Lasse Clausen

• Chernyshov, Aleksander A.; Spicher, Andres; Ilyasov, Askar A.; Miloch, Wojciech Jacek; Clausen, Lasse Boy Novock; Saito, Yoshifumi; Jin, Yaqi & Moen, Jøran Idar (2018). Studies of small-scale plasma inhomogeneities in the cusp ionosphere using sounding rocket data. Physics of Plasmas.  ISSN 1070-664X.  25(4) . doi: 10.1063/1.5026281
• D'Angelo, Giulia; Piersanti, Mirko; Alfonsi, Lucilla; Spogli, Luca; Clausen, Lasse Boy Novock; Coco, Igino; Li, Guozhu & Baiqi, Ning (2018). The response of high latitude ionosphere to the 2015 St. Patrick's day storm from in situ and ground based observations. Advances in Space Research.  ISSN 0273-1177.  62(3), s 638- 650 . doi: 10.1016/j.asr.2018.05.005
• Hoang, Huy Minh; Clausen, Lasse Boy Novock; Røed, Ketil; Bekkeng, Tore Andre; Trondsen, Espen; Lybekk, Bjørn; Strøm, Halvor; Bang-Hauge, David Michael; Pedersen, Arne; Spicher, Andres & Moen, Jøran Idar (2018). The Multi-Needle Langmuir Probe System on Board NorSat-1. Space Science Reviews.  ISSN 0038-6308.  214(4) . doi: 10.1007/s11214-018-0509-2
• Hoang, Huy Minh; Røed, Ketil; Bekkeng, Tore Andre; Moen, Jøran Idar; Spicher, Andres; Clausen, Lasse Boy Novock; Miloch, Wojciech Jacek; Trondsen, Espen & Pedersen, Arne (2018). A study of data analysis techniques for the multi-needle Langmuir probe. Measurement science and technology.  ISSN 0957-0233.  29(6) . doi: 10.1088/1361-6501/aab948
• Hoang, Huy Minh; Røed, Ketil; Bekkeng, Tore Andre; Trondsen, Espen; Clausen, Lasse Boy Novock; Miloch, Wojciech Jacek & Moen, Jøran Idar (2017). High spatial-resolution electron density measurement by Langmuir probe for multi-point observations using tiny spacecraft. Measurement science and technology.  ISSN 0957-0233.  28(11) . doi: 10.1088/1361-6501/aa87e1
• Jin, Yaqi; Moen, Jøran Idar; Oksavik, Kjellmar; Spicher, Andres; Clausen, Lasse Boy Novock & Miloch, Wojciech Jacek (2017). GPS scintillations associated with cusp dynamics and polar cap patches. Journal of Space Weather and Space Climate.  ISSN 2115-7251.  7 . doi: 10.1051/swsc/2017022 Full text in Research Archive. Show summary

  This paper investigates the relative scintillation level associated with cusp dynamics (including precipitation, flow shears, etc.) with and without the formation of polar cap patches around the cusp inflow region by the EISCAT Svalbard radar (ESR) and two GPS scintillation receivers. A series of polar cap patches were observed by the ESR between 8:40 and 10:20 UT on December 3, 2011. The polar cap patches combined with the auroral dynamics were associated with a significantly higher GPS phase scintillation level (up to 0.6 rad) than those observed for the other two alternatives, i.e., cusp dynamics without polar cap patches, and polar cap patches without cusp aurora. The cusp auroral dynamics without plasma patches were indeed related to GPS phase scintillations at a moderate level (up to 0.3 rad). The polar cap patches away from the active cusp were associated with sporadic and moderate GPS phase scintillations (up to 0.2 rad). The main conclusion is that the worst global navigation satellite system space weather events on the dayside occur when polar cap patches enter the polar cap and are subject to particle precipitation and flow shears, which is analogous to the nightside when polar cap patches exit the polar cap and enter the auroral oval.

• Milan, Stephen Eric; Clausen, Lasse Boy Novock; Coxon, John Charles; Carter, Jenny A.; Walach, Maria Theresia; Laundal, Karl Magnus; Østgaard, Nikolai; Tenfjord, Paul Arne Riksheim; Reistad, Jone Peter; Snekvik, Kristian; Korth, Haje & Anderson, Brian J. (2017). Overview of solar wind - magnetosphere - ionosphere - atmosphere coupling and the generation of magnetospheric currents. Space Science Reviews.  ISSN 0038-6308.  206(1), s 547- 573 . doi: 10.1007/s11214-017-0333-0
• Spicher, Andres; Clausen, Lasse Boy Novock; Miloch, Wojciech Jacek; Lofstad, Victoria; Jin, Yaqi & Moen, Jøran Idar (2017). Interhemispheric study of polar cap patch occurrence based on Swarm in situ data. Journal of Geophysical Research - Space Physics.  ISSN 2169-9380. . doi: 10.1002/2016JA023750
• Wu, J.; Bryant, Mark S; Ridley, CG; Shen, Y; Yang, Lei; Clausen, Lasse Boy Novock; McWilliams, Kathryn A.; Murphy, Kyle R; Mann, Ian R.; Ozeke, Louis G; Korth, Haje; Anderson, Brian J. & Waters, Colin L. (2017). A comparison of small-scale magnetic fluctuations in the Region 1 and 2 field-aligned current systems. Journal of Geophysical Research - Biogeosciences.  ISSN 2169-8953.  122(3), s 3277- 3290 . doi: 10.1002/2016JA023453
• Zhou, Xiaoyan; Haerendel, Gerhard; Moen, Jøran Idar; Trondsen, Espen; Clausen, Lasse Boy Novock; Strangeway, Robert J.; Lybekk, Bjørn & Lorentzen, Dag Arne (2017). Shock aurora: Field-aligned discrete structures moving along the dawnside oval. Journal of Geophysical Research - Space Physics.  ISSN 2169-9380.  122(3), s 3145- 3162 . doi: 10.1002/2016JA022666
• Clausen, Lasse Boy Novock; Moen, Jøran Idar; Hosokawa, Keisuke & Holmes, Jeffrey Morgan (2016). GPS scintillations in the high latitudes during periods of dayside and nightside reconnection. Journal of Geophysical Research - Biogeosciences.  ISSN 2169-8953.  121(4), s 3293- 3309 . doi: 10.1002/2015JA022199
• Cohen, I. J.; Widholm, M.; Lessard, M. R.; Riley, P; Heavisides, J.; Moen, Jøran Idar; Clausen, Lasse Boy Novock & Bekkeng, Tore Andre (2016). Rocket-borne measurements of electron temperature and density with the Electron Retarding Potential Analyzer instrument. Journal of Geophysical Research - Biogeosciences.  ISSN 2169-8953.  121(7), s 6774- 6782 . doi: 10.1002/2016JA022562
• Coxon, John C.; Milan, Steve; Carter, Jenny A.; Clausen, Lasse Boy Novock; Anderson, Brian J. & Korth, Haje (2016). Seasonal and diurnal variations in AMPERE observations of the Birkeland currents compared to modeled results. Journal of Geophysical Research - Biogeosciences.  ISSN 2169-8953.  121(5), s 4027- 4040 . doi: 10.1002/2015JA022050
• Jin, Yaqi; Moen, Jøran Idar; Miloch, Wojciech Jacek; Clausen, Lasse Boy Novock & Oksavik, Kjellmar (2016). Statistical study of the GNSS phase scintillation associated with two types of auroral blobs. Journal of Geophysical Research - Space Physics.  ISSN 2169-9380.  121(5), s 4679- 4697 . doi: 10.1002/2016JA022613
• Shukhtina, Maria A.; Gordeev, Evigini I.; Sergeev, Victor A.; Tsyganenko, Nikolai A.; Clausen, Lasse Boy Novock & Milan, Stephen Eric (2016). Magnetotail magnetic flux monitoring based on simultaneous solar wind and magnetotail observations. Journal of Geophysical Research - Biogeosciences.  ISSN 2169-8953.  121(9), s 8821- 8839 . doi: 10.1002/2016JA022911
• Smith, David M.; Casavant, Eric P; Comess, Max D; Liang, Xinqing; Bowers, Gregory S; Selesnick, Richard S; Clausen, Lasse Boy Novock; Millan, Robyn M & Sample, John G (2016). The causes of the hardest electron precipitation events seen with SAMPEX. Journal of Geophysical Research - Biogeosciences.  ISSN 2169-8953.  121(9), s 8600- 8613 . doi: 10.1002/2016JA022346
• Spicher, Andres; Ilyashov, Askar A.; Miloch, Wojciech Jacek; Chernyshov, Aleksander A.; Clausen, Lasse Boy Novock; Moen, Jøran Idar; Abe, T. & Saito, Y. (2016). Reverse flow events and small-scale effects in the cusp ionosphere. Journal of Geophysical Research - Space Physics.  ISSN 2169-9380.  121(10), s 10,466- 10,480 . doi: 10.1002/2016JA022999
• van der Meeren, Christer; Oksavik, Kjellmar; Lorentzen, Dag Arne; Paxton, Larry J. & Clausen, Lasse Boy Novock (2016). Scintillation and irregularities from the nightside part of a Sun-aligned polar cap arc. Journal of Geophysical Research - Space Physics.  ISSN 2169-9380.  121(6), s 5723- 5736 . doi: 10.1002/2016JA022708 Full text in Research Archive.
• Bjoland, Lindis Merete; Chen, Xiangcai; Jin, Yaqi; Reimer, Ashton S.; Skjæveland, Åsmund; Wessel, Matthew R.; Burchill, Jonathan K.; Clausen, Lasse Boy Novock; Haaland, Stein & McWilliams, Kathryn A. (2015). Interplanetary magnetic field and solar cycle dependence of Northern Hemisphere F region joule heating. Journal of Geophysical Research - Space Physics.  ISSN 2169-9380.  120(2), s 1478- 1487 . doi: 10.1002/2014JA020586
• Clausen, Lasse Boy Novock & Moen, Jøran Idar (2015). Electron density enhancements in the polar cap during periods of dayside reconnection. Journal of Geophysical Research - Space Physics.  ISSN 2169-9380.  120, s 4452- 4464 . doi: 10.1002/2015JA021188
• Goodwin, Lindsay; Iserhienrhien, Blessing; Miles, David M.; Patra, Swadesh; van der Meeren, Christer; Buchert, Stephan C.; Burchill, Jonathan; Clausen, Lasse Boy Novock; Knudsen, David J.; McWilliams, Kathryn A. & Moen, Jøran Idar (2015). Swarm in situ observations of F region polar cap patches created by cusp precipitation. Geophysical Research Letters.  ISSN 0094-8276.  42(4), s 996- 1003 . doi: 10.1002/2014GL062610 Full text in Research Archive.
• Moen, Jøran Idar; Hosokawa, Keisuke; Gulbrandsen, Njål & Clausen, Lasse Boy Novock (2015). On the symmetry of ionospheric polar cap patch exits around magnetic midnight. Journal of Geophysical Research - Space Physics.  ISSN 2169-9380.  120(9), s 7785- 7797 . doi: 10.1002/2014JA020914
• Spicher, Andres; Cameron, T.; Grono, E. M.; Yakymenko, K. N.; Buchert, S. C.; Clausen, Lasse Boy Novock; Knudsen, D. J.; McWilliams, K. A. & Moen, Jøran Idar (2015). Observation of polar cap patches and calculation of gradient drift instability growth times: A Swarm case study. Geophysical Research Letters.  ISSN 0094-8276.  42(2), s 201- 206 . doi: 10.1002/2014GL062590
• Spicher, Andres; Miloch, Wojciech Jacek; Clausen, Lasse Boy Novock & Moen, Jøran Idar (2015). Plasma turbulence and coherent structures in the polar cap observed by the ICI-2 sounding rocket. Journal of Geophysical Research - Space Physics.  ISSN 2169-9380.  120(12), s 10959- 10978 . doi: 10.1002/2015JA021634
• van der Meeren, Christer; Oksavik, Kjellmar; Lorentzen, Dag Arne; Rietveld, Michael T & Clausen, Lasse Boy Novock (2015). Severe and localized GNSS scintillation at the poleward edge of the nightside auroral oval during intense substorm aurora. Journal of Geophysical Research - Space Physics.  ISSN 2169-9380.  120(12), s 10607- 10621 . doi: 10.1002/2015JA021819 Show summary

  In this paper we study how GPS, GLONASS, and Galileo navigation signals are compromised by strong irregularities causing severe phase scintillation (σϕ>1) in the nightside high-latitude ionosphere during a substorm on 3 November 2013. Substorm onset and a later intensification coincided with polar cap patches entering the auroral oval to become auroral blobs. Using Global Navigation Satellite Systems (GNSS) receivers and optical data, we show severe scintillation driven by intense auroral emissions in the line of sight between the receiver and the satellites. During substorm expansion, the area of scintillation followed the intense poleward edge of the auroral oval. The intense auroral emissions were colocated with polar cap patches (blobs). The patches did not contain strong irregularities, neither before entering the auroral oval nor after the aurora had faded. Signals from all three GNSS constellations were similarly affected by the irregularities. Furthermore, two receivers spaced around 120km apart reported highly different scintillation impacts, with strong scintillation on half of the satellites in one receiver and no scintillation in the other. This shows that areas of severe irregularities in the nightside ionosphere can be highly localized. Amplitude scintillations were low throughout the entire interval.

