Low-altitude signatures of the boundary layers

Details Low-altitude signatures of the boundary layers Low-altitude signatures of the boundary layers

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979esasp.148..167r&link_type=abstract

In ESA Magnetospheric Boundary Layers p 167-173 (SEE N80-13529 04-42)

Physics

Auroral Zones, Boundary Layer Plasmas, Magnetic Signatures, Magnetopause, Electrons, Flux (Rate), Geomagnetic Latitude, Interplanetary Magnetic Fields, Low Altitude, Proton Energy

Scientific paper

Low altitude measurements reveal two distinct types of dayside boundary-layer plasmas. The first type is characterized by a proton distribution whose average energy decreases with increasing latitude and generally shows cool, unaccelerated electron fluxes. This type is observed only near noon and is correlated with southward interplanetary magnetic field (IMF). The second type is characterized by a 'V' signature in which the proton average energy first decreases then briefly increases as a function of latitude. The electron distribution in the latter case is hotter and often shows evidence of small scale acceleration regions. This type can be seen at all local times in the dayside and at noon is correlated with a northward IMF. It is suggested that the type 1 plasma is the low altitude signature of the plasma mantle and the type 2 plasma is the low altitude signature of the low latitude boundary layer.

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