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Title: Observations of significant magnetosheath antisolar energy flow

Abstract

Evidence for significant but sporadic magnetosheath energy flows in the antisolar direction is presented, using observations of 50 to 220-keV ions made by the NOAA/Applied Physics Laboratory energetic particle experiment on the Imp 7 satellite. The observations have been made in the dawn and dusk magnetosheath at distances of approx.35R/sub E/ from the earth and cover a wide range of Z/sub S/M. Direct observations of 50-to 220-keV ions yield an energy flow for the case studied of 2(10)/sup 3/-2(10)/sup 2/ erg/cm/sup 2/ s. By using a somewhat arbitrary but reasonable magnetosheath area based on 1 year of synoptic survey of such flows a total magnetosheath > or =50-keV ion energy flow of > or approx. =10/sup 18/ ergs/s is obtained. Reasonable spectral extrapolations yield somewhat larger total flows. These values indicate that ions carry at least an equal portion of the energetic particle magnetosheath energy flow as the extrapolated >1-keV electron flow obtained by Baker and Stone (1977). Possible sources of this energy flow include dissipation processes due to a magnetopause electric field, leakage of magnetospheric particles through the magnetopause into the magnetosheath, bow shock acceleration, and magnetosheath acceleration.

Authors:
Publication Date:
Research Org.:
NOAA Space Environment Laboratory, Boulder, Colorado 80303
OSTI Identifier:
5981445
Resource Type:
Journal Article
Journal Name:
J. Geophys. Res.; (United States)
Additional Journal Information:
Journal Volume: 84:A5
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; MAGNETOSHEATH; PLASMA DRIFT; ELECTRIC FIELDS; ELECTRON TEMPERATURE; ENERGY LOSSES; ENERGY SPECTRA; IMP SATELLITES; ION TEMPERATURE; MAGNETOPAUSE; PLASMA ACCELERATION; ACCELERATION; LOSSES; SATELLITES; SPECTRA; 640203* - Atmospheric Physics- Magnetospheric Phenomena- (-1987)

Citation Formats

Williams, D J. Observations of significant magnetosheath antisolar energy flow. United States: N. p., 1979. Web. doi:10.1029/JA084iA05p02105.
Williams, D J. Observations of significant magnetosheath antisolar energy flow. United States. doi:10.1029/JA084iA05p02105.
Williams, D J. Tue . "Observations of significant magnetosheath antisolar energy flow". United States. doi:10.1029/JA084iA05p02105.
@article{osti_5981445,
title = {Observations of significant magnetosheath antisolar energy flow},
author = {Williams, D J},
abstractNote = {Evidence for significant but sporadic magnetosheath energy flows in the antisolar direction is presented, using observations of 50 to 220-keV ions made by the NOAA/Applied Physics Laboratory energetic particle experiment on the Imp 7 satellite. The observations have been made in the dawn and dusk magnetosheath at distances of approx.35R/sub E/ from the earth and cover a wide range of Z/sub S/M. Direct observations of 50-to 220-keV ions yield an energy flow for the case studied of 2(10)/sup 3/-2(10)/sup 2/ erg/cm/sup 2/ s. By using a somewhat arbitrary but reasonable magnetosheath area based on 1 year of synoptic survey of such flows a total magnetosheath > or =50-keV ion energy flow of > or approx. =10/sup 18/ ergs/s is obtained. Reasonable spectral extrapolations yield somewhat larger total flows. These values indicate that ions carry at least an equal portion of the energetic particle magnetosheath energy flow as the extrapolated >1-keV electron flow obtained by Baker and Stone (1977). Possible sources of this energy flow include dissipation processes due to a magnetopause electric field, leakage of magnetospheric particles through the magnetopause into the magnetosheath, bow shock acceleration, and magnetosheath acceleration.},
doi = {10.1029/JA084iA05p02105},
journal = {J. Geophys. Res.; (United States)},
number = ,
volume = 84:A5,
place = {United States},
year = {1979},
month = {5}
}