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Influence of Atmospheric Circulation on Orientation of Auroral Arcs
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2023 (Engelska)Ingår i: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 128, nr 7Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We investigated statistically the orientation of about 10,000 auroral arcs observed during 2016?2021 in Abisko (68.36°N, 18.81°E, Sweden) in the equatorward part of the nightside auroral oval. The observations were made between 19 and 06 magnetic local time (MLT). On average, the orientation of the arcs, that is, the angle between an arc and the West-East direction, linearly changed with MLT at the rate 2.2°/hr. In most cases the mean orientation of the auroral arcs near midnight was parallel to the geomagnetic latitude of Abisko, except a few late winter or spring months. These anomalies cannot be explained by geomagnetic disturbances or interplanetary conditions. They do, however, coincide with spring transitions in the atmospheric circulations from winter-to summer-type. The spring transitions were manifested in the data of a meteor radar in the region of observations as reversals of the zonal wind at altitudes 90?100 km from eastward to westward. We propose that these spring transition changes in the global atmospheric circulation couple also the overlying thermosphere at 100?150 km where neutral winds may affect the ionosphere and subsequently the whole ionosphere-magnetosphere system. Then, changes in the coupled ionosphere-magnetosphere system are manifested in changes of the orientation of auroral arcs.

Ort, förlag, år, upplaga, sidor
John Wiley & Sons, Ltd , 2023. Vol. 128, nr 7
Nyckelord [en]
auroral arcs, atmospheric circulation, meteor radar
Nationell ämneskategori
Fusion, plasma och rymdfysik Meteorologi och atmosfärforskning
Identifikatorer
URN: urn:nbn:se:polar:diva-9014DOI: 10.1029/2023JA031294OAI: oai:DiVA.org:polar-9014DiVA, id: diva2:1820093
Tillgänglig från: 2023-12-15 Skapad: 2023-12-15 Senast uppdaterad: 2023-12-15Bibliografiskt granskad

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Förlagets fulltexthttps://doi.org/10.1029/2023JA031294
I samma tidskrift
Journal of Geophysical Research - Space Physics
Fusion, plasma och rymdfysikMeteorologi och atmosfärforskning

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