Suprathermal electron loss cone distributions in the solar wind: Ulysses observations

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We present observations by the Ulysses solar wind plasma experiment of a new class of suprathermal electron signatures. At low solar latitudes and heliocentric distances beyond 3.37 AU Ulysses encountered seven intervals, ranging in duration from 1 hour to 22 hours, in which the suprathermal distributions included an antisunward field-aligned beam and a return population with a flux dropout typically spanning {plus_minus}60 ft from the sunward field-aligned direction. All events occurred between the forward and reverse shocks or waves bounding corotating interaction regions (CIRs). The observations support a scenario in which the sunward-moving electrons result from reflection of the prevailing ... continued below

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12 p.

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Phillips, J.L.; Feldman, W.C.; Gosling, J.T.; Hammond, C.M. & Forsyth, R.J. September 1, 1995.

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We present observations by the Ulysses solar wind plasma experiment of a new class of suprathermal electron signatures. At low solar latitudes and heliocentric distances beyond 3.37 AU Ulysses encountered seven intervals, ranging in duration from 1 hour to 22 hours, in which the suprathermal distributions included an antisunward field-aligned beam and a return population with a flux dropout typically spanning {plus_minus}60 ft from the sunward field-aligned direction. All events occurred between the forward and reverse shocks or waves bounding corotating interaction regions (CIRs). The observations support a scenario in which the sunward-moving electrons result from reflection of the prevailing antisunward field-aligned beam at magnetic field compressions downstream from the spacecraft, with wide loss cones caused by the relatively weak mirror ratio. This hypothesis requires that the field magnitude within the CIRs actually increased locally with increasing field-aligned distance from the Sun.

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12 p.

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OSTI as DE95016967

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  • 8. international solar wind conference, Dana Point, CA (United States), 26-30 Jun 1995

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  • Other: DE95016967
  • Report No.: LA-UR--95-2664
  • Report No.: CONF-9506256--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 105101
  • Archival Resource Key: ark:/67531/metadc621809

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  • September 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Aug. 8, 2016, 8:54 p.m.

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Phillips, J.L.; Feldman, W.C.; Gosling, J.T.; Hammond, C.M. & Forsyth, R.J. Suprathermal electron loss cone distributions in the solar wind: Ulysses observations, article, September 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc621809/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.