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Detailed Reference Information |
Terasawa, T., Scholer, M., Ipavich, F.M., Hovestadt, D., Klecker, B., Gloeckler, G., Sanderson, T.R., Wenzel, K.-P. and Smith, E.J. (1985). Particles upstream of the pre-dawn bow shock: ISEE-3 observations. Geophysical Research Letters 12: doi: 10.1029/GL012i006p00373. issn: 0094-8276. |
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The first observations of energetic ions (>30 keV) in the region upstream of the pre-dawn bow shock (0>X>-60 Re) are presented. The intensity in this region is controlled by the direction of the interplanetary magnetic field (IMF) and is maximized when the IMF is around the spiral direction. The particle distributions are highly anisotropic with the anisotropy directed perpendicular to the magnetic field. In the E¿B frame this perpendicular anisotropy is conserved and it is argued that the distribution is pancake-like. This indicates that the energetic particles in the pre-dawn upstream region have their origin in the near-earth upstream region, from where they are convected by the solar wind perpendicular to the magnetic field. It is therefore concluded that acceleration occurs mainly near the nose of the bow shock and particle acceleration at the distant bow shock is weak. |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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