| Full text | |
| Author(s): |
Total Authors: 3
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| Affiliation: | [1] Vale do Paraiba Univ UNIVAP, BR-12244000 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 1
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| Document type: | Journal article |
| Source: | Annales Geophysicae; v. 35, n. 6, p. 1231-1240, NOV 13 2017. |
| Web of Science Citations: | 3 |
| Abstract | |
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) | |
| FAPESP's process: | 09/02907-8 - Study sun-earth-climate inter-relationship by means of observation and natural registers |
| Grantee: | Alan Prestes |
| Support Opportunities: | Research Grants - Young Investigators Grants |