Spacecraft measurements constraining the spatial extent of a magnetopause reconnection X line

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http://hdl.handle.net/10138/224166

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Walsh , B M , Komar , C M & Pfau-Kempf , Y 2017 , ' Spacecraft measurements constraining the spatial extent of a magnetopause reconnection X line ' , Geophysical Research Letters , vol. 44 , no. 7 , pp. 3038-3046 . https://doi.org/10.1002/2017GL073379

Titel: Spacecraft measurements constraining the spatial extent of a magnetopause reconnection X line
Författare: Walsh, B. M.; Komar, C. M.; Pfau-Kempf, Y.
Upphovmannens organisation: Department of Physics
Space Physics Research Group
Datum: 2017-04-16
Språk: eng
Sidantal: 9
Tillhör serie: Geophysical Research Letters
ISSN: 0094-8276
DOI: https://doi.org/10.1002/2017GL073379
Permanenta länken (URI): http://hdl.handle.net/10138/224166
Abstrakt: Multispacecraft measurements from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission are used to probe the spatial extent of an X line at the dayside magnetopause. A case study from 21 April 2014 is presented where two THEMIS spacecraft have a near-simultaneous encounter with the equatorial dayside magnetopause separated by 3.9 Earth radii. Both spacecraft observe similar steady inflow conditions with southward interplanetary magnetic field and a high magnetic shear angle at the magnetopause (133 degrees) boundary. One spacecraft observes clear fluid and kinetic signatures of active magnetic reconnection, while the other spacecraft does not observe reconnection. The predicted location of reconnection across the magnetopause is found using several theoretical models and a Block Adaptive Tree Solarwind Roe-type Upwind Scheme (BATS-R-US) MHD simulation. Each model predicts a continuous X line passing close to the two spacecraft, suggesting both would observe reconnection, if active. Using the constraints of the multipoint measurements, the extent or length L of the reconnection is estimated to be 2.4L <5.2h in local time or 6L<14 R-E.
Subject: Reconnection
Magnetopause
FLUX-TRANSFER EVENTS
INTERACTION OFMAGNETIC RECONNECTION
KELVIN-HELMHOLTZ MODES
MAGNETIC RECONNECTION
DAYSIDE MAGNETOPAUSE
EARTHS MAGNETOPAUSE
SOUTHWARD IMF
LOCAL TIME
CUSP
SIMULATIONS
114 Physical sciences
Referentgranskad: Ja
Licens: unspecified
Användningsbegränsning: openAccess
Parallelpublicerad version: submittedVersion


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