Polar cap plasma patch primary linear instability growth rates compared [PDF]
Journal of Geophysical Research: Space Physics, 2016 AbstractFour primary plasma instability processes have been proposed in the literature to explain the generation of phase scintillation associated with polar cap plasma patches. These are the gradient drift, current convective, and Kelvin‐Helmholtz instabilities and a small‐scale “turbulence” process.
Burston, Robert +2 more
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Interhemispheric comparison of GPS phase scintillation at high latitudes during the magnetic-cloud-induced geomagnetic storm of 5–7 April 2010 [PDF]
Annales Geophysicae, 2011 Arrays of GPS Ionