Autor(es)

Alves, M. V. ; Echer, E. ; Gonzalez, W. D.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS; v. 73, n. 11-12, p. 5-pg., 2011-07-01.

Resumo

We address the geoeffectiveness of three interplanetary structures in the interplanetary space: magnetic clouds (MCs), interplanetary shocks (IPSs), and corotating interaction regions (CIRs). The geoeffectiveness is evaluated using the geomagnetic indices Kp. AE, and Dst. We find that MCs are more geoeffective than IPSs, or CIRs. The average values of magnetic indices are significantly enhanced during disturbed periods associated with MCs, IPSs and CIRs, compared to the whole interval. The highest effect is noted for MC disturbed periods. Results obtained for the three data sets are used to derive a theoretical (continuous) probability distribution function (PDF) by fitting the histograms representing the percentage of events against the intervals of magnetic index. PDFs allow estimation of the probability of a given level of geomagnetic activity to be reached after the detection, by in situ solar wind observations, of a given interplanetary structure approaching the Earth. (C) 2010 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