SOSMAG
SOSMAG - Service Oriented Spacecraft Magnetometer on GEO-KOMPSAT-2A
SOSMAG data is provided as part of the SWE Service Network’s General Data Services
Access it via the SWE Data Browser or through HAPI
The InstrumentSOSMAG is the first Space Weather instrument flying as part of ESA’s Distributed Space Weather Sensor System (D3S). It is included in the Korean Space Environment Monitor (KSEM) installed on the Korean GEO-KOMPSAT-2A satellite, that launched in December 2018 and is now located in GEO at 128° East. SOSMAG measures the magnetic field continuously with a maximum vector rate of 128 vectors per second at all four sensors. Within the Data Processing Unit (DPU), the magnetic field data is filtered and decimated by a commandable integer factor, typically it is reduced to 1 vector per second. In addition, a cleaned vector is calculated as a linear combination of the measurements from all sensors. The data from the magnetic sensors are multiplied with a 3x3 calibration matrix and corrected for a static offset value before the cleaned vector is processed. Detailed information about the SOSMAG instrument and the used data cleaning method can be found in: The DataData is given as 3-axis vector of magnetic field (B) in nT in HPEN (north pole, east, nadir) and GSE (geocentric solar ecliptic) coordinates, together with UTC time stamps and satellite position in GSE. Data from SOSMAG is available in three different flavors with different delays and calibration qualities.
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Figure 1, Illustration of ESA’s Distributed Space Weather Sensor System concept planned to be realized through hosted payload missions as well as dedicated small satellite missions. Figure 2, GK-2A spacecraft during a pre-launch test campaign. The stowed SOSMAG boom with the two fluxgate sensors is indicated with a dotted rectangle. The approximate mounting position of the two AMR sensors within the spacecraft is shown by two white dots. The AMR 1 sensor is located near the +X/+Y corner of the spacecraft and the AMR 2 is mounted close to the +X side wall next to the launch lock of the boom. Figure 3, Picture of the SOSMAG qualification model with a) electronics box, b) boom with carbon fibre based interface plate, c) two fluxgate sensors mounted onto the boom and d) two anisotropic magnetoresistance sensors. |