TY - JOUR AU - Chambodut Aude, Marchaudon Aur eacute AU - lie, Lathuill egrave AU - re Chantal, Menvielle Michel PY - 2015// TI - New hemispheric geomagnetic indices with 15 min time resolution T2 - 0148-0227 JO - Journal of Geophysical Research: Space Physics SP - 9943 EP - 9958 VL - 120 IS - 11 KW - geomagnetic activity KW - 15 min time resolution KW - magnetic storms and substorms KW - planetary and hemispheric indices KW - subauroral latitudes KW - 1739 Solar/planetary relationships KW - 1964 Real-time and responsive information delivery KW - 4305 Space weather KW - N2 - New subauroral 15 indices are proposed. They are based on a simple reproducible algorithm which relies on an as dense as possible network of magnetic observatories in each hemisphere. At first, the variation with time of local geomagnetic activity is determined at each magnetic station. Gathering all obtained stations' precomputed values, a normalization with corrected geomagnetic latitude is determined. Then, for each 15 min interval, magnetic activity on the horizontal component is averaged out over 15 min and corrected using this normalization, before a spline modeling of the longitudinal variation in each hemisphere is applied. Hemispheric and planetary 15 min indices are then computed by arithmetic means. Preliminary statistical results, from probability distribution function over a solar cycle and superposed epoch analysis during storms conditions, show, by comparison with am geomagnetic index series, that new 15 indices are reliable in describing subauroral magnetic activity. These new indices will suit any future user, allowing either to choose the spatial description (planetary versus hemispheric) and/or to choose the temporal resolution, knowing unambiguously all their strengths and caveats. SN - 2169-9402 UR - http://dx.doi.org/10.1002/2015JA021479 N1 - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=6228), last updated on Wed, 03 Jul 2024 22:00:26 +0200 ID - ChambodutAude_etal2015 ER -