Final published version, 1.96 MB, PDF document
Available under license: CC BY
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Interplanetary magnetic field rotations followed from L1 to the ground
T2 - the response of the Earth's magnetosphere as seen by multi-spacecraft and ground-based observations
AU - Volwerk, M.
AU - Berchem, J.
AU - Bogdanova, Y. V.
AU - Constantinescu, O. D.
AU - Dunlop, M. W.
AU - Eastwood, J.P.
AU - Escoubet, P.
AU - Fazakerley, A. N.
AU - Frey, H.
AU - Hasegawa, H.
AU - Lavraud, B.
AU - Panov, E. V.
AU - Shen, C.
AU - Shi, J.-K.
AU - Taylor, M. G. G. T.
AU - Wang, J.
AU - Wild, James
AU - Zhang, Q.-H.
AU - Amm, O.
AU - Weygand, J. M.
N1 - From special edition "Cluster 10th anniversary workshop", Editor(s): I. A. Daglis, R. Nakamura, M. Taylor, and A. Masson.
PY - 2011/9/8
Y1 - 2011/9/8
N2 - A study of the interaction of solar wind magnetic field rotations with the Earth's magnetosphere is performed. For this event there is, for the first time, a full coverage over the dayside magnetosphere with multiple (multi)spacecraft missions from dawn to dusk, combined with ground magnetometers, radar and an auroral camera, this gives a unique coverage of the response of the Earth's magnetosphere. After a long period of southward IMF Bz and high dynamic pressure of the solar wind, the Earth's magnetosphere is eroded and compressed and reacts quickly to the turning of the magnetic field. We use data from the solar wind monitors ACE and Wind and from magnetospheric missions Cluster, THEMIS, DoubleStar and Geotail to investigate the behaviour of the magnetic rotations as they move through the bow shock and magnetosheath. The response of the magnetosphere is investigated through ground magnetometers and auroral keograms. It is found that the solar wind magnetic field drapes over the magnetopause, while still co-moving with the plasma flow at the flanks. The magnetopause reacts quickly to IMF Bz changes, setting up field aligned currents, poleward moving aurorae and strong ionospheric convection. Timing of the structures between the solar wind, magnetosheath and the ground shows that the advection time of the structures, using the solar wind velocity, correlates well with the timing differences between the spacecraft. The reaction time of the magnetopause and the ionospheric current systems to changes in the magnetosheath Bz seem to be almost immediate, allowing for the advection of the structure measured by the spacecraft closest to the magnetopause.
AB - A study of the interaction of solar wind magnetic field rotations with the Earth's magnetosphere is performed. For this event there is, for the first time, a full coverage over the dayside magnetosphere with multiple (multi)spacecraft missions from dawn to dusk, combined with ground magnetometers, radar and an auroral camera, this gives a unique coverage of the response of the Earth's magnetosphere. After a long period of southward IMF Bz and high dynamic pressure of the solar wind, the Earth's magnetosphere is eroded and compressed and reacts quickly to the turning of the magnetic field. We use data from the solar wind monitors ACE and Wind and from magnetospheric missions Cluster, THEMIS, DoubleStar and Geotail to investigate the behaviour of the magnetic rotations as they move through the bow shock and magnetosheath. The response of the magnetosphere is investigated through ground magnetometers and auroral keograms. It is found that the solar wind magnetic field drapes over the magnetopause, while still co-moving with the plasma flow at the flanks. The magnetopause reacts quickly to IMF Bz changes, setting up field aligned currents, poleward moving aurorae and strong ionospheric convection. Timing of the structures between the solar wind, magnetosheath and the ground shows that the advection time of the structures, using the solar wind velocity, correlates well with the timing differences between the spacecraft. The reaction time of the magnetopause and the ionospheric current systems to changes in the magnetosheath Bz seem to be almost immediate, allowing for the advection of the structure measured by the spacecraft closest to the magnetopause.
U2 - 10.5194/angeo-29-1549-2011
DO - 10.5194/angeo-29-1549-2011
M3 - Journal article
VL - 29
SP - 1549
EP - 1569
JO - Annales Geophysicae
JF - Annales Geophysicae
SN - 0992-7689
IS - 9
ER -