TSUBASA (MDS-1) Observations of Pc5 Pulsations in the Inner Magnetosphere

Details TSUBASA (MDS-1) Observations of Pc5 Pulsations in the Inner Magnetosphere TSUBASA (MDS-1) Observations of Pc5 Pulsations in the Inner Magnetosphere

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm51a0517m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM51A-0517

Other

2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities

Scientific paper

Although it is known that variations of relativistic electron flux in the outer radiation belt correlate reasonably well with Pc5 pulsation power, we need more observational and theoretical supports in order to examine whether the Pc5 pulsations cause relativistic electron flux enhancements. In particular, we need to investigate spatial characteristics of Pc5 pulsations in space, since previous studies have focused on observations on the ground and at geostationary orbit. In order to approach this subject, we address Pc5 pulsations associated with enhanced relativistic electron flux by using data from the TSUBASA (MDS-1) satellite at geo-transfer orbit (500-36000km). The data includes high-energy charged particle flux (electron: 0.4-50MeV; proton: 0.9-250MeV) and high-resolution three vector components of magnetic field. We also compare these data with data from ground magnetometer networks and other satellites. The analyses showed that the relativistic electron flux depends on the L-shell parameter and time, and that drastic increases of the relativistic electron flux at L~5-7 correlate closely with occurrence of troidal-mode Pc5 pulsations with large amplitude. This is particularly noticeable when Pc5 pulsation activity is high because of interplanetary CME arrival at the Earth. The results imply that these Pc5 pulsations are a possible source accelerating energetic electrons in the regions.

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