[Sis-csi] Dust impact?

[Scott, Keith L.]

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?
 
        --keith

________________________________

	From: sis-csi-bounces at mailman.ccsds.org
[mailto:sis-csi-bounces at mailman.ccsds.org] On Behalf Of Fred Slane
	Sent: Wednesday, October 26, 2005 9:36 AM
	To: sis-csi at mailman.ccsds.org
	Subject: RE: [Sis-csi] Dust impact?
	
	
	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).
	 
	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.
	 
	Cheers,
	Fred
	 
	Frederick A. Slane
	President
	Space Infrastructure, Inc.
	1219 North 31st Street
	Colorado Springs, CO 80904
	(719) 634-3194
	freds at spacestandards.com
	www.spacestandards.com
	 
	-----Original Message-----
	From: sis-csi-bounces at mailman.ccsds.org
[mailto:sis-csi-bounces at mailman.ccsds.org] On Behalf Of Kearney, Mike
	Sent: Wednesday, October 19, 2005 4:53 PM
	To: sis-csi at mailman.ccsds.org
	Subject: RE: [Sis-csi] Telecon tomorrow
	 
	This is the drawing that Keith was talking about.  
	 
	A few comments:
	 
	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.
	 
	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.  
	 
	 
	   -=- Mike
	 
	Mike Kearney
	NASA MSFC EO-01
	256-544-2029
	
________________________________

	From: sis-csi-bounces at mailman.ccsds.org
[mailto:sis-csi-bounces at mailman.ccsds.org] On Behalf Of Scott, Keith L.
	Sent: Wednesday, October 19, 2005 4:41 PM
	To: sis-csi at mailman.ccsds.org
	Subject: [Sis-csi] Telecon tomorrow
	 
	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.
	 
	703.983.1550 x 55555
	 
	        --keith
	 
	 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ccsds.org/pipermail/sis-csi/attachments/20051027/7e889c3e/attachment.html