• Clausen, Lasse Boy Novock; Milan, Steve E. & Grocott, Adrian (2014). Thermospheric density perturbations in response to substorms. Journal of Geophysical Research - Biogeosciences.  ISSN 2169-8953.  119(6), s 4441- 4455 . doi: 10.1002/2014JA019837
• Coxon, J. C.; Milan, S. E.; Clausen, Lasse Boy Novock; Anderson, B. J. & Korth, H. (2014). A superposed epoch analysis of the regions 1 and 2 Birkeland currents observed by AMPERE during substorms. Journal of Geophysical Research - Biogeosciences.  ISSN 2169-8953.  119(12), s 9834- 9846 . doi: 10.1002/2014JA020500
• Coxon, John Charles; Milan, Steve; Clausen, Lasse Boy Novock; Anderson, Brian J. & Korth, Haje (2014). The magnitudes of the regions 1 and 2 Birkeland currents observed by AMPERE and their role in solar wind-magnetosphere-ionosphere coupling. Journal of Geophysical Research - Biogeosciences.  ISSN 2169-8953.  119(12), s 9804- 9815 . doi: 10.1002/2014JA020138
• Nishimura, Yukitoshi; Lyons, Larry R.; Zou, Ying; Oksavik, Kjellmar; Moen, Jøran Idar; Clausen, Lasse Boy Novock; Donovan, Eric F.; Angelopoulos, Vassillis; Shiokawa, Kazuo; Ruohoniemi, J. Michael; Nishitani, Nozomu; McWilliams, Kathryn A. & Lester, Mark (2014). Day-night coupling by a localized flow channel visualized by polar cap patch propagation. Geophysical Research Letters.  ISSN 0094-8276.  41(11), s 3701- 3709 . doi: 10.1002/2014GL060301

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• Antonsen, Tarjei; Havnes, Ove; Latteck, Ralph; Höffner, Josef; Baumgarten, Gerd; Friedrich, Martin; Hedin, Jonas & Clausen, Lasse Boy Novock (2017). Simultaneous In Situ and Remote Observations of Dust in the Polar Summer Mesosphere: An Overview of the MAXIDUSY Campaign.
• Brinkman, D. G.; Walterscheid, R. L.; Clemmons, J.H.; Hecht, J. H.; Lessard, Marc R.; Fritz, B; Hysell, David; Clausen, Lasse Boy Novock; Moen, Jøran Idar; Oksavik, Kjellmar & Yeoman, Timothy K. (2017). High Resolution Modeling of the Thermospheric Response to Energy Inputs during the RENU-2 Rocket Flight.
• Kenward, D.; Lessard, M.; Lynch, Kristina A.; Hysell, David; Hampton, Donald L.; Michell, R.; Samara, M.; Varney, R. H.; Oksavik, Kjellmar; Clausen, Lasse Boy Novock; Hecht, J. H.; Clemmons, J.H. & Fritz, B (2017). Examination of Cross-Scale Coupling During Auroral Events using RENU2 and ISINGLASS Sounding Rocket Data.
• Moen, Jøran Idar; Oksavik, Kjellmar; Carlson, Herbert C; Stausland, Christoffer T; Clausen, Lasse Boy Novock; Daabakk, Yvonne; Spicher, Andres; Baddeley, Lisa; Lorentzen, Dag Arne; Saito, Y; Bekkeng, Tore Andre; Bekkeng, Jan Kenneth & Abe, T (2017). Kelvin Helmholtz and Gradient Drift instabilities in ionosphere cusp flow channels.
• Clausen, Lasse Boy Novock & Moen, Jøran Idar (2015). Electron density enhancement in the polar cap during periods of dayside reconnection.
• Moen, Jøran Idar; Clausen, Lasse Boy Novock; Spicher, Andres; Bekkeng, T. A.; Saito, Y.; Oksavik, Kjellmar; Baddeley, Lisa; Lorentzen, Dag Arne & Sigernes, F. (2015). Investigation of F-region auroral blobs by the ICI-4 sounding rocket.
• Spicher, Andres; Miloch, Wojciech Jacek; Moen, Jøran Idar & Clausen, Lasse Boy Novock (2015). Small-scale plasma turbulence and intermittency in the high latitude F region based on the ICI-2 sounding rocket experiment.
• Goodwin, Lindsay; Iserhienrhien, Blessing; Miles, David M.; Patra, Swadesh; van der Meeren, Christer; Buchert, S. C.; Burchill, Jonathan; Clausen, Lasse Boy Novock; Knudsen, David J.; McWilliams, Kathryn A. & Moen, Jøran Idar (2014). In situ Swarm observations of polar cap patches created by cusp precipitation.
• Goodwin, Lindsay; Iserhienrhien, Blessing; Miles, David M.; Patra, Swadesh; van der Meeren, Christer; Buchert, S. C.; Burchill, Jonathan; Clausen, Lasse Boy Novock; Knudsen, David J.; McWilliams, Kathryn A. & Moen, Jøran Idar (2014). Swarm in situ observations of F-region polar cap patches created by cusp precipitation.
• Moen, Jøran Idar; Daabakk, Yvonne; Oksavik, Kjellmar; Clausen, Lasse Boy Novock; Bekkeng, Tore Andre; Abe, T.; Saito, Y; Baddeley, Lisa; Lorentzen, Dag Arne; Sigernes, Fred & Yeoman, T. K. (2014). Plasma Instability Growth Rates in the F-Region Cusp Ionosphere.
• Moen, Jøran Idar; Hosokawa, K.; Gulbrandsen, Njål & Clausen, Lasse Boy Novock (2014). On the Symmetry of Ionospheric Polar Cap Patch Exits Around Magnetic Midnight.
• Nishimura, T.; Lyons, Larry R.; Zou, Y; Wang, B; Oksavik, Kjellmar; Moen, Jøran Idar; Clausen, Lasse Boy Novock; Donovan, E.; Angelopoulos, Vassillis; Shiokawa, K.; Ruohoniemi, J. Michael; Nishitani, Nozomu; McWilliams, Kathryn A. & Lester, Mark (2014). Day-night coupling by a localized flow channel visualized by polar cap patch propagation.
• Spicher, Andres; Cameron, T.; Grono, E.; Yakymenko, K.; Clausen, Lasse Boy Novock; Knudsen, D.; McWilliams, Kathryn & Moen, Jøran Idar (2014). Observation of Polar Cap Patches and Calculation of Gradient Drift Instability Growth Times: A Swarm Case Study.
• Clausen, Lasse Boy Novock; Moen, Jøran Idar; Saito, Yoshifumi; Chaston, C. C.; Trondsen, Espen; Bekkeng, Tore Andre; Bekkeng, Jan Kenneth & Pedersen, Arne (2013). Inertial Alfven waves observed by ICI-2.
• Lorentzen, Dag Arne; Baddeley, Lisa; Moen, Jøran Idar; Clausen, Lasse Boy Novock & Saito, T (2013). Multi-instrument observations during the ICI-3 sounding rocket campaign.

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