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Found 5 entries in the Bibliography.
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2018 |
Polar cap patch signatures during geomagnetic disturbed conditions Published by: Published on: |
2017 |
We present a multiinstrumented approach for the analysis of the Arctic ionosphere during the 19 February 2014 highly complex, multiphase geomagnetic storm, which had the largest impact on the disturbance storm-time index that year. The geomagnetic storm was the result of two powerful Earth-directed coronal mass ejections (CMEs). It produced a strong long lasting negative storm phase over Greenland with a dominant energy input in the polar cap. We employed global navigation satellite system (GNSS) networks, geomagnetic observatories, and a specific ionosonde station in Greenland. We complemented the approach with spaceborne measurements in order to map the state and variability of the Arctic ionosphere. In situ observations from the Canadian CASSIOPE (CAScade, Smallsat and Ionospheric Polar Explorer) satellite\textquoterights ion mass spectrometer were used to derive ion flow data from the polar cap topside ionosphere during the event. Our research specifically found that (1) thermospheric O/N 2 measurements demonstrated significantly lower values over the Greenland sector than prior to the storm time. (2) An increased ion flow in the topside ionosphere was observed during the negative storm phase. (3) Negative storm phase was a direct consequence of energy input into the polar cap. (4) Polar patch formation was significantly decreased during the negative storm phase. This paper addresses the physical processes that can be responsible for this ionospheric storm development in the northern high latitudes. We conclude that ionospheric heating due to the CME\textquoterights energy input caused changes in the polar atmosphere resulting in N e upwelling, which was the major factor in high-latitude ionosphere dynamics for this storm. Durgonics, Tibor; Komjathy, Attila; Verkhoglyadova, Olga; Shume, Esayas; Benzon, Hans-Henrik; Mannucci, Anthony; Butala, Mark; H\oeg, Per; Langley, Richard; Published by: Radio Science Published on: 01/2017 YEAR: 2017   DOI: 10.1002/2016RS006106 |
The main focus of this dissertation is the study of the physical processes in the northern high-latitude (or simply Arctic) ionosphere. In addition to the main focus, two further studies are also presented regarding midlatitude ionosphere and neutral atmospheric simulations and observations. This section presents some basic background and the motivation behind these research topics. Durgonics, Tibor; H\oeg, P; Olsen, N; Coster, AJ; Wintoft, P; Komjathy, A; von Benzon, H; Published by: Published on: |
2016 |
Durgonics, Tibor; Komjathy, Attila; Verkhoglyadova, Olga; Hoeg, Per; Paul, Ashik; Published by: Published on: |
Multi-Instrument Observations of Geomagnetic Storms in the Arctic Ionosphere Durgonics, Tibor; Komjathy, Attila; Verkhoglyadova, Olga; Shume, Esayas; Benzon, Hans-Henrik; Mannucci, Anthony; Butala, Mark; H\oeg, Per; Langley, Richard; Published by: Published on: |
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