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A new field‐aligned current index AF and its relation to the storm‐time ring current and energetic neutral atom (ENA) emissions
Author(s) -
Sun W.,
Akasofu S.I.
Publication year - 2002
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 - 10.1029/2002gl014762
Subject(s) - ring current , physics , current (fluid) , geomagnetic storm , earth's magnetic field , field (mathematics) , atmospheric sciences , index (typography) , atomic physics , satellite , storm , ionosphere , magnetosphere , magnetic field , environmental science , geophysics , computational physics , meteorology , astronomy , quantum mechanics , mathematics , world wide web , computer science , pure mathematics , thermodynamics
It is shown that a newly devised field‐aligned current index AF is well correlated with the Dst index, the correlation coefficient being 0.93. The AF index is based on the fact that geomagnetic Y (or D) component variations in the middle and low latitudes are mainly caused by field‐aligned currents. It is also demonstrated that energetic neutral atom (ENA) emissions measured by the Geotail satellite are well correlated with the AF index.