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The Electron Structure of the Solar Wind
Journal article   Open access   Peer reviewed

The Electron Structure of the Solar Wind

Joseph E. Borovsky, Jasper S. Halekas and Phyllis L. Whittlesey
Frontiers in astronomy and space sciences, Vol.8, 690005
06/08/2021
DOI: 10.3389/fspas.2021.690005
url
https://doi.org/10.3389/fspas.2021.690005View
Published (Version of record) Open Access

Abstract

Time-series measurements of the number density n(core) and temperature T-core of the core-electron population of the solar wind are examined at 1 AU and at 0.13 AU using measurements from the WIND and Parker Solar Probe spacecraft, respectively. A statistical analysis of the n(core) and T-core measurements at 1 AU finds that the core-electron spatial structure of the solar wind is related to the magnetic-flux-tube structure of the solar wind; this electron structure is characterized by jumps in the values of n(core) and T-core when passing from one magnetic flux tube into the next. The same types of flux-tube jumps are seen for T-core at 0.13 AU. Some models of the interplanetary electrical potential of the heliosphere predict that T-core is a direct measure of the local electrical potential in the heliosphere. If so, then jumps seen in T-core represent jumps in the electrical potential from flux tube to flux tube. This may imply that the interplanetary electrical potential (and its effect on the radial evolution away from the Sun of solar-wind ions and electrons) independently operates in each flux tube of the heliosphere.
 Physical Sciences Astronomy & Astrophysics Science & Technology

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