Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm21a0302o&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM21A-0302
Physics
2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2768 Plasmasphere
Scientific paper
Recently there has been intense interest in estimation of the equatorial mass density based on measurements of field line resonance frequencies with ground magnetometers. Using cross-phase analysis of magnetometer array data, we determined the equatorial mass density during a moderate geomagnetic storm that followed several days of magnetically quiet conditions. Early in the storm recovery phase (Kp = 6+), the field line eigenfrequency over L = 2.3 - 3.8 was unusually high, corresponding to very low mass densities and flux tube depletion. Over the next few days the eigenfrequency at these L values progressively decreased, indicating refilling of the flux tube to pre-storm levels, superimposed upon diurnal variations. By comparing density measurements we determined the daytime ion refilling rates and fluxes at the 1000 km level for the L = 2.3, 2.6, 3.3, and 3.8 flux tubes. The upward ion fluxes decreased with increasing L-value, being around 4 x 108 amu/cc/sec at L=2.3 and 1.5 x 108 amu/cc/sec at L=3.8, respectively. We compare these observations with daytime upward electron fluxes measured by VLF whistler techniques, and investigate the L-value dependence in refilling rate. The latter may be attributed to solar zenith angle control of ion production rates.
Menk Frederick W.
Obana Yuki
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