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El-Lemdani Mazouz F., M. Menvielle, A. Chambodut, A. Marchaudon, C. Lathuillière. (2012). Variation statistique des indices d’activités géomagnétique sectoriels.
Abstract: colloque du PNST, La Londe Les Maures, France.
Programme: 905
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Febvre, P., E. Pozzo di Borgo, A. Chambodut, C. Fourie, E. Saunderson, D. Gouws, S. Bernard, A. Cavaillou, J. Poupeney, D. Boyer, C. Sudre . (2012). Towards an international network of superconducting magnetometers for geomagnetic and Earth-Ionosphere studies.
Abstract: IDUST conference, Apt, France.
Programme: 905
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Kusumita Arora, Aude Chambodut and Barbara Leichter . (2013). RECENT MAGNETIC SURVEYS FOR REGIONAL AND GLOBAL CHARACTERIZATION OF THE GEOMAGNETIC FIELD.
Abstract: IAGA 2013, aout 2013, Merida, Mexique.
Over the past decades, geophysical surveys of the Earth’s magnetic field have been significantly advanced through the use of satellite technology permitting global field characterization. Large-scale airborne, land and marine geomagnetic surveys remain an important source for detailed regional near surface data. The combination of remote sensing and ground survey measurements through generation of seamless digital grids has resulted in new data sets describing crustal magnetic anomalies across many regions of the globe.
This talk is a review of the studies presented during the session 5.2. It focuses on applications and case studies of geomagnetic surveys providing surface (land and marine) and airborne magnetic data, as well as the interpretation of this data with respect to the spatial and temporal evolution of the Earth’s magnetic field.
Programme: 905
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Aude Chambodut and Michel Menvielle . (2013). LONGITUDINAL SECTORIAL INDICES COMPARED WITH PLANETARY K INDEX.
Abstract: IAGA 2013, aout 2013, Merida, Mexique.
The planetary three-hour range Kp index was introduced by J. Bartels in 1949. Kp is the average of standardized K-index from 13 observatories between 44° and 60° northern or southern geomagnetic latitude: 11 of them are located in North America and Europe and 2 in Australia and New Zealand. Such a distribution of the Kp observatories results in a UT dependent statistical bias in the estimate of planetary geomagnetic activity, since the geomagnetic activity intensity varies with Local Time. In this paper, we took advantage of the recent developments on sectorial indices to better characterize the description of planetary geomagnetic activity provided by Kp.
Programme: 905
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Chambodut, Aude; Lathuillère, Chantal; Menvielle, Michel; Marchaudon, Aurélie; El-Lemdani Mazouz, Farida; Boscher, Daniel; Rochel Grimald, Sandrine. (2013). Derivation and properties of new geomagnetic indices and their use in Space Weather applications..
Abstract: IAGA 2013, aout 2013, Merida, Mexique.
A great number of Space Weather applications rely on K-derived planetary geomagnetic indices. These indices, namely Kp/ap or Km/am (depending on the number of used subauroral geomagnetic stations) are therefore limited to the 3-hour time resolution of K indices. In addition, they do not represent the intrinsic spatial variations that result from the local time dependency of the solar wind/magnetosphere interaction.
We have defined new geomagnetic indices, based on the magnetic variations recorded in the am network of ground based observatories, with a better time resolution and/or a better spatial resolution. Using the root mean square of the horizontal magnetic variations, instead of the 3-hour K indices, we have calculated !m indices with different time resolution down to 15 minutes.
On another hand, the better spatial resolution is achieved by considering sector indices defined with respect to the Magnetic Local Time, the so called MLT sectorial indices. The properties of theses new indices will be presented. As an application, we will present their possible use in thermosphere modelling. We will also present how the !m index brings new information in the study of the dynamic of the magnetosphere and of the inner magnetosphere.
Programme: 905
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Chambodut A, Marchaudon A, Menvielle M, El-Lemdani Mazouz F, Lathuillére C, . (2013). The K-derived MLT sector geomagnetic indices
. GEOPHYSICAL RESEARCH LETTERS, 40(18), 4808–4812.
Keywords: 1530 Rapid time variations, 1555 Time variations: diurnal to decadal, 2784 Solar wind/magnetosphere interactions, 7954 Magnetic storms, geomagnetic indices, MLT sector (Magnetic Local Time sector),
Programme: 905
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Goutail F., Pommereau J.P., Phillips C., Deniel C., Sarkissian A., Lefevre F., Kyro E., Rummukainen M., Ericksen P., Andsersen S.B.,et al. (1999). Depletion of column ozone in the Arctic during the winters of 1993-94 and 1994-95. Journal of atmospheric chemistry, 32.
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Roscoe H.K., Johnston P.V., Van Roozendael M., Richter A., Preston K.; Lambert J.C. et al. (1999). Slant column measurements of O3 and NO2 during the NDSC intercomparison of zenith-sky UV-visible spectrometers in June 1996. Journal of atmospheric chemistry, 32, 281–314.
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Ricaud P., Monnier E., Goutail F., Pommereau J.P., David C., Godin S., Froidevaux L., Waters J.W., Mergenthaler J., Roche A.E., Pumphrey H. & Chippeerfield M.P. (1998). Stratosphere over Dumont d'Urville, Antarctica, in winter 1992. J. Geophys. Res., 103(d11), 13267–13284.
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Lambert J.C., Van Roozendael M., De Aziere M., Simon P.C., Pommereau J.P., Goutail F., Sarkissian A. & Gleason J.F. (1998). Investigation of to pole-to pole performances of space-borne atmospheric chemistry sensors with ground-based networks. Journal of the atmospheric sciences, 56, 176–193.
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