Autor(es)

Echer, E. ; Gonzalez, W. D. ; Tsurutani, B. T.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS; v. 73, n. 11-12, p. 6-pg., 2011-07-01.

Resumo

A catalog of 1377 geomagnetic storms with peak Dst (Dst(p)) <= -50 nT for the period 1957-2008 has been compiled. The dependence of Dst(p) on the solar cycle and annual variation are studied in this paper. It is found that geomagnetic storm peak intensity distribution can be described by an exponential form, P(Dst(p)) approximate to 1.2e(-Dstp/34) where P is the probability of geomagnetic storm occurrence with a given value Dstp. The updated solar cycle and annual distribution of geomagnetic storms have confirmed the expected behavior. For the solar cycle variation, geomagnetic storms display a two-peak distribution, with one peak close to solar maximum and the other a few years later in the beginning of the declining phase. Geomagnetic storms follow the well-known seasonal variation of geomagnetic activity. More intense storms show a peak in probability occurrence in July, confirming previous observations. These results are of practical importance for space weather applications. (C) 2011 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 08/06650-9 - Estudo de estruturas interplanetárias geoefetivas durante tempestades e subtempestades geomagnéticas intensas
• Beneficiário: Walter Demetrio Gonzalez Alarcon
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 07/52533-1 - Estudo de ondas de plasma em magnetosferas planetárias
• Beneficiário: Ezequiel Echer
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores