Timing of energetic proton enhancements relative to magnetospheric substorm activity and its implication for substorm theories

Details Timing of energetic proton enhancements relative to magnetospheric substorm activity and its implication for substorm theories Timing of energetic proton enhancements relative to magnetospheric substorm activity and its implication for substorm theories

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.1415b&link_type=abstract

Journal of Geophysical Research, vol. 86, Mar. 1, 1981, p. 1415-1421. Research sponsored by the U.S. Department of Energy and D

Physics

30

Magnetic Storms, Magnetospheric Instability, Magnetospheric Proton Density, Proton Energy, Geomagnetic Tail, Geosynchronous Orbits, Magnetoactivity, Plasma Layers, Proton Flux Density, Space Plasmas

Scientific paper

A neutral line model of substorms is used to explain the timing of proton enhancements relative to substorm onsets and recoveries and plasma sheet thinnings and recoveries. The model is based on energetic proton data from synchronous orbiting satellites and from Vela satellites in the magnetotail. The protons are impulsively accelerated at substorm onset (possibly near the neutral line) and subsequently appear to stream both sunward and antisunward as discrete particle bunches with those flowing sunward observed as drift echoes in the inner magnetosphere and those flowing antisunward seen as impulsive bursts in the magnetotail. The more frequently observed rapid-rise slow-decay type of plasma sheet proton enhancements occur during the substorm recovery phase and are accounted for by the envelopment of the observing satellite by the expanding plasma sheet into which protons previously injected into the outer radiation zone have leaked.

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