Ground-Based and FAST Observations of Pc 1-2 Type ULF Waves in the Dayside Cusp Region

Details Ground-Based and FAST Observations of Pc 1-2 Type ULF Waves in the Dayside Cusp Region Ground-Based and FAST Observations of Pc 1-2 Type ULF Waves in the Dayside Cusp Region

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm22b..07k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM22B-07

Physics

2407 Auroral Ionosphere (2704), 2706 Cusp, 2736 Magnetosphere/Ionosphere Interactions (2431), 6984 Waves In Plasma (7867), 7836 Mhd Waves And Instabilities (2149, 2752, 6050)

Scientific paper

A closely-spaced search-coil ultra low frequency (ULF) magnetometer array installed in the northern hemisphere (Svalbard) observes Pc 1-2 type wave activity in the dayside cusp region. Perhaps the most commonly observed type of events is band-limited pulsations which typically occur from approximately 9 to 17 MLT over frequencies ranging from 0.2 to 0.4 Hz. Besides the band-limited features, some of the events display a variety of spectral structures such as increasing (or decreasing) tones, broad-band bursts, harmonic structures, etc. This study focuses on FAST observations of the events in conjunction with the ground-based magnetometer data. The FAST satellite, which overflew the regions where the magnetic footprints map down to the locations of the magnetometers, shows that the ion/electron energies and pitch angle distributions observed by the satellite during the wave events are consistent with Alfven wave produced aurora - Alfvenic aurora. This implies that the ULF wave events provide the energy to generate the Alfvenic aurora. We discuss the effects of the wave activity in the magnetospheric/ionospheric processes using the simultaneous observations of the ground-based magnetometer and FAST satellite along with the ground-based all-sky auroral imagers.

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