Remote Magnetometry With Mesospheric Sodium Based on Gated Photon Counting
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS(2019)
摘要
Remote detection of geomagnetic fields in the mesosphere would provide a powerful tool for mapping and interpreting Earth's lithospheric magnetic fields, monitoring magnetic disturbances in conjunction with the aurora, and making long-term measurements of ionospheric currents at polar regions. Based on gated photon counting and direct frequency sweep, a remote magnetometry scheme with precession of mesospheric sodium was demonstrated. The technique of gated photon counting has an advantage in background light suppression and has the potential to achieve altitude-resolved magnetic field measurements with an optimized laser source. An intensity-modulated laser beam was utilized to optically pump sodium atoms in the mesopause, and a ground-based telescope collects fluorescent echoes to infer the magnetic field. The experiment was carried out at Lijiang observatory where we validated this technique and measured the geomagnetic field with a sensitivity of 849 nT/Hz(1/2), which can be improved through further optimization.
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关键词
remote magnetometry,mesosphere,sodium layer,gated photon counting,ground magnetometer
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