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Magnetopause erosion during the 17 March 2015 magnetic storm: Combined field‐aligned currents, auroral oval, and magnetopause observations
Author(s) -
Le G.,
Lühr H.,
Anderson B. J.,
Strangeway R. J.,
Russell C. T.,
Singer H.,
Slavin J. A.,
Zhang Y.,
Huang T.,
Bromund K.,
Chi P. J.,
Lu G.,
Fischer D.,
Kepko E. L.,
Leinweber H. K.,
Magnes W.,
Nakamura R.,
Plaschke F.,
Park J.,
Rauberg J.,
Stolle C.,
Torbert R. B.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl068257
Subject(s) - magnetopause , geophysics , magnetosheath , magnetosphere , interplanetary magnetic field , magnetic reconnection , physics , solar wind , ionosphere , magnetic field , flux (metallurgy) , geology , materials science , quantum mechanics , metallurgy
We present multimission observations of field‐aligned currents, auroral oval, and magnetopause crossings during the 17 March 2015 magnetic storm. Dayside reconnection is expected to transport magnetic flux, strengthen field‐aligned currents, lead to polar cap expansion and magnetopause erosion. Our multimission observations assemble evidence for all these manifestations. After a prolonged period of strongly southward interplanetary magnetic field, Swarm and AMPERE observe significant intensification of field‐aligned currents. The dayside auroral oval, as seen by DMSP, appears as a thin arc associated with ongoing dayside reconnection. Both the field‐aligned currents and the auroral arc move equatorward reaching as low as ~60° magnetic latitude. Strong magnetopause erosion is evident in the in situ measurements of the magnetopause crossings by GOES 13/15 and MMS. The coordinated Swarm, AMPERE, DMSP, MMS and GOES observations, with both global and in situ coverage of the key regions, provide a clear demonstration of the effects of dayside reconnection on the entire magnetosphere.