This paper reports on the design and installation of a thermostat to keep the temperature of the fluxgate magnetometer constant and the data stability evaluation after installation. The thermostat was installed at the Icheon Geomagnetic Observatory operated by the Korean Space Weather Center of National Radio Research Agency. It was designed in consideration of stability of temperature control against safety incident, potential effects on magnetic field measurement, and the temperature control efficiency. After the temperature control device was installed, it was confirmed that the temperature was constantly maintained at the level of 20℃. Delta F and baseline values were used to evaluate geomagnetic data stability, and it was confirmed that delta F and baseline fluctuations were reduced after installation of the thermostat.
The Ionospheric Anomaly Monitoring by Magnetometer And Plasma-probe (IAMMAP) is
one of the scientific instruments for the Compact Advanced Satellite 500-3 (CAS 500-3)
which is planned to be launched by Korean Space Launch Vehicle in 2024. The main
scientific objective of IAMMAP is to understand the complicated correlation between the
equatorial electro-jet (EEJ) and the equatorial ionization anomaly (EIA) which play
important roles in the dynamics of the ionospheric plasma in the dayside equator region.
IAMMAP consists of an impedance probe (IP) for precise plasma measurement and
magnetometers for EEJ current estimation. The designated sun-synchronous orbit along the
quasi-meridional plane makes the instrument suitable for studying the EIA and EEJ. The
newly-devised IP is expected to obtain the electron density of the ionosphere with
unprecedented precision by measuring the upper-hybrid frequency (fUHR) of the
ionospheric plasma, which is not affected by the satellite geometry, the spacecraft
potential, or contamination unlike conventional Langmuir probes. A set of
temperaturetolerant precision fluxgate magnetometers, called Adaptive In-phase
MAGnetometer, is employed also for studying the complicated current system in the
ionosphere and magnetosphere, which is particularly related with the EEJ caused by the
potential difference along the zonal direction.
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