Yaqi Jin

• Belakhovsky, V.B.; Jin, Yaqi & Miloch, Wojciech Jacek (2020). Influence of Different Ionospheric Disturbances on the GPS Scintillations at High Latitudes. Springer Proceedings in Earth and Environmental Sciences.  ISSN 2524-3438.  s 281- 287 . doi: 10.1007/978-3-030-21788-4_24
• Belakhovsky, V.B.; Jin, Yaqi & Miloch, Wojciech Jacek (2020). Influence of the substorm precipitation and polar cap patches on GPS signals at high latitudes. Sovremennye Problemy Distantsionnogo Zondirovaniya Zemli iz Kosmosa.  ISSN 2070-7401.  17(6), s 139- 144 . doi: 10.21046/2070-7401-2020-17-6-139-144
• Chernyshov, Alexander A.; Miloch, Wojciech Jacek; Jin, Yaqi & Zakharov, Viktor I. (2020). Relationship between TEC jumps and auroral substorm in the high-latitude ionosphere. Scientific Reports.  ISSN 2045-2322.  10 . doi: 10.1038/s41598-020-63422-9 Fulltekst i vitenarkiv.
• Jin, Yaqi & Xiong, Chao (2020). Interhemispheric asymmetry of large‐scale electron density gradients in the polar cap ionosphere: UT and seasonal variations. Journal of Geophysical Research (JGR): Space Physics.  ISSN 2169-9380.  125(2) . doi: 10.1029/2019JA027601 Fulltekst i vitenarkiv.
• Jin, Yaqi; Xiong, Chao; Clausen, Lasse Boy Novock; Spicher, Andres; Kotova, Daria; Brask, Steffen; Kervalishvili, Guram; Stolle, Claudia & Miloch, Wojciech Jacek (2020). Ionospheric Plasma Irregularities Based on In Situ Measurements From the Swarm Satellites. Journal of Geophysical Research (JGR): Space Physics.  ISSN 2169-9380.  125(7) . doi: 10.1029/2020JA028103 Fulltekst i vitenarkiv. Vis sammendrag

  In this study, we present global climatological distributions of ionospheric plasma irregularities based on measurements by the Swarm satellites. These first global statistics obtained by direct, in situ measurements of plasma variations with Swarm confirm the presence of three main regions of strong ionospheric irregularities: the magnetic equator extending from postsunset to early morning, in the auroral ovals (from dayside cusp to nightside), and inside the polar caps. At equatorial latitudes, ionospheric irregularities form two bands of enhanced plasma fluctuations centered around ±10° magnetic latitude. Due to different plasma processes, ionospheric irregularities at high and low latitudes show different distributions. Though the averaged intensity of plasma irregularities is weaker at equatorial latitudes than at high latitudes, the occurrence rate of significant plasma fluctuations (corresponding to extreme events) is much higher at the equator than that at high latitudes. Equatorial irregularities display clear seasonal and longitudinal variations; that is, they are most prominent over South America during the December solstice and are located over Africa during the June solstice. The magnitude of ionospheric irregularities at all latitudes is strongly controlled by the solar activity. Ionospheric irregularities become significantly weaker after 2016 during the current declining phase of solar activity. The interplanetary magnetic field Bz modulates the occurrence of ionospheric irregularities at both high and low latitudes.

• Ivarsen, Magnus Fagernes; Park, Jaeheung; Kwak, Young-Sil; Jin, Yaqi; Knudsen, D. J. & Clausen, Lasse Boy Novock (2020). Observational Evidence for the Role of Hall Conductance in Alfvén Wave Reflection. Journal of Geophysical Research (JGR): Space Physics.  ISSN 2169-9380.  125(12) . doi: 10.1029/2020JA028119 Fulltekst i vitenarkiv.
• Spicher, Andres; Deshpande, Kshitija; Jin, Yaqi; Oksavik, Kjellmar; Zettergren, Matthew D.; Clausen, Lasse Boy Novock; Moen, Jøran Idar; Hairston, Marc R. & Baddeley, Lisa (2020). On the Production of Ionospheric Irregularities Via Kelvin-Helmholtz Instability Associated with Cusp Flow Channels. Journal of Geophysical Research (JGR): Space Physics.  ISSN 2169-9380.  125(6) . doi: 10.1029/2019JA027734 Fulltekst i vitenarkiv. Vis sammendrag

  We present a multi‐instrument multiscale study of a channel of enhanced, inhomogeneous flow in the cusp ionosphere occurring on November 30, 2014. We provide evidence that strong Global Navigation Satellite System (GNSS) phase scintillations indices (σϕ>0.5 rad) can arise from such events, indicating that they are important in the context of space weather impacts on technology. We compare in detail two‐dimensional maps of ionospheric density, velocity, and temperatures obtained by the European Incoherent Scatter Scientific Association Svalbard Radar with scintillation indices detected from a network of four GNSS receivers around Svalbard and examine the different sources of free energy for irregularity creation. We observe that the strongest phase scintillations occur on the poleward side of the flow channel in a region of sheared plasma motion and structured low‐energy particle precipitation. As inhomogeneous plasma flows are evident in our observations, we perform a quantitative, nonlinear analysis of the Kelvin–Helmholtz instability (KHI) and its impact on phase scintillations using numerical simulations from the first principles‐based Geospace Environment Model of Ion‐Neutral Interactions and Satellite‐beacon Ionospheric‐scintillation Global Model of the upper Atmosphere. Using representative values consistent with the radar data, we show that KHI can efficiently create density structures along with considerable scintillations and is thus likely to contribute significantly under similar conditions, which are frequent in the cusp.

• Zakharov, V.I.; Chernyshov, A.A.; Miloch, Wojciech Jacek & Jin, Yaqi (2020). Influence of the Ionosphere on the Parameters of the GPS Navigation Signals during a Geomagnetic Substorm. Geomagnetism and Aeronomy.  ISSN 0016-7932.  60(6), s 754- 767 . doi: 10.1134/S0016793220060158
• Follestad, Anna Kristine Fæhn; Clausen, Lasse Boy Novock; Thomas, E.G.; Jin, Yaqi & Coster, A. (2019). Polar cap patch prediction in the expanding contracting polar cap paradigm. Space Weather.  ISSN 1542-7390.  17(11), s 1570- 1583 . doi: 10.1029/2019SW002276 Fulltekst i vitenarkiv.
• Han, De-Sheng; Xu, Tong; Jin, Yaqi; Oksavik, Kjellmar; Chen, Xiangcai; Liu, Jian-Jun; Zhang, Qinghe; Baddeley, Lisa & Herlingshaw, Katie (2019). Observational evidence for throat aurora being associated with magnetopause reconnection. Geophysical Research Letters.  ISSN 0094-8276.  46(13), s 7113- 7120 . doi: 10.1029/2019GL083593 Fulltekst i vitenarkiv.
• Ivarsen, Magnus Fagernes; Hoang, Huy Minh; Yang, Lei; Clausen, Lasse Boy Novock; Spicher, Andres; Jin, Yaqi; Trondsen, Espen; Moen, Jøran Idar; Røed, Ketil & Lybekk, Bjørn (2019). Multineedle Langmuir Probe Operation and Acute Probe Current Susceptibility to Spacecraft Potential. IEEE Transactions on Plasma Science.  ISSN 0093-3813.  47(8), s 3816- 3823 . doi: 10.1109/TPS.2019.2906377 Fulltekst i vitenarkiv.
• Ivarsen, Magnus Fagernes; Jin, Yaqi; Spicher, Andres & Clausen, Lasse Boy Novock (2019). Direct Evidence for the Dissipation of Small-Scale Ionospheric Plasma Structures by a Conductive E Region. Journal of Geophysical Research (JGR): Space Physics.  ISSN 2169-9380.  124(4), s 2935- 2942 . doi: 10.1029/2019JA026500 Fulltekst i vitenarkiv.
• Jin, Yaqi; Moen, Jøran Idar; Spicher, Andres; Oksavik, Kjellmar; Miloch, Wojciech Jacek; Clausen, Lasse Boy Novock; Pożoga, Mariusz & Saito, Yoshifumi (2019). Simultaneous rocket and scintillation observations of plasma irregularities associated with a reversed flow event in the cusp ionosphere. Journal of Geophysical Research (JGR): Space Physics.  ISSN 2169-9380.  124(8), s 7098- 7111 . doi: 10.1029/2019JA026942 Fulltekst i vitenarkiv.
• Jin, Yaqi; Spicher, Andres; Xiong, Chao; Clausen, Lasse Boy Novock; Kervalishvili, Guram; Stolle, Claudia & Miloch, Wojciech Jacek (2019). Ionospheric Plasma Irregularities Characterized by the Swarm Satellites: Statistics at High Latitudes. Journal of Geophysical Research (JGR): Space Physics.  ISSN 2169-9380.  124(2), s 1262- 1282 . doi: 10.1029/2018JA026063 Fulltekst i vitenarkiv.
• Xiong, Chao; Yin, Fan; Luo, Xiaomin; Jin, Yaqi & Wan, Xin (2019). Plasma patches inside the polar cap and auroral oval: The impact on the spaceborne GPS receiver. Journal of Space Weather and Space Climate.  ISSN 2115-7251.  9 . doi: 10.1051/swsc/2019028 Fulltekst i vitenarkiv.
• 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 Fulltekst i vitenarkiv.
• Jin, Yaqi; Miloch, Wojciech Jacek; Moen, Jøran Idar & Clausen, Lasse Boy Novock (2018). Solar cycle and seasonal variations of the GPS phase scintillation at high latitudes. Journal of Space Weather and Space Climate.  ISSN 2115-7251.  8 . doi: 10.1051/swsc/2018034 Fulltekst i vitenarkiv.
• Jin, Yaqi & Oksavik, Kjellmar (2018). GPS Scintillations and Losses of Signal Lock at High Latitudes During the 2015 St. Patrick's Day Storm. Journal of Geophysical Research (JGR): Space Physics.  ISSN 2169-9380.  123(9), s 7943- 7957 . doi: 10.1029/2018JA025933 Fulltekst i vitenarkiv.
• Miloch, Wojciech Jacek; Jin, Yaqi; Xiong, Chao; Kervalishvili, Guram; Spicher, Andres; Clausen, Lasse Boy Novock & Stolle, Claudia (2018). Ionospheric plasma irregularities studied with Swarm satellites. E3S Web of Conferences.  ISSN 2267-1242.  62, s 1- 6 . doi: 10.1051/e3sconf/20186201009 Fulltekst i vitenarkiv.
• 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 Fulltekst i vitenarkiv. Vis sammendrag

  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.

• 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 (JGR): Space Physics.  ISSN 2169-9380. . doi: 10.1002/2016JA023750 Fulltekst i vitenarkiv.
• 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 (JGR): Space Physics.  ISSN 2169-9380.  121(5), s 4679- 4697 . doi: 10.1002/2016JA022613
• Jin, Yaqi; Zhou, Xiaoyan; Moen, Jøran Idar & Hairston, Marc (2016). The auroral ionosphere TEC response to an interplanetary shock. Geophysical Research Letters.  ISSN 0094-8276.  43(5), s 1810- 1818 . doi: 10.1002/2016GL067766
• 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 (JGR): Space Physics.  ISSN 2169-9380.  120(2), s 1478- 1487 . doi: 10.1002/2014JA020586
• Jin, Yaqi; Moen, Jøran Idar & Miloch, Wojciech Jacek (2015). On the collocation of the cusp aurora and the GPS phase scintillation: a statistical study. Journal of Geophysical Research (JGR): Space Physics.  ISSN 2169-9380.  120(10), s 9176- 9191 . doi: 10.1002/2015JA021449
• Jin, Yaqi; Moen, Jøran Idar & Miloch, Wojciech Jacek (2014). GPS scintillation effects associated with polar cap patches and substorm auroral activity: direct comparison. Journal of Space Weather and Space Climate.  ISSN 2115-7251.  4 . doi: 10.1051/swsc/2014019

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• Kotova, Daria; Jin, Yaqi; Brask, Steffen; Cilliers, Pierre & Miloch, Wojciech Jacek (2020). Comparison of characteristics of electron density fluctuations from Swarm satellites with the ground-based scintillation dat.
• Kotova, Daria; Jin, Yaqi & Miloch, Wojciech Jacek (2020). Variability of ionospheric parameters by the Swarm satellites for different solar activity.
• Spicher, Andres; Kletzing, Craig A.; Bounds, Scott; Bonnell, John W.; Roglans, Roger; Fuselier, Stephen A.; Sawyer, Rhyan; Rowland, Douglas E.; Pfaff, Robert F.; Clemmons, James H.; Collier, Michael R.; Akbari, Hassanali; LaBelle, James William; Hatch, Spencer Mark; Oksavik, Kjellmar; Takahashi, Toru; Moen, Jøran Idar; Miloch, Wojciech Jacek; Zettergren, Matthew D.; Deshpande, Kshitija & Jin, Yaqi (2020). Cusp rocket experiment of density structures.
• Spicher, Andres; LaBelle, James William; Bonnell, John W; Bounds, Scott; Clausen, Lasse Boy Novock; Di Mare, Francesca; Fuselier, Stephen A.; Jin, Yaqi; Kletzing, Craig A.; Oksavik, Kjellmar; Miloch, Wojciech Jacek; Moen, Jøran Idar; Moser, Chrystal; Roglans, Roger; Sawyer, Rhyan & Takahashi, Toru (2020). On multi-scale density irregularities observed by sounding rockets within regions of enhanced scintillations in the cusp ionosphere.
• Han, Desheng; Xu, Tong; Jin, Yaqi; Oksavik, Kjellmar; Chen, Xiangcai; Liu, J.-J.; Zhang, Qing-He; Baddeley, Lisa & Herlingshaw, Katie (2019). Meso-scale ionospheric flow cells, localized Joule heating, and ion upflow associated with throat aurora as observed by EISCAT.
• Jin, Yaqi & Oksavik, Kjellmar (2019). Severe GPS Phase and Amplitude Scintillations at High Latitudes During the 2015 St. Patrick’s Day Storm.
• Kotova, Daria; Jin, Yaqi & Miloch, Wojciech Jacek (2019). Comparison of ionospheric plasma irregularities measured by Swarm with the ground-based GPS scintillation data. Vis sammendrag

  Ionospheric irregularities are often the cause of GNSS precise positioning errors, as well as disruption of radio communications in the HF range. The reason for the occurrence of these irregularities can be various non-stationary processes in the near-Earth space plasma that depend on the response of the ionosphere to the variations in the near Earth space. Therefore, the study of ionospheric irregularities is an urgent scientific and applied problem. In this study we use a global product based on the Swarm satellite measurements that characterizes ionospheric irregularities and fluctuations. The IPIR (Ionospheric Plasma IRregularities product) provides characteristics of plasma density structures in the ionosphere, of plasma irregularities in terms of their amplitudes, gradients and spatial scales and assigns them to geomagnetic regions and consequently to predominant plasma processes. It also provides indication, in the form of a numerical value index, on their severity for the integrity of trans-ionospheric radio signals and hence the accuracy of GNSS precise positioning. In this work we made validations of the IPIR product against the ground-based measurements, focusing on GPS TEC and scintillation data in low latitudes regions.

