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|Authors: ||Honary, Farideh*|
Marple, Steve R.*
Hapgood, Mike A.*
|Title: ||Mars Riometer System|
|Issue Date: ||19-Apr-2009|
|Abstract: ||A riometer (relative ionospheric opacity meter) measures
the intensity of cosmic radio noise at the surface of a planet.
When an electromagnetic wave passes through the
ionosphere collisions between charged particles (usually
electrons) and neutral gases remove energy from the wave.
By measuring the received signal intensity at the planet's
surface and comparing it to the expected value (the quietday
curve) a riometer can deduce the absorption
(attenuation) of the trans-ionospheric signal. Thus the
absorption measurements provide an indication of ionisation
changes occurring in the ionosphere.
To avoid the need for orbiting sounders riometers use the
cosmic noise background as a signal source. Earth-based
systems are not subject to the challenging power, volume
and mass restriction that would apply to a riometer for
Mars. Some Earth-based riometers utilise phased-array
antennas in order to provide an imaging capability.|
|Appears in Collections:||Conference materials|
01.02.06. Instruments and techniques
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