KMAG

Korea Pathfinder Lunar Orbiter

Magnetometer

KPLO: Korea Pathfinder Lunar Orbiter

KMAG: Kplo MAGnetometer (Scientific & Technical Demonstration instrument)

KPLO is the first lunar exploration mission in Korea. It is scheduled for launch in 2020 and its mission life will be 1 year. KMAG is one of the instruments on KPLO. KMAG will measure DC and low-frequency magnetic field variations near the lunar surface and provide a 3-D map of lunar magnetic fields. Due to the very limited available volume and mass on the spacecraft, we have adopted the multi-sensor technique to subtract the spacecraft interference field from observational data. Three triaxial fluxgate magnetometers are installed on a 1.2-meter-long boom. Two magnetometers are located at the end of the boom and one is located near the spacecraft-end of boom.

KPLO design (2018. March)

Operation concept

KMAG operation has two modes, which are boom deployment and normal operation. In boom deployment mode, the boom will be deployed. Deployment will take place after all deployable modules such as solar panels and antennas have been released. In normal mode, KMAG will operate with a 100 % duty cycle in the nominal mission phase (100 ±30 km altitude) and possibly during an extended phase (< 70 km altitude) after a 1-year period. The measurement campaign will continue until KPLO impacts the surface of the Moon. To better characterize spacecraft fields, we will also consider measuring fields while the boom is stowed (TBD).

Scientific expectations

To understand the geologic processes that led to the formation of crustal magnetism and lunar swirls

To understand the type of dynamo that magnetized crustal materials

To understand the ancient dipole axis of the lunar dynamo and the origin of the widely scattered paleopoles from crustal magnetic anomalies

KMAG instruments

Three triaxial fluxgate magnetometers, boom mounted (boom length 1.2 m)

Sampling rate: 10Hz

Resolution: < 0.2nT ( ~ 50 pT/√Hz: ) TBD

Dynamic rage: ± 1000 nT

Magnetic cleanness: < 700 nT at the spacecraft- of the boom.

  • Use Multi sensor-Technique due to limited boom length.

Contact Info.

khusat@khu.ac.kr