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  High‐Density Magnetospheric He+ at the Dayside Magnetopause and Its Effect on Magnetic Reconnection

Fuselier, S. A., Haaland, S., Tenfjord, P., Paschmann, G., Toledo‐Redondo, S., Malaspina, D., et al. (2021). High‐Density Magnetospheric He+ at the Dayside Magnetopause and Its Effect on Magnetic Reconnection. Journal of Geophysical Research: Space Physics, 126(1): 2020JA028722. doi:10.1029/2020JA028722.

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Genre: Journal Article
Other : High‐Density Magnetospheric He+ at the Dayside Magnetopause and Its Effect on Magnetic Reconnection

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 Creators:
Fuselier, S. A., Author
Haaland, Stein1, Author              
Tenfjord, P., Author
Paschmann, G., Author
Toledo‐Redondo, S., Author
Malaspina, D., Author
Kim, M. J., Author
Trattner, K. J., Author
Petrinec, S. M., Author
Giles, B. L., Author
Goldstein, J., Author
Burch, J. L., Author
Strangeway, R. J., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: Observations from the Magnetospheric Multiscale (MMS) mission are used to quantify the maximum effect of magnetospheric H+ and He+ on dayside magnetopause reconnection. A data base of current‐sheet crossings from the first 2 years of the MMS mission is used to identify magnetopause crossings with the highest He+ concentrations. While all of these magnetopause crossings exhibit evidence of plasmaspheric plume material, only half of the crossings are directly associated with plasmaspheric plumes. The He+ density varies dramatically within the magnetosphere adjacent to the magnetopause, with density variations of an order of magnitude on timescales as short as 10 s, the time resolution of the composition instrument on MMS. Plasma wave observations are used to determine the total electron density, and composition measurements are used to determine the mass density in the magnetosheath and magnetosphere. These mass densities are then used with the magnetic field observations to determine the theoretical reduction in the reconnection rate at the magnetopause. The presence of high‐density plasmaspheric plume material at the magnetopause causes transient reductions in the reconnection rate of up to ∼40%.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2020JA028722
 Degree: -

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Title: Journal of Geophysical Research: Space Physics
  Other : JGR-A
  Abbreviation : J. Geophys. Res. - A
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 126 (1) Sequence Number: 2020JA028722 Start / End Page: - Identifier: ISSN: 0148-0227
CoNE: https://pure.mpg.de/cone/journals/resource/991042728714264