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Effect of Polar Cap Patches on the High-Latitude Upper Thermospheric Winds
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- Cai, L. (författare)
- Space Physics and Astronomy, University of Oulu, Oulu, Finland
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- Aikio, A. (författare)
- Space Physics and Astronomy, University of Oulu, Oulu, Finland
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- Oyama, S. (författare)
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan; National Institute of Polar Research, Tachikawa, Japan
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- John Wiley and Sons Inc, 2024
- 2024
- Engelska.
- Ingår i: Journal of Geophysical Research - Space Physics. - : John Wiley and Sons Inc. - 2169-9380 .- 2169-9402. ; 129:8
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- This study focuses on the poorly known effect of polar cap patches (PCPs) on the ion-neutral coupling in the F-region. The PCPs were identified by total electron content measurements from the Global Navigation Satellite System (GNSS) and the ionospheric parameters from the Defense Meteorological Satellite Program spacecraft. The EISCAT incoherent scatter radars on Svalbard and at Tromsø, Norway observed that PCPs entered the nightside auroral oval from the polar cap and became plasma blobs. The ionospheric convection further transported the plasma blobs to the duskside. Simultaneously, long-lasting strong upper thermospheric winds were detected in the duskside auroral oval by a Fabry-Perot Interferometer (FPI) at Tromsø and in the polar cap by the Gravity Recovery and Climate Experiment satellite. Using EISCAT ion velocities and plasma parameters as well as FPI winds, the ion drag acting on neutrals and the time constant for the ion drag could be estimated. Due to the arrival of PCPs/blobs and the accompanied increase in the F-region electron densities, the ion drag is enhanced between about 220 and 500 km altitudes. At the F peak altitudes near 300 km, the median ion drag acceleration affecting neutrals more than doubled and the associated median e-folding time decreased from 4.4 to 2 hr. The strong neutral wind was found to be driven primarily by the ion drag force due to large-scale ionospheric convection. Our results provide a new insight into ionosphere-thermosphere coupling in the presence of PCPs/blobs.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- blobs
- high-latitude electrodynamics
- ion-neutral coupling
- ionosphere-thermosphere
- polar cap patches
- upper thermospheric wind
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- Cai, L.
- Aikio, A.
- Oyama, S.
- $$$Ivchenko, N.
- Vanhamäki, H.
- Virtanen, I.
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- Buchert, S.
- Mekuriaw, M. L.
- Zhang, Y.
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