Hasegawa, H;
McFadden, JP;
Constantinescu, OD;
Bogdanova, YV;
Wang, J;
Dunlop, MW;
Angelopoulos, V;
... Shi, JK; + view all
(2009)
Boundary layer plasma flows from high-latitude reconnection in the summer hemisphere for northward IMF: THEMIS multi-point observations.
Geophysical Research Letters
, 36
, Article L15107. 10.1029/2009GL039410.
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Abstract
On 2008-07-11, the THEMIS spacecraft, separated both longitudinally and radially, traversed the dayside low-latitude boundary layer (LLBL) under extended northward IMF. They detected southward flows of magnetosheath plasma from magnetopause reconnection poleward of the northern cusp, which were cold-dense, and had southward velocity similar to 100 km/s and longitudinal extent >3 R-E. These features all agree with a global MHD simulation of the magnetosphere for similar conditions, in which under large geomagnetic dipole tilt, an LLBL forms via poleward-of-the-cusp reconnection first in the summer hemisphere and later in the other. Contrary to the simulation, however, the observed LLBL was mostly magnetically closed, characterized by balanced field-aligned and anti-field-aligned electron fluxes, and was less thick (<= 0.5 R-E). The former suggests comparable reconnection rate in both hemispheres, while the latter suggests the actual reconnection rate being lower, and/or the plasma transport toward the magnetotail being faster, than in the simulation. Citation: Hasegawa, H., et al. (2009), Boundary layer plasma flows from high-latitude reconnection in the summer hemisphere for northward IMF: THEMIS multi-point observations, Geophys. Res. Lett., 36, L15107, doi: 10.1029/2009GL039410.
| Type: | Article |
|---|---|
| Title: | Boundary layer plasma flows from high-latitude reconnection in the summer hemisphere for northward IMF: THEMIS multi-point observations |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1029/2009GL039410 |
| Publisher version: | http://dx.doi.org/10.1029/2009GL039410 |
| Language: | English |
| Additional information: | Copyright 2009 by the American Geophysical Union |
| Keywords: | Interplanetary magnetic-field, Particle signatures, Magnetopause, Magnetometer, Instrument, Sheet, Model |
| 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/162569 |
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