Subauroral magnetic activity during magnetic quiet periods as described using 15-minutes alpha magnetic index

Aurélie Marchaudon (1) , Aude Chambodut (2) , Chantal Lathuillière (3) , Michel Menvielle (4)

1 IRAP - Institut de recherche en astrophysique et planétologie
2 EOST - Ecole et Observatoire des Sciences de la Terre
3 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
4 HELIOS - LATMOS

The 15-minutes alpha magnetic indices are new proxies based on a dense network of magnetic observatories at sub-auroral latitudes in both hemispheres. Their novel derivation scheme aims at describing the geomagnetic activity with a high spatial and temporal resolution, and also at characterizing sub-auroral magnetic activity during magnetic quiet periods with an unprecedented resolution. We took advantage of these characteristics to show how they help to discriminate magnetically quiet and very quiet periods. Some comparisons with other geomagnetic indices are presented.

Mots clés: geomagnetic indices; quiet period; 15-minutes indices; hemispheric and sectorial indices

Domaines: Physique Atmosphérique et Océanique [physics.ao-ph]; Océan, Atmosphère

Aurélie Marchaudon, Aude Chambodut, Chantal Lathuillière, Michel Menvielle. Subauroral magnetic activity during magnetic quiet periods as described using 15-minutes alpha magnetic index. 26th IUGG, General Assembly 2015, Jun 2015, Prague, Czech Republic. ⟨insu-01409277⟩