High-latitude ion temperature climatology during the International Polar Year 2007-2008

Yamazaki, Yosuke and Kosch, Michael Jurgen and Ogawa, Yasunobu and Themens, David (2016) High-latitude ion temperature climatology during the International Polar Year 2007-2008. Journal of Space Weather and Space Climate, 6. ISSN 2115-7251

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Abstract

This article presents the results of an ion temperature climatology study that examined ionospheric measurements from the European Incoherent SCATter (EISCAT) Svalbard Radar (ESR: 78.2° N, 16.0° E) and the Poker Flat Incoherent Scatter Radar (PFISR: 65.1° N, 212.6° E) during the year-long campaign of the International Polar Year (IPY) from March 2007 to February 2008. These observations were compared with those of the Thermosphere Ionosphere Electrodynamics General Circulation Model (TIE-GCM), as well as the International Reference Ionosphere 2012 (IRI-2012). Fairly close agreement was found between the observations and TIE-GCM results. Numerical experiments revealed that the daily variation in the high-latitude ion temperature, about 100–200 K, is mainly due to ion frictional heating. The ion temperature was found to increase in response to elevated geomagnetic activity at both ESR and PFISR, which is consistent with the findings of previous studies. At ESR, a strong response occurred during the daytime, which was interpreted as a result of dayside-cusp heating. Neither TIE-GCM nor IRI-2012 reproduced the strong geomagnetic activity response at ESR, underscoring the need for improvement in both models at polar latitudes.

Item Type: Journal Article
Journal or Publication Title: Journal of Space Weather and Space Climate
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1900/1902
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 81896
Deposited By: ep_importer_pure
Deposited On: 04 Oct 2016 09:26
Refereed?: Yes
Published?: Published
Last Modified: 23 Oct 2019 01:42
URI: https://eprints.lancs.ac.uk/id/eprint/81896

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