First Report of Electron Measurements During a Europa Footprint Tail Crossing by Juno

被引：29

作者：

Allegrini, F. ^{[1
,2
]}

Gladstone, G. R. ^{[1
,2
]}

Hue, V ^{[1
]}

Clark, G. ^{[3
]}

Szalay, J. R. ^{[4
]}

Kurth, W. S. ^{[5
]}

Bagenal, F. ^{[6
]}

Bolton, S. ^{[1
]}

Connerney, J. E. P. ^{[7
,8
]}

Ebert, R. W. ^{[1
,2
]}

Greathouse, T. K. ^{[1
]}

Hospodarsky, G. B. ^{[5
]}

Imai, M. ^{[5
,9
]}

Louarn, P. ^{[10
]}

Mauk, B. H. ^{[3
]}

McComas, D. J. ^{[4
]}

Saur, J. ^{[11
]}

Sulaiman, A. H. ^{[5
]}

Valek, P. W. ^{[1
]}

Wilson, R. J. ^{[6
]}

机构：

[1] Southwest Res Inst, San Antonio, TX 78238 USA

[2] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA

[3] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA

[4] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[5] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[6] Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO USA

[7] Space Res Corp, Annapolis, MD USA

[8] Goddard Space Flight Ctr, Greenbelt, MD USA

[9] Natl Inst Technol KOSEN, Dept Elect Engn & Informat Sci, Niihama Coll, Niihama, Japan

[10] Inst Rech Astrophys & Planetol IRAP, Toulouse, France

[11] Univ Cologne, Inst Geophys & Meteorol, Cologne, Germany

来源：

GEOPHYSICAL RESEARCH LETTERS | 2020年 / 47卷 / 18期

关键词：

Jupiter aurora; electrons; Europa footprint tail; JOVIAN AURORA; EMISSIONS; IO; ACCELERATION; JUPITER;

D O I：

10.1029/2020GL089732

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We report the first in situ observations of electron measurements at a Europa footprint tail (FPT) crossing in the auroral region. During its 12th science perijove pass, Juno crossed magnetic field lines connected to Europa's FPT. We find that electrons in the range similar to 0.4 to similar to 25 keV, with a characteristic energy of 3.6 +/- 0.5 keV, precipitate into Jupiter's atmosphere to create the footprint aurora. The energy flux peaks at similar to 36 mW/m(2), while the peak ultraviolet (UV) brightness is estimated at 37 kR. We estimate the peak electron density and temperature to be 17.3 cm(-3) and 1.8 +/- 0.1 keV, respectively. Using magnetic flux shell mapping, we estimate that the radial width of the interaction at Europa's orbit spans roughly 3.6 +/- 1.0 Europa radii. In contrast to typical Io FPT crossings, the instrument background caused by penetrating energetic radiation (> similar to 5-10 MeV electrons) increased during the Europa FPT crossing.

引用

页数：10

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