these highly grazing occultations to look for scattering
>from the surface.  Best to check with him in formulating a strategy
>for collecting data.
>
>Your question about the turn-around time for profiles is a very good
>one.  Our ability to provide unique information to the Atmospheric
>Advisory Group is a strong selling point.  Once the raw data and SPK
>files are in our hands, data analysis should take no more than a few
>days initially, and less than one day after some practice.  This will
>be a challenge, however, because we're reducing our budgets for the
>current fiscal year so as to better stretch our funding into the delayed
>mapping phase.
>
>Here is the list of selling points, with some minor changes.
>
>Thanks,
>Dave
>
>------------------------
>
>1.  On the HGA, the RST would obtain high quality occultation data --
>approximately 100 times better than the data collected at MOI and 100
>times better than Viking data.
>
>2.  These data would be collected at Southern Summer over a wide range
>of latitudes (40 deg N to 65 deg S).  The data will provide a "snapshot"
>of the atmosphere during a single season.  Occultation latitude slews
>from 40 deg N to 65 deg S in about 40 days.
>
>3.  About 300 occultations would be observed in a period of 4 months.
>
>4.  The experiments would provide atmospheric data when the other
>instruments are turned off.  Information would be for a specific latitude
>that is generally not close to periapsis on the same orbit.  However, the
>measurements could detect substantial dust storms if they occur.
>
>5.  This series of experiments would put the Radio Science open-loop
>equipment, remote operations, and the support team through operations
>resembling mapping -- before our remote operations developer leaves JPL.