Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm31b1240m&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM31B-1240
Physics
7871 Waves And Instabilities, 7894 Instruments And Techniques, 2772 Plasma Waves And Instabilities, 2788 Storms And Substorms
Scientific paper
Thirty-six isolated substorms were identified using the energetic electron flux from the LANL 1994-089 satellite. Ground-based magnetometer data was collected from the MM210 and MEASURE arrays to compare Pi 2 wave power and Pi 2 peak frequencies between the night and the daysides. Each substorm event was classified as combinations of Pi 2, Pc3, and Pc 4. Strong dayside Pi 2's were present in 25% of the events increasing to 83% for all categories of Pi 2. The amplitude of the night and day Pi 2 increases with L shell along the similar trend. The Night Pi 2 occurred between 2:00 and 3:00 a.m. putting them in the category of a flank Pi 2. The frequency of the night Pi 2 decreased with an increasing L shell and the night Pi 2, between an L = 1.0 and L = 2.5 showed a tendency for equality. The day Pi 2frequency occurred within 1.5 hours of local noon. The day Pi 2 frequencies also showed a tendency for equality between an L = 1.0 and L = 2.5. The median frequency for the low L shell day Pi 2, showed a similarity to the mid to high L shell night Pi 2. The majority of day Pi 2 appears to occur before the night Pi 2 approximately 20 minutes before the energetic particle injection of the substorm. A hint of a linear trend between solar wind dynamic pressure and the day Pi 2 suggests the day Pi 2 is a directly driven field line oscillation coupling with a cavity resonance mode minutes before a substorm.
Martin Philippe A.
Moldwin Mark B.
Rassoul Hamid K.
Reeves Galen
Yumoto Kiyo
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