Seasonal Variation of High-Latitude Geomagnetic Activity in Individual Years

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Tanskanen, E. I. Hynönen, R. Mursula, K. 2018-02-09T10:02:06Z 2018-02-09T10:02:06Z 2017-11-21
dc.identifier.citation Tanskanen , E I , Hynönen , R & Mursula , K 2017 , ' Seasonal Variation of High-Latitude Geomagnetic Activity in Individual Years ' Journal of Geophysical Research: Space Physics , vol 122 , no. 10 , pp. 10,058–10,071 . DOI: 10.1002/2017JA024276 en
dc.identifier.issn 2169-9380
dc.identifier.issn 2169-9402
dc.identifier.other PURE UUID: 9327c08b-1ca3-4259-af8f-a830d27f87ea
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE LINK:
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dc.description.abstract We study the seasonal variation of high-latitude geomagnetic activity in individual years in 1966-2014 (solar cycles 20-24) by identifying the most active and the second most active season based on westward electrojet indices AL (1966-2014) and IL (1995-2014). The annual maximum is found at either equinox in two thirds and at either solstice in one third of the years examined. The traditional two-equinox maximum pattern is found in roughly one fourth of the years. We found that the seasonal variation of high-latitude geomagnetic activity closely follows the solar wind speed. While the mechanisms leading to the two-equinox maxima pattern are in operation, the long-term change of solar wind speed tends to mask the effect of these mechanisms for individual years. Large cycle-to-cycle variation is found in the seasonal pattern: equinox maxima are more common during cycles 21 and 22 than in cycles 23 or 24. Exceptionally long winter dominance in high-latitude activity and solar wind speed is seen in the declining phase of cycle 23, after the appearance of the long-lasting low-latitude coronal hole. en
dc.format.extent 14
dc.format.extent 10,058–10,071
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Journal of Geophysical Research: Space Physics en
dc.relation.ispartofseries Volume 122, issue 10 en
dc.rights openAccess en
dc.subject.other Geophysics en
dc.subject.other Oceanography en
dc.subject.other Forestry en
dc.subject.other Aquatic Science en
dc.subject.other Ecology en
dc.subject.other Condensed Matter Physics en
dc.subject.other Water Science and Technology en
dc.subject.other Soil Science en
dc.subject.other Geochemistry and Petrology en
dc.subject.other Earth-Surface Processes en
dc.subject.other Physical and Theoretical Chemistry en
dc.subject.other Polymers and Plastics en
dc.subject.other Atmospheric Science en
dc.subject.other Earth and Planetary Sciences (miscellaneous) en
dc.subject.other Space and Planetary Science en
dc.subject.other Materials Chemistry en
dc.subject.other Palaeontology en
dc.subject.other 1171 Geosciences en
dc.title Seasonal Variation of High-Latitude Geomagnetic Activity in Individual Years en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Electronics and Nanoengineering
dc.contributor.department University of Oulu
dc.subject.keyword Decadal time scales
dc.subject.keyword Geomagnetic activity
dc.subject.keyword Seasonal variation
dc.subject.keyword Solar cycle-to-cycle variation
dc.subject.keyword Solar wind-magnetosphere coupling
dc.subject.keyword Sun-Earth coupling
dc.subject.keyword Geophysics
dc.subject.keyword Oceanography
dc.subject.keyword Forestry
dc.subject.keyword Aquatic Science
dc.subject.keyword Ecology
dc.subject.keyword Condensed Matter Physics
dc.subject.keyword Water Science and Technology
dc.subject.keyword Soil Science
dc.subject.keyword Geochemistry and Petrology
dc.subject.keyword Earth-Surface Processes
dc.subject.keyword Physical and Theoretical Chemistry
dc.subject.keyword Polymers and Plastics
dc.subject.keyword Atmospheric Science
dc.subject.keyword Earth and Planetary Sciences (miscellaneous)
dc.subject.keyword Space and Planetary Science
dc.subject.keyword Materials Chemistry
dc.subject.keyword Palaeontology
dc.subject.keyword 1171 Geosciences
dc.identifier.urn URN:NBN:fi:aalto-201802091406
dc.identifier.doi 10.1002/2017JA024276 info:eu-repo/date/embargoEnd/2018-05-22

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