Instrumental characteristics of the Electron Spectrum Analyzer (ESA) onboard the Planet-B mission and observational perspectives of the electron measurements
© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 1998
Received: 26 September 1997
Accepted: 12 January 1998
Published: 6 June 2014
An Electron Spectrum Analyzer (ESA) onboard the Planet-B mission to the planet Mars will measure the electron energy flux in the range of 12 eV to 15 keV in 32 energy steps. The sensor is essentially a toroidal top-hat electrostatic analyzer mounted on the surface of the spacecraft, which has a spin period of nominally 8 sec. With a 4° × 180° view angle and its spinal motion, the sensor can measure three-dimensional electron velocity distribution functions. Such distribution functions will be taken mostly during the perigee path with a high bit rate burst mode. In a nominal low bit rate mode, the reduced distribution data in the pitch-angle and energy phase space will be recorded and transmitted to Earth together with the burst mode data.
This electron measurement will provide significant information for studies on the structure of the magnetosphere and ionosphere as well as information on particle acceleration and the wave-particle interaction processes around Mars.