Annual variations in westward auroral electrojet and substorm occurrence rate during solar cycle 23

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Guo, Jianpeng
dc.contributor.author Pulkkinen, Tuija I.
dc.contributor.author Tanskanen, E. I.
dc.contributor.author Feng, Xueshang
dc.contributor.author Emery, Barbara A.
dc.contributor.author Liu, Huixin
dc.contributor.author Liu, Chaoxu
dc.contributor.author Zhong, Dingkun
dc.date.accessioned 2015-03-30T09:00:41Z
dc.date.available 2015-03-30T09:00:41Z
dc.date.issued 2014
dc.identifier.citation Guo, Jianpeng & Pulkkinen, Tuija I. & Tanskanen, E. I. & Feng, Xueshang & Emery, Barbara A. & Liu, Huixin & Liu, Chaoxu & Zhong, Dingkun. 2014. Annual variations in westward auroral electrojet and substorm occurrence rate during solar cycle 23. Journal of Geophysical Research: Space physics, Vol. 119, nro 3. pp. 2061-2068. 2169-9402 (electronic). DOI: 10.1002/2013JA019742. en
dc.identifier.issn 2169-9402 (electronic)
dc.identifier.issn 2169-9380 (printed)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/15436
dc.description.abstract The International Monitor for Auroral Geomagnetic Effects network magnetic measurements during the period 1995–2009 are used to characterize the annual variations in the westward electrojet. The results suggest that the annual variations in different local time sectors are quite different due to the different sources. In the MLT sector 2200–0100, the annual variations with maxima in winter suggest they are caused by the combined effects of the convective electric field and the conductivity associated with particle precipitation. Furthermore, the conductivity seems to play a more important role in the MLT sector ∼2200–2320, while the convective electric field appears to be more important in the MLT sector ∼2320–0100. In the MLT sector 0300–0600, the annual variations with maxima in summer suggest they are caused by solar EUV conductivity effect and the equinoctial effect. The solar EUV conductivity effect works by increasing ionospheric conductivity and enhancing the westward electrojet in summer, while the equinoctial effect works by decreasing solar wind-magnetosphere coupling efficiency and weakening the westward electrojet in winter. In the MLT sector 0100–0300, the annual variations are relatively weak and can be attributed to the combined effects of annual variations caused by all the previously mentioned effects. In addition, we find that a significant annual variation in substorm occurrence rate, mainly occurring in the premidnight region, is quite similar to that in the westward electrojet. We suggest that elevated solar wind driving during the winter months contributes to higher substorm occurrence in winter in the Northern Hemisphere. en
dc.format.extent pp. 2061-2068
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Geophysical Union. Wiley en
dc.relation.ispartofseries Journal of Geophysical Research: Space physics, Vol. 119, nro 3 en
dc.subject.other Space technology en
dc.title Annual variations in westward auroral electrojet and substorm occurrence rate during solar cycle 23 en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.rights.holder American Geophysical Union. Wiley
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.contributor.school School of Electrical Engineering en
dc.subject.keyword solar wind driving en
dc.subject.keyword annual variation en
dc.subject.keyword westward electrojet en
dc.subject.keyword substorm en
dc.identifier.urn URN:NBN:fi:aalto-201503262095
dc.type.dcmitype text en
dc.identifier.doi 10.1002/2013JA019742


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