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2020 |
Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) Brückner, Marlen; Lonardi, Michael; Ehrlich, Andr\; Wendisch, Manfred; Jäkel, Evelyn; Schäfer, Michael; Quaas, Johannes; Kalesse, Heike; Published by: Published on: |
2012 |
Diamagnetic effects of ionospheric irregularities have been investigated at low-latitudes before, but no corresponding effort has been made at high latitudes. In this study we demonstrate clear diamagnetic signatures of high-latitude ionospheric irregularities as observed by the CHAMP satellite. We also present the climatology of these diamagnetic signatures for the years 2001\textendash2010 and compare it with a previous study based on Global Positioning System (GPS) scintillation measurements. The climatology of the diamagnetic signatures is in reasonable agreement with that of the scintillations. The occurrence rate of the ionospheric irregularities generally peaks along the auroral latitudes around the pole, but it is not uniform zonally. The occurrence rate exhibits a maximum at the dayside cusp and in the pre-midnight ionosphere. The occurrence rate increases with solar and/or auroral activity. The region of high occurrence rate expands equatorward with increasing auroral activity. Occurrence probabilities are higher in local winter than in local summer. The overall occurrence rate is smallest around June solstice and largest around December solstice. The ionospheric irregularities are generally accompanied by bursts of small-scale field-aligned currents (FACs), and they are related to Region 1 FACs. Park, Jaeheung; Ehrlich, Robert; ühr, Hermann; Ritter, Patricia; Published by: Journal of Geophysical Research Published on: 10/2012 YEAR: 2012   DOI: 10.1029/2012JA018166 diamagnetic effect; high-latitude ionosphere; plasma density irregularity |
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