• Miloch, Wojciech Jacek; Kotova, Daria; Jin, Yaqi; Xiong, Chao; Brask, Steffen; Kervalishvili, Guram; Spicher, Andres; Clausen, Lasse Boy Novock & Stolle, Claudia (2019). Ionospheric plasma irregularities studied globally with the Swarm satellites.
• Spicher, Andres; Deshpande, Kshitija; Zettergren, Matthew D.; Oksavik, Kjellmar; Jin, Yaqi; Clausen, Lasse Boy Novock & Moen, Jøran Idar (2019). Modeling scintillation produced by ionospheric Kelvin Helmholtz in the cusp ionosphere using GEMINI-SIGMA. Vis sammendrag

  Ionospheric irregularities are known to cause fluctuations in radio signals called scintillation in the phase and amplitude of the complex signal. The turbulent structures responsible for the scintillation are a few hundreds of meters to few tens of kilometers scale sizes (intermediate scale sizes). With the growing interest in high latitude scintillation, we would like to investigate the effect of typical physical mechanisms on the radio scintillation. Here we present our modeling studies of Global Positioning System (GPS) scintillation through Kelvin Helmholtz instability (KHI) in the cusp region. For modeling we use the first principles based Geospace Environment Model of Ion-Neutral Interactions (GEMINI) and Satellite-beacon Ionospheric-scintillation Global Model of the upper Atmosphere (SIGMA). We utilize a cusp event study with detailed observations from the EISCAT Svalbard Radar (ESR) and scintillations detected from a network of four Global Navigation Satellite Systems (GNSS) receivers in Svalbard. The event presents evidences of the role of magnetosphere-ionosphere coupling in the generation of plasma irregularities and scintillations in the cusp. Using numerical simulations, we investigate the potential role of the Kelvin-Helmholtz instability in producing such scintillation. Furthermore, we compare the results with characteristics of GPS scintillations associated with a polar cap patch and the gradient drift instability to deduce distinctive characteristics of the respective plasma irregularities.

• Spicher, Andres; Oksavik, Kjellmar; Jin, Yaqi; Clausen, Lasse Boy Novock; Zettergren, Matthew D.; Deshpande, K. B.; Moen, Jøran Idar & Baddeley, Lisa (2019). A reverse flow event as the onset of ionospheric scintillation irregularities in the cusp.
• Spicher, Andres; Oksavik, Kjellmar; Jin, Yaqi; Moen, Jøran Idar; Baddeley, Lisa & Clausen, Lasse Boy Novock (2019). On the sources of Cusp Ionospheric Scintillation Irregularities.
• Jin, Yaqi; Miloch, Wojciech Jacek; Clausen, Lasse Boy Novock; Spicher, Andres; Stolle, Claudia; Kervalishvili, G. & Xiong, Chao (2018). Ionospheric Plasma Irregularities Characterized by the Swarm satellites.
• Jin, Yaqi; Spicher, Andres; Xiong, Chao; Clausen, Lasse Boy Novock; Stolle, Claudia; Kervalishvili, G. & Miloch, Wojciech Jacek (2018). Detecting high-latitude ionospheric plasma irregularities by Swarm satellites.
• Spicher, Andres; Clausen, Lasse Boy Novock; Miloch, Wojciech Jacek; Jin, Yaqi; Lofstad, Victoria Emilie & Moen, Jøran Idar (2018). Polar cap patch climatology based on Swarm density data.
• Jin, Yaqi (2017). In-situ Measurement of Reversed Flow Event in the Cusp Ionosphere.
• Jin, Yaqi & Moen, Jøran Idar (2017). The cusp ionosphere as driven by dayside transient.
• Jin, Yaqi (2016). Characterization of GPS Scintillations in the Polar Ionosphere. Fulltekst i vitenarkiv.
• Jin, Yaqi; Moen, Jøran Idar & Miloch, Wojciech Jacek (2015). On the collocation of the cusp aurora and the GPS phase scintillation: A statistical study.

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