Quantitative analysis of bidirectional electron fluxes within coronal mass ejections at 1 AU

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The solar wind electron heat flux is carried primarily by suprathermal halo'' electrons beamed antisunward along the interplanetary magnetic field (IMF), indicating magnetic connection to the Sun only in one direction. However, electron observations at 1 AU show that counterstreaming halo beams, suggesting closed magnetic structures, prevail within coronal mass ejections (CMEs). These structures might be magnetic tongues'', tied to the Sun at both ends, magnetically detached plasmoids, or complex flux rope structures. Here we present first results of analysis of ISEE-3 observations within 39 CMEs, including the asymmetry between the counterstreaming beams and its control by the IMF orientation, ... continued below

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Pages: (14 p)

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Phillips, J.L.; Gosling, J.T.; McComas, D.J.; Bame, S.J. & Feldman, W.C. January 1, 1991.

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The solar wind electron heat flux is carried primarily by suprathermal halo'' electrons beamed antisunward along the interplanetary magnetic field (IMF), indicating magnetic connection to the Sun only in one direction. However, electron observations at 1 AU show that counterstreaming halo beams, suggesting closed magnetic structures, prevail within coronal mass ejections (CMEs). These structures might be magnetic tongues'', tied to the Sun at both ends, magnetically detached plasmoids, or complex flux rope structures. Here we present first results of analysis of ISEE-3 observations within 39 CMEs, including the asymmetry between the counterstreaming beams and its control by the IMF orientation, and the variation of the electron distributions as CMEs convect past the spacecraft. We find that some CMEs contain nearly symmetric electron beams, while others are strongly asymmetric, and that the antisunward beam is generally dominant. The more nearly radial the IMF, the greater is the asymmetry between outward and inward beams. We present an example of a distinctive strahl-on-strahl'' distribution, suggesting continued magnetic connection to the corona, in which a narrow antisunward beam is superimposed on a broader beam. Taken as a whole, our results appear to favor a tongue or flux rope scenario rather than a fully detached plasmoid. 4 refs., 6 figs.

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Pages: (14 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • 7. solar wind conference, Goslar (Germany), 16-21 Sep 1991

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  • Other: DE92002459
  • Report No.: LA-UR-91-3353
  • Report No.: CONF-910915--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5073252
  • Archival Resource Key: ark:/67531/metadc1061850

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  • January 1, 1991

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 7:05 p.m.

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Phillips, J.L.; Gosling, J.T.; McComas, D.J.; Bame, S.J. & Feldman, W.C. Quantitative analysis of bidirectional electron fluxes within coronal mass ejections at 1 AU, article, January 1, 1991; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1061850/: accessed June 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.