<br><font size=2 face="sans-serif">Greetings</font>
<br>
<br><font size=2 face="sans-serif">Any dust, in addition of refraction,
could also cause scattering dependeing on its surface electrical conductivity
at the operating frequencies.</font>
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<br><font size=2 face="sans-serif">Don</font>
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<td width=40%><font size=1 face="sans-serif"><b>"Scott, Keith L."
<kscott@mitre.org></b> </font>
<br><font size=1 face="sans-serif">Sent by: sis-csi-bounces@mailman.ccsds.org</font>
<p><font size=1 face="sans-serif">10/27/2005 06:47 AM</font>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td valign=top><font size=1 face="sans-serif">"Fred Slane" <fas1@adelphia.net>,
<sis-csi@mailman.ccsds.org></font>
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<div align=right><font size=1 face="sans-serif">cc</font></div>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td valign=top><font size=1 face="sans-serif">RE: [Sis-csi] Dust impact?</font></table>
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<br><font size=2 color=blue face="Arial">Hmm. Any notion of what
such dust would do to a Ka-band or X-band signal? If it changed the
permittivity of the atmosphere significantly I guess it could refract or
attenuate a signal. Presumably the effects of 'free' (didn't want
to say airborne) dust on the moon would be relatively short-lived unless
it happened to coat an antenna. Mars has dust storms and those pesky
dust devils. ANy pointers to data?</font>
<br><font size=3> </font>
<br><font size=3> </font><font size=2 color=blue face="Arial">--keith</font>
<br>
<br>
<hr><font size=2 face="Tahoma"><b>From:</b> sis-csi-bounces@mailman.ccsds.org
[mailto:sis-csi-bounces@mailman.ccsds.org] <b>On Behalf Of </b>Fred Slane<b><br>
Sent:</b> Wednesday, October 26, 2005 9:36 AM<b><br>
To:</b> sis-csi@mailman.ccsds.org<b><br>
Subject:</b> RE: [Sis-csi] Dust impact?</font><font size=3><br>
</font>
<p><font size=2 color=#000080 face="Arial">Mike raises the point of lunar
dust. Our investigations under Project DUST indicate the “dusty
plasma” on the Moon will be a significant contributor to work on and near
there. There are also data to suggest similar, but not the same, effects
on Mars. Our investigation started looking at simple geophysical
and geochemical properties and implications of dust. We have assembled
a good information base which needs to find its way to others (such as
the space communications crowd).</font>
<p><font size=2 color=#000080 face="Arial"> </font>
<p><font size=2 color=#000080 face="Arial">We have initiated standards
development in the ISO TC20/SC14 Space Environments Working Group on dust,
dust simulants and extensions of space environment models to local operational
scales on the Moon and at Mars.</font>
<p><font size=2 color=#000080 face="Arial"> </font>
<p><font size=2 color=#000080 face="Arial">Cheers,</font>
<br><font size=4 color=#000080 face="Monotype Corsiva"><b>Fred</b></font>
<br><font size=3 color=#000080 face="Times New Roman"> </font>
<br><font size=3 color=#000080 face="Arial">Frederick A. Slane</font>
<br><font size=3 color=#000080 face="Arial">President</font>
<br><font size=3 color=#000080 face="Arial">Space Infrastructure, Inc.</font>
<br><font size=3 color=#000080 face="Arial">1219 North 31st Street</font>
<br><font size=3 color=#000080 face="Arial">Colorado Springs, CO 80904</font>
<br><font size=3 color=#000080 face="Arial">(719) 634-3194</font>
<br><font size=3 color=#000080 face="Arial">freds@spacestandards.com</font>
<br><font size=3 color=#000080 face="Arial">www.spacestandards.com</font>
<p><font size=2 color=#000080 face="Arial"> </font>
<p><font size=2 face="Tahoma">-----Original Message-----<b><br>
From:</b> sis-csi-bounces@mailman.ccsds.org [mailto:sis-csi-bounces@mailman.ccsds.org]
<b>On Behalf Of </b>Kearney, Mike<b><br>
Sent:</b> Wednesday, October 19, 2005 4:53 PM<b><br>
To:</b> sis-csi@mailman.ccsds.org<b><br>
Subject:</b> RE: [Sis-csi] Telecon tomorrow</font>
<p><font size=3 face="Times New Roman"> </font>
<p><font size=2 color=#000080 face="Arial">This is the drawing that Keith
was talking about. </font>
<p><font size=2 color=#000080 face="Arial"> </font>
<p><font size=2 color=#000080 face="Arial">A few comments:</font>
<p><font size=2 color=#000080 face="Arial"> </font>
<p><font size=2 color=#000080 face="Arial">This gives one the impression
that RTT is the only defining boundary on Cislunar space. There are
other characteristics for lunar programs besides RTT, so RTT should not
be the only defining parameter. Others could be lunar dust, mountain/crater
rim blockage, a certain pattern of AOS/LOS, Need to explain in the text
in the scope section that for this particular parameter, RTT, a 10 sec.
RTT was chosen as the limit that our solutions work for, and Cislunar solutions
should work in other environments (Mars Local) for mission spaces within
10 sec. RTT.</font>
<p><font size=2 color=#000080 face="Arial"> </font>
<p><font size=2 color=#000080 face="Arial">Another open question… Should
the Mars Cislunar range go out to Sun-Mars L2? For a comm satellite
that covers the Martian far side? I assume that since Mars is lower
mass than earth, SML2 is closer to Mars than SEL2. But not being
a celestial mechanic, I’m not sure. If we feel lucky, we could put
SML2 inside the Mars blue circle, and if we’re wrong, or irrelevant, I’m
sure someone would tell us. </font>
<p><font size=2 color=#000080 face="Arial"> </font>
<p><font size=2 color=#000080 face="Arial"> </font>
<p><font size=2 color=#000080 face="Arial"> -=- Mike</font>
<p><font size=2 color=#000080 face="Arial"> </font>
<p><font size=2 color=#000080 face="Arial">Mike Kearney</font>
<p><font size=2 color=#000080 face="Arial">NASA MSFC EO-01</font>
<p><font size=2 color=#000080 face="Arial">256-544-2029</font>
<div align=center>
<p>
<hr></div>
<p><font size=2 face="Tahoma"><b>From:</b> sis-csi-bounces@mailman.ccsds.org
[mailto:sis-csi-bounces@mailman.ccsds.org] <b>On Behalf Of </b>Scott, Keith
L.<b><br>
Sent:</b> Wednesday, October 19, 2005 4:41 PM<b><br>
To:</b> sis-csi@mailman.ccsds.org<b><br>
Subject:</b> [Sis-csi] Telecon tomorrow</font>
<p><font size=3 face="Times New Roman"> </font>
<p><font size=2 face="Arial">Let's have a short telecon tomorrow. I'd
like to get a feel for any feedback we've gotten and talk about Mike's
new scope picture and how to start wrapping this up.</font>
<p><font size=3 face="Times New Roman"> </font>
<p><font size=2 face="Arial">703.983.1550 x 55555</font>
<p><font size=3 face="Times New Roman"> </font>
<p><font size=3 face="Times New Roman"> </font><font size=2 face="Arial">--keith</font>
<p><font size=3 face="Times New Roman"> </font>
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<p>