Poh, G;
Slavin, JA;
Jia, X;
Raines, JM;
Imber, SM;
Sun, W-J;
Gershman, DJ;
... Smith, AW; + view all
(2017)
Mercury's cross-tail current sheet: Structure, X-line location and stress balance.
[Letter].
Geophysical Research Letters
, 44
(2)
pp. 678-686.
10.1002/2016GL071612.
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Abstract
The structure, X‐line location, and magnetohydrodynamic (MHD) stress balance of Mercury's magnetotail were examined between −2.6 < XMSM < −1.4 RM using MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) measurements from 319 central plasma sheet (CPS) crossings. The mean plasma β in the CPS calculated from MESSENGER data is ~ 6. The CPS magnetic field was southward (i.e., tailward of X‐line) ~ 2–18% of the time. Extrapolation of downtail variations in BZ indicates an average X‐line location at −3 RM. Modeling of magnetic field measurements produced a cross‐tail current sheet (CS) thickness, current density, and inner CS edge location of 0.39 RM, 92 nA/m2 and −1.22 RM, respectively. Application of MHD stress balance suggests that heavy planetary ions may be important in maintaining stress balance within Mercury's CPS. Qualitative similarities between Mercury's and Earth's magnetotail are remarkable given the differences in upstream conditions, internal plasma composition, finite gyro‐radius scaling, and Mercury's lack of ionosphere.
| Type: | Article |
|---|---|
| Title: | Mercury's cross-tail current sheet: Structure, X-line location and stress balance |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/2016GL071612 |
| Publisher version: | https://doi.org/10.1002/2016GL071612 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Mercury, cross‐tail current sheet, stress balance, Near‐Mercury Neutral Line, magnetotail structure |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10061131 |
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