Pi 2-associated particle flux and magnetic field modulations in geosynchronous altitudes

Details Pi 2-associated particle flux and magnetic field modulations in geosynchronous altitudes Pi 2-associated particle flux and magnetic field modulations in geosynchronous altitudes

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10211363s&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A6, p. 11363-11374

Physics

7

Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Plasma Convection, Magnetospheric Physics: Storms And Substorms

Scientific paper

A Pi 2 pulsation event was observed at the dip- equator (Huancayo, Peru; 75°W, 0306 LT) during the period from 0806 to 0815 UT on March 25, 1986. Geosynchronous satellite data from GOES 6 (0106-0115 LT) and 1984-129 (2146-2155 LT) in the midnight sector during the above interval were examined to investigate the field and particle (electron, 30-300 keV; proton, 72-573 keV) signatures in space that correlated with the Pi 2 pulsation at the dip- equator. The Pi 2 onset was seen to occur in association with the flux enhancement both for electrons and ions, and concurrent modulation of the flux and magnetic fields lasted thereafter for 10 min. In spite of a local time separation of 5.3 hours between the ground and satellite locations, the waveform in space resembled that of the Pi 2 on the ground. To account for such coherent oscillations between space and ground locations, we invoke a transient response of the nightside magnetosphere to the injected particles at the substorm expansion onset, rather than hydromagnetic instabilities arising from the interactions with the injected hot particles.

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