High-intensity, long-duration, continuous AE activity events associated with Alfvenic fluctuations in 2003

Autor(es)

Prestes, Alan ^[1] ; Klausner, Virginia ^[1] ; Ojeda-Gonzalez, Arian ^[1]

Afiliação do(s) autor(es)

^[1] Vale do Paraiba Univ UNIVAP, BR-12244000 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Annales Geophysicae; v. 35, n. 6, p. 1231-1240, NOV 13 2017.
• Citações Web of Science: 3

Resumo

The interaction between a fast-speed and a low-speed stream causes large-amplitude Alfvenic fluctuations; consequently, the intermittency and the brief intervals of southward magnetic field associated with Alfven waves may cause high levels of AE activity, the so-called high-intensity, long-duration, continuous AE activity (HILD-CAA). In this article, the 4 h windowed Pearson cross-correlation (4WPCC) between the solar wind velocity and the interplanetary magnetic field (IMF) components is performed in order to confirm that the less strict HILDCAA (HILDCAAs{*}) events include a larger number of Alfven waves than the HILDCAA events, once HILDCAAs disregard part of the phenomenon. Actually, a HILDCAA event is entirely contained within a HILDCAA{*} event. However, the opposite is not necessarily true. This article provides a new insight, since the increase of Alfven waves results in an increase of auroral electrojet activity; consequently, it can cause HILDCAAs{*} events. Another important aspect of this article is that the superposed epoch analysis (SEA) results reaffirm that the HILDCAAs{*} are associated with high-speed solar streams (HSSs), and also the HILDCAAs{*} present the same physical characteristics of the traditional HILDCAA events. (AU)

• Processo FAPESP: 09/02907-8 - Estudo das inter-relações sol-terra-clima por meio de registros observacionais e naturais
• Beneficiário: Alan Prestes
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores