Second harmonic poloidal waves observed by Van Allen Probes in the dusk‐midnight sector Journal of Geophysical Research: Space Physics
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Thispaperpresentsobservationsofultralow-frequency(ULF)wavesfromVanAllenProbes. The event that generated the ULF waves occurred 2 days after a minor geomagnetic storm during a geomagnetically quiet time. Narrowband pulsations with a frequency of about 7 mHz with moderateamplitudeswereregisteredinthepremidnightsectorwhenProbeAwaspassingthroughanenhanced densityregionneargeosynchronousorbit.ProbeB,whichpassedthroughtheregionearlier,didnotdetect thenarrowbandpulsationsbutonlybroadbandnoise.Despitethesingle-spacecraftmeasurements,wewereabletodeterminevariouswaveproperties.Wefindthat(1)theobservedwavesareasecondharmonic poloidal mode propagating westward with an azimuthal wave number estimated to be ∼100; (2) the
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2023-09-12
