Investigation on Pi1 B pulsations using THEMIS ground-based magnetometers

Details Investigation on Pi1 B pulsations using THEMIS ground-based magnetometers Investigation on Pi1 B pulsations using THEMIS ground-based magnetometers

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm23a1180g&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM23A-1180

Physics

2407 Auroral Ionosphere (2704), 2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431), 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2790 Substorms

Scientific paper

Pi1 B pulsations are believed associated with substorm onset. Because of the higher frequencies, 25 mHz to 1 Hz, Pi1 B has the potential to be a more accurate indicator of the time of substorm onset than Pi 2 pulsation. Thus it is important to understand the generation mechanism of Pi1 B and the relation between Pi1 B pulsations and substorm onset. However, observations of Pi1 B pulsations are not as easy as those of Pi 2 pulsations because of both smaller areas of Pi1 B occurrence and the limited availability of high-resolution magnetometer data on the ground. The THEMIS ground-based magnetometer network records magnetic field data with 0.5 second resolution and covers the full longitude of North American part of the auroral zone and sub-auroral region. We will examine the occurrence of Pi1 B pulsations using THEMIS ground magnetometer data to understand the local time and latitudinal distributions of Pi1 B. We will use the T.-S. Hsu's substorm event list which is identified by AL and Pi2 to examine the relation of Pi1 B and substorm onset.

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