[Sis-csi] Dust impact?

[Donald P Olsen]

Greetings

Any dust, in addition of refraction, could also cause scattering 
dependeing on its surface electrical conductivity at the operating 
frequencies.

Don





"Scott, Keith L." <kscott at mitre.org> 
Sent by: sis-csi-bounces at mailman.ccsds.org
10/27/2005 06:47 AM

To
"Fred Slane" <fas1 at adelphia.net>, <sis-csi at mailman.ccsds.org>
cc

Subject
RE: [Sis-csi] Dust impact?






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
 
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