Research output: Contribution to journal › Article › peer-review
Two spacecraft observations of a reconnection pulse during an auroral breakup. / Petrukovich, A. A.; Sergeev, V. A.; Zelenyi, L. M.; Mukai, T.; Yamamoto, T.; Kokubun, S.; Shiokawa, K.; Deehr, C. S.; Budnick, E. Y.; Büchner, J.; Fedorov, A. O.; Grigorieva, V. P.; Hughes, T. J.; Pissarenko, N. F.; Romanov, S. A.; Sandahl, I.
In: Journal of Geophysical Research: Space Physics, Vol. 103, No. A1, 97JA02296, 01.01.1998, p. 47-59.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Two spacecraft observations of a reconnection pulse during an auroral breakup
AU - Petrukovich, A. A.
AU - Sergeev, V. A.
AU - Zelenyi, L. M.
AU - Mukai, T.
AU - Yamamoto, T.
AU - Kokubun, S.
AU - Shiokawa, K.
AU - Deehr, C. S.
AU - Budnick, E. Y.
AU - Büchner, J.
AU - Fedorov, A. O.
AU - Grigorieva, V. P.
AU - Hughes, T. J.
AU - Pissarenko, N. F.
AU - Romanov, S. A.
AU - Sandahl, I.
PY - 1998/1/1
Y1 - 1998/1/1
N2 - At 1130 UT on November 28, 1995, two spacecraft, Interball-Tail and Geotail, were in a favorable position to study the plasma sheet activity and an auroral breakup observed on the ground near the spacecraft ionospheric footpoints. Both spacecraft were near the neutral sheet, and they were nearly aligned along the magnetic meridian, During the auroral breakup observed at the equatorward half of the auroral oval (also registered as an AKR burst at Interball) both spacecraft simultaneously detected signatures of a reconnection pulse: The earthward plasma streaming and magnetic field dipolarization were observed at 12 R-E at Interball, while the tailward energetic ion beam, then the tailward flow and the passage of a plasmoid were observed at 28 R-E at Geotail. This pulse seem to proceed inside of the plasma sheet closed field lines, in the region of small (similar to 1 nT) background magnetic field at the neutral sheet. At Interball position the onset of fast earthward ion flow, likely initiated by the reconnection pulse, was followed by other manifestations (dipolarization, enhancements of the magnetic turbulence and the energetic particle flux, the intensification of field-aligned currents). Auroral observations showed initial brightening delayed an approximately 1 min after the commencement of the reconnection pulse. The auroral intensification was not accompanied by a significant magnetic disturbance on the ground, and therefore the event can be classified as the pseudobreakup. We estimate magnetic flux transport characteristics and possible location of the onset region in the plasma sheet. We conclude that observations during this event are consistent with the initiation of an auroral breakup by some disturbance (e.g., Alfven wave) generated by the reconnection pulse that commenced in the neutral sheet at similar to 15 R-E distance.
AB - At 1130 UT on November 28, 1995, two spacecraft, Interball-Tail and Geotail, were in a favorable position to study the plasma sheet activity and an auroral breakup observed on the ground near the spacecraft ionospheric footpoints. Both spacecraft were near the neutral sheet, and they were nearly aligned along the magnetic meridian, During the auroral breakup observed at the equatorward half of the auroral oval (also registered as an AKR burst at Interball) both spacecraft simultaneously detected signatures of a reconnection pulse: The earthward plasma streaming and magnetic field dipolarization were observed at 12 R-E at Interball, while the tailward energetic ion beam, then the tailward flow and the passage of a plasmoid were observed at 28 R-E at Geotail. This pulse seem to proceed inside of the plasma sheet closed field lines, in the region of small (similar to 1 nT) background magnetic field at the neutral sheet. At Interball position the onset of fast earthward ion flow, likely initiated by the reconnection pulse, was followed by other manifestations (dipolarization, enhancements of the magnetic turbulence and the energetic particle flux, the intensification of field-aligned currents). Auroral observations showed initial brightening delayed an approximately 1 min after the commencement of the reconnection pulse. The auroral intensification was not accompanied by a significant magnetic disturbance on the ground, and therefore the event can be classified as the pseudobreakup. We estimate magnetic flux transport characteristics and possible location of the onset region in the plasma sheet. We conclude that observations during this event are consistent with the initiation of an auroral breakup by some disturbance (e.g., Alfven wave) generated by the reconnection pulse that commenced in the neutral sheet at similar to 15 R-E distance.
KW - CURRENT DISRUPTION
KW - SUBSTORM
KW - MAGNETOSPHERE
KW - ONSET
KW - PSEUDOBREAKUP
KW - IONOSPHERE
KW - PARTICLE
KW - MODELS
KW - TAIL
KW - ION
UR - http://www.scopus.com/inward/record.url?scp=0008198794&partnerID=8YFLogxK
U2 - 10.1029/97JA02296
DO - 10.1029/97JA02296
M3 - статья
VL - 103
SP - 47
EP - 59
JO - Journal of Geophysical Research: Biogeosciences
JF - Journal of Geophysical Research: Biogeosciences
SN - 0148-0227
IS - A1
M1 - 97JA02296
ER -
ID: 36634032