Abstract
AbstractWe perform a statistical analysis of magnetosonic (MS) waves in the slot region based on Van Allen Probes observations from September 2012 to February 2018. Our results demonstrate that the wave occurrence rate increases with enhanced geomagnetic activity and decreasing magnetic latitude, with the presence of strongest slot region MS waves near the geomagnetic equator within the 08–20 magnetic local time sector. Power spectral densities of slot region MS waves also intensify during geomagnetically active times, with the occurrence of the major wave power (>∼10−5 nT2/Hz) below ∼25fcp (where fcp is the proton gyrofrequency) and the peak wave intensity (∼10−3 nT2/Hz) below ∼5fcp at L > ∼2.6. A remarkable gap in the MS wave frequency spectrum is also revealed at <∼15fcp during weak substorm activities (AE 300 nT).
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