Blar i Bergen Open Research Archive på forfatter "Oksavik, Kjellmar"
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A space hurricane over the Earth’s polar ionosphere
Zhang, Qing-He; Zhang, Yong-Liang; Wang, Chi; Oksavik, Kjellmar; Lyons, Larry R.; Lockwood, Michael; Yang, Hui-Gen; Tang, Bin-Bin; Moen, Jøran Idar; Xing, Zan-Yang; Ma, Yu-Zhang; Wang, Xiang-Yu; Ning, Ya-Fei; Xia, Li-Dong (Journal article; Peer reviewed, 2021)In Earth’s low atmosphere, hurricanes are destructive due to their great size, strong spiral winds with shears, and intense rain/precipitation. However, disturbances resembling hurricanes have not been detected in Earth’s ... -
Space weather challenges of the polar cap ionosphere
Moen, Jøran Idar; Oksavik, Kjellmar; Alfonsi, Lucilla; Dåbakk, Yvonne Rinne; Romano, Vineenzo; Spogli, Luca (Peer reviewed; Journal article, 2013)This paper presents research on polar cap ionosphere space weather phenomena conducted during the European Cooperation in Science and Technology (COST) action ES0803 from 2008 to 2012. The main part of the work has been ... -
A statistical study of polar cap flow channels and their IMF by dependence
Herlingshaw, Katie; Baddeley, Lisa; Oksavik, Kjellmar; Lorentzen, Dag Arne (Journal article; Peer reviewed, 2020)An algorithm to detect high-speed ionospheric flow channels (FCs) in the polar cap was applied to data from the Longyearbyen radar of the Super Dual Auroral Radar Network. The Longyearbyen radar is at high latitude (78.2°N, ... -
A statistical study of polar cap flow channels observed in both hemispheres using SuperDARN radars
Herlingshaw, Katie; Baddeley, Lisa; Oksavik, Kjellmar; Lorentzen, Dag Arne; Laundal, Karl Magnus (Journal article; Peer reviewed, 2022)This paper details the first large-scale, interhemispheric statistical study into ionospheric fast flow (>900 m/s) channels in the polar cap using the SuperDARN radar network. An automatic algorithm was applied to 6 years ... -
Statistical Study of the Relationship Between Ion Upflow and Field-Aligned Current in the Topside Ionosphere for Both Hemispheres During Geomagnetic Disturbed and Quiet Time
Ma, Yu-Zhang; Zhang, Qing-He; Jayachandran, Periyadan T.; Oksavik, Kjellmar; Lyons, Lawrence R.; Xing, Zan-Yang; Zhou, Shan-Yu; Hairston, Marc; Wang, Yong (Journal article; Peer reviewed, 2020)A statistical study of ion upflow and field‐aligned currents (FACs) has been performed in the topside ionosphere of both hemispheres for magnetic quiet and disturbed times by using DMSP satellite observations from 2010–2013. ... -
A Study of Automatically Detected Flow Channels in the Polar Cap Ionosphere
Herlingshaw, Katie; Baddeley, Lisa; Oksavik, Kjellmar; Lorentzen, Dag Arne; Bland, Emma (Peer reviewed; Journal article, 2019-11-13)This paper presents a new algorithm for detecting high‐speed flow channels in the polar cap. The algorithm was applied to Super Dual Auroral Radar Network data, specifically to data from the new Longyearbyen radar. This ... -
Unusual shrinkage and reshaping of Earth’s magnetosphere under a strong northward interplanetary magnetic field
Wang, Xiang-Yu; Zhang, Qing-He; Wang, Chi; Zhang, Yong-Liang; Tang, Bin-Bin; Xing, Zan-Yang; Oksavik, Kjellmar; Lyons, Larry R.; Lockwood, Michael; Zong, Qiu-Gang; Li, Guo-Jun; Liu, Jing; Ma, Yu-Zhang; Wang, Yong (Journal article; Peer reviewed, 2023)The Earth’s magnetosphere is the region of space where plasma behavior is dominated by the geomagnetic field. It has a long tail typically extending hundreds of Earth radii (RE) with plentiful open magnetic fluxes threading ...