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| Titel |
MLT variations of sectorial geomagnetic activity indices: statistical and case event studies |
| VerfasserIn |
Michel Menvielle, Aude Chamboudout, Farida El-Lemdani Mazouz, Aurélie Marchaudon, Chantal Lathuillère |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250080024
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| Zusammenfassung |
| Solar-wind/magnetosphere interactions are not symmetric and show a local time dependency.
In order to better describe this effect, we define new Magnetic Local Time (MLT) sector
geomagnetic activity indices. These K-derived 3-hour indices are calculated on the basis of
aλ regional sector geomagnetic activity indices (themselves derived from am network
observatories) and thus reflect the geomagnetic activity at sub-auroral latitudes;
homogeneous data series of MLT sector geomagnetic indices can be derived from 1959
onwards.
In this study, we consider MLT sector geomagnetic indices computed for the 03-09,
09-15, 15-21, and 21-03 MLT sectors. We present a statistical study of their variations as a
function of local time, seasons, and geomagnetic activity level.
Results of an analysis of the variation of the K-derived MLT sector indices during
selected storm events are also presented giving consistent properties with the statistical study.
The Midnight MLT-sector indices present generally the highest amplitude during disturbed
geomagnetic activity period. |
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