scholarly journals Effects of solar wind high-speed streams on the high-latitude ionosphere: Superposed epoch study

2015 ◽  
Vol 120 (12) ◽  
pp. 10,669-10,687 ◽  
Author(s):  
M. Grandin ◽  
A. T. Aikio ◽  
A. Kozlovsky ◽  
T. Ulich ◽  
T. Raita
Keyword(s):  
Solar Wind ◽  
High Latitude ◽  
High Speed ◽  
High Latitude Ionosphere

scholarly journals Cosmic radio noise absorption in the high-latitude ionosphere during solar wind high-speed streams

2017 ◽  
Vol 122 (5) ◽  
pp. 5203-5223 ◽  
Author(s):  
M. Grandin ◽  
A. T. Aikio ◽  
A. Kozlovsky ◽  
T. Ulich ◽  
T. Raita
Keyword(s):  
Solar Wind ◽  
High Latitude ◽  
High Speed ◽  
Cosmic Radio ◽  
Radio Noise ◽  
Noise Absorption ◽  
High Latitude Ionosphere

scholarly journals The dependence of high-latitude PcS wave power on solar wind velocity and on the phase of high-speed solar wind streams

1998 ◽  
Vol 103 (A11) ◽  
pp. 26271-26283 ◽  
Author(s):  
Mark Engebretson ◽  
Karl-Heinz Glassmeier ◽  
Martin Stellmacher ◽  
W. Jeffrey Hughes ◽  
Hermann Lühr
Keyword(s):  
Solar Wind ◽  
Wind Velocity ◽  
High Latitude ◽  
High Speed ◽  
Solar Wind Velocity ◽  
Wave Power ◽  
Speed Solar Wind ◽  
High Speed Solar Wind

Recurrent high-speed solar wind co-rotating interaction region imprint on the ionosphere and atmosphere: GPS TEC variations and atmospheric gravity waves

2020 ◽  
Author(s):  
James M. Weygand ◽  
Paul Prikryl ◽  
Reza Ghoddousi-Fard ◽  
Lidia Nikitina ◽  
Bharat S. R. Kunduri
Keyword(s):  
Solar Wind ◽  
Gravity Waves ◽  
High Latitude ◽  
High Speed ◽  
Geomagnetic Storms ◽  
Coronal Holes ◽  
Lower Thermosphere ◽  
Ionospheric Currents ◽  
Atmospheric Gravity Waves ◽  
Atmospheric Gravity

<p>High-speed streams (HSS) from coronal holes dominate solar wind structure in the absence of coronal mass ejections during solar minimum and the descending branch of solar cycle. Prominent and long-lasting coronal holes produce intense co-rotating interaction regions (CIR) on the leading edge of high-speed plasma streams that cause recurrent ionospheric disturbances and geomagnetic storms. Through solar wind coupling to the magnetosphere-ionosphere-atmosphere (MIA) system they affect the ionosphere and neutral atmosphere at high latitudes, and, at mid to low latitudes, by the transmission of the electric fields [1] and propagation of atmospheric gravity waves from the high-latitude lower thermosphere [2].</p><p>The high-latitude ionospheric structure, caused by precipitation of energetic particles, strong ionospheric currents and convection, results in changes of the GPS total electron content (TEC) and rapid variations of GPS signal amplitude and phase, called scintillation [3]. The GPS phase scintillation is observed in the ionospheric cusp, polar cap and auroral zone, and is particularly intense during geomagnetic storms, substorms and auroral breakups. Phase scintillation index is computed for a sampling rate of 50 Hz by specialized GPS scintillation receivers from the Canadian High Arctic Ionospheric Network (CHAIN). A proxy index of phase variation is obtained from dual frequency measurements of geodetic-quality GPS receivers sampling at 1 Hz, which include globally distributed receivers of the RT-IGS network that are monitored by the Canadian Geodetic Survey in near-real-time [4]. Temporal and spatial changes of TEC and phase variations following the arrivals of HSS/CIRs [5] are investigated in the context of ionospheric convection and equivalent ionospheric currents derived from  a ground magnetometer network using the spherical elementary current system method [6,7].</p><p>The Joule heating and Lorentz forcing in the high-latitude lower thermosphere have long been recognized as sources of internal atmospheric gravity waves (AGWs) [2] that propagate both upward and downward, thus providing vertical coupling between atmospheric layers. In the ionosphere, they are observed as traveling ionospheric disturbances (TIDs) using various techniques, e.g., de-trended GPS TEC maps [8].</p><p>In this paper we examine the influence on the Earth’s ionosphere and atmosphere of a long-lasting HSS/CIRs from recurrent coronal holes at the end of solar cycles 23 and 24. The solar wind MIA coupling, as represented by the coupling function [9], was strongly increased during the arrivals of these HSS/CIRs.</p><p> </p><p>[1] Kikuchi, T. and K. K. Hashimoto, Geosci. Lett. , 3:4, 2016.</p><p>[2] Hocke, K. and K. Schlegel, Ann. Geophys., 14, 917–940, 1996.</p><p>[3] Prikryl, P., et al., J. Geophys. Res. Space Physics, 121, 10448–10465, 2016.</p><p>[4] Ghoddousi-Fard et al., Advances in Space Research, 52(8), 1397-1405, 2013.</p><p>[5] Prikryl et al. Earth, Planets and Space, 66:62, 2014.</p><p>[6] Amm O., and A. Viljanen, Earth Planets Space, 51, 431–440, 1999.</p><p>[7] Weygand J.M., et al., J. Geophys. Res., 116, A03305, 2011.</p><p>[8] Tsugawa T., et al., Geophys. Res. Lett., 34, L22101, 2007.</p><p>[9] Newell P. T., et al., J. Geophys. Res., 112, A01206, 2007.</p>

