Jovian High‐Latitude Ionospheric Ions: Juno In Situ Observations

Autor: P. W. Valek, F. Allegrini, F. Bagenal, S. J. Bolton, J. E. P. Connerney, R. W. Ebert, T. K. Kim, S. M. Levin, P. Louarn, D. J. Mccomas, J. R. Szalay, M. F. Thomsen, R. J. Wilson
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Geophysical Research Letters, Vol 46, Iss 15, Pp 8663-8670 (2019)
Druh dokumentu: article
ISSN: 1944-8007
0094-8276
DOI: 10.1029/2019GL084146
Popis: Abstract The low‐altitude, high‐velocity trajectory of the Juno spacecraft enables the Jovian Auroral Distributions Experiment to make the first in situ observations of the high‐latitude ionospheric plasma. Ions are observed to energies below 1 eV. The high‐latitude ionospheric ions are observed simultaneously with a loss cone in the magnetospheric ions, suggesting precipitating magnetospheric ions contribute to the heating of the upper ionosphere, raising the scale height, and pushing ionospheric ions to altitudes of 0.5 RJ above the planet where they are observed by Jovian Auroral Distributions Experiment. The source of the magnetospheric ions is tied to the Io torus and plasma sheet, indicated by the cutoff seen in both the magnetospheric and ionospheric plasma at the Io M‐shells. Equatorward of the Io M‐shell boundary, the ionospheric ions are not observed, indicating a drop in the scale height of the ionospheric ions at those latitudes.
Databáze: Directory of Open Access Journals
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