Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - On the simultaneity of substorm onset between two hemispheres
AU - Morioka, A.
AU - Miyoshi, Y.
AU - Tsuchiya, F.
AU - Misawa, H.
AU - Kasaba, Y.
AU - Asozu, T.
AU - Okano, S.
AU - Kadokura, A.
AU - Sato, N.
AU - Miyaoka, H.
AU - Yumoto, K.
AU - Parks, G.K.
AU - Honary, F.
AU - Trotignon, J.G.
AU - Décréau, P.M.E.
AU - Reinisch, B.W.
N1 - Copyright (2011) American Geophysical Union. Further reproduction or electronic distribution is not permitted.
PY - 2011/4/15
Y1 - 2011/4/15
N2 - Simultaneous observations of auroral kilometric radiation from the Northern and Southern Hemispheres showed some cases in which the buildup of field-aligned acceleration occurred only in one hemisphere at the substorm onset. This indicates that a substorm does not always complete the current system by connecting the cross-tail current with both northern and southern ionospheric currents. Conjugate auroral observations showed that in one case, the auroral breakup in the Northern and Southern Hemispheres was not simultaneous; rather, they occurred a few minutes apart. This time difference in the breakup between two hemispheres suggests that the local auroral ionosphere controls auroral breakup in each hemisphere independently. The evidence in this study may indicate that the buildup of the field-aligned acceleration region at the auroral breakup does not result only from the magnetospheric process and that the auroral ionosphere finally controls and/or ignites the substorm onset, that is, the auroral breakup.
AB - Simultaneous observations of auroral kilometric radiation from the Northern and Southern Hemispheres showed some cases in which the buildup of field-aligned acceleration occurred only in one hemisphere at the substorm onset. This indicates that a substorm does not always complete the current system by connecting the cross-tail current with both northern and southern ionospheric currents. Conjugate auroral observations showed that in one case, the auroral breakup in the Northern and Southern Hemispheres was not simultaneous; rather, they occurred a few minutes apart. This time difference in the breakup between two hemispheres suggests that the local auroral ionosphere controls auroral breakup in each hemisphere independently. The evidence in this study may indicate that the buildup of the field-aligned acceleration region at the auroral breakup does not result only from the magnetospheric process and that the auroral ionosphere finally controls and/or ignites the substorm onset, that is, the auroral breakup.
KW - magnetometer DCS-publications-id
KW - art-1027
KW - DCS-publications-credits
KW - iono
KW - samnet
KW - DCS-publications-personnel-id
KW - 5
U2 - 10.1029/2010JA016174
DO - 10.1029/2010JA016174
M3 - Journal article
VL - 116
SP - 1
EP - 15
JO - Journal of Geophysical Research
JF - Journal of Geophysical Research
SN - 0148-0227
IS - A04211
ER -