scholarly journals Effects of Abrupt Variations of Solar Wind Dynamic Pressure on the High-Latitude Ionosphere

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Igino Coco ◽  
Ermanno Amata ◽  
Maria Federica Marcucci ◽  
Danila Ambrosino ◽  
Simon G. Shepherd
Keyword(s):  
Solar Wind ◽  
High Latitude ◽  
Statistical Study ◽  
Dynamic Pressure ◽  
Solar Wind Dynamic Pressure ◽  
Polar Cap ◽  
Radar Backscatter ◽  
Preliminary Results ◽  
Radar Network ◽  
High Latitude Ionosphere

We show the results of a statistical study on the effects in the high-latitude ionosphere of abrupt variations of solar wind dynamic pressure, using Super Dual Auroral Radar Network (SuperDARN) data in both hemispheres. We find that, during periods of quiet ionospheric conditions, the amount of radar backscatter increases when a variation in the dynamic pressure occurs, both positive (increase of the pressure) and negative (decrease of the pressure). We also investigate the behaviour of the Cross-Polar Cap Potential (CPCP) during pressure variations and show preliminary results.

Characteristics of a HSS-driven magnetic storm in the high-latitude ionosphere; A case study of 14th of March 2016 storm

2020 ◽  
Author(s):  
Nada Ellahouny ◽  
Anita Aikio ◽  
Marcus Pedersen ◽  
Heikki Vanhamäki ◽  
Ilkka Virtanen ◽  
...  
Keyword(s):  
Solar Wind ◽  
Magnetic Storm ◽  
High Speed ◽  
Radar Data ◽  
Geomagnetic Disturbances ◽  
Plasma Parameters ◽  
D Region ◽  
High Latitude Ionosphere ◽  
Eiscat Radar ◽  
Cosmic Noise

<p> Solar wind High-Speed Streams (HSSs) affect the auroral ionosphere in many ways, and several separate studies have been conducted of the different effects seen e.g. on aurora, geomagnetic disturbances, F-region behavior, and energetic particle precipitation. In this work, we study an HSS event in the solar cycle (24), which was associated with a co-rotating interaction region (CIR) that hit the Earth’s magnetopause at about 17:20 UT on 14 March 2016. The associated magnetic storm lasted for seven days, and the Dst index reached -56 nT. We use a very comprehensive set of measurements to study the whole period of this storm, following day by day for the magnetic indices and solar wind parameters and relating its consequences on ionospheric plasma parameters. We use EISCAT radar data from Tromsø and Svalbard stations to see the response in plasma parameters at different altitudes, riometer data for cosmic noise absorption, and IMAGE magnetometers to see the intensities of auroral electrojets. TomoScand ionospheric tomography provides us with electron densities over a wide region in Scandinavia and AMPERE data the global field-aligned currents. We identified 13 local substorms in the Scandinavian sector from the IL (IMAGE lower) index. Altogether, there were 11 global substorms, for which the AE index reaches 1000 nT. We discuss the development of currents, as well as E and D region precipitation during the course of this long-duration storm and compare local versus global behavior.</p>

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