Premium
Magnetotail variations associated with substorm expansion onsets for storm time and nonstorm time
Author(s) -
Miyashita Y.,
Kamide Y.,
Miyoshi Y.,
Machida S.,
Liou K.,
Mukai T.,
Saito Y.,
Meng C.I.,
Parks G. K.
Publication year - 2006
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 - 10.1029/2006gl028142
Subject(s) - substorm , storm , physics , geomagnetic storm , geophysics , magnetosphere , magnetic reconnection , atmospheric sciences , meteorology , solar wind , magnetic field , quantum mechanics
We have statistically studied magnetotail variations associated with expansion onsets for storm and nonstorm time substorms, using Geotail data. Here storm time was defined as Sym ‐ H ≤ −30 nT. It was found that there are no qualitative differences in magnetotail variations between these two types of substorms, although the energy accumulation and the dipolarization tend to be more significant during storm time substorms. The statistical results evidently show that the magnetic reconnection and the dipolarization do occur in the magnetotail around onset for both types of substorms, suggesting that storm and nonstorm time substorms are caused by the same mechanism.