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  Estimating the Kinetic Energy Budget of the Polar Wind Outflow

Li, K., Wei, Y., Haaland, S., Kronberg, E. A., Rong, Z. J., Maes, L., et al. (2018). Estimating the Kinetic Energy Budget of the Polar Wind Outflow. Journal of Geophysical Research: Space Physics, 123(9), 7917-7929. doi:10.1029/2018JA025819.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-E0F5-C Version Permalink: http://hdl.handle.net/21.11116/0000-0002-E0F6-B
Genre: Journal Article

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 Creators:
Li, Kun, Author
Wei, Y., Author
Haaland, Stein1, Author              
Kronberg, Elena A.1, Author              
Rong, Z. J., Author
Maes, Lukas1, Author              
Maggiolo, R., Author
André, M., Author
Nilsson, H., Author
Grigorenko, E., Author
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 MPIS_GROUPS: Planetary Plasmas
 MPIS_PROJECTS: Cluster
 Abstract: Ionospheric outflow from the polar cap through the polar wind plays an important role in the evolution of the atmosphere and magnetospheric dynamics. Both solar illumination and solar wind energy input are known to be energy sources of the polar wind. However, observational studies of the energy transfer from these two energy sources to the polar wind are difficult. Because of their low energy, polar wind ions are invisible to regular ion detectors onboard a positively charged spacecraft. Using a new technique that indirectly measures these low‐energy ions, we are able to estimate the energy budget of the polar wind. Our results show that solar illumination provides about 107 W of the kinetic energy of the polar wind, in addition to the energy transferred from the solar wind with a maximum rate of about 108 W. The energy transfer efficiency of solar illumination to the kinetic energy of the polar wind is about 6 to 7 orders of magnitude lower than that of the solar wind. Moreover, daily and seasonal changes in the orientation of the geomagnetic dipole axis control solar illumination over the polar cap, modulating both energies of the polar wind and energy transfer efficiencies from the two energy sources.

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Language(s): eng - English
 Dates: 2018-12-3020182018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1029/2018JA025819
 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: 123 (9) Sequence Number: - Start / End Page: 7917 - 7929 Identifier: ISSN: 0148-0227
CoNE: https://pure.mpg.de/cone/journals/resource/991042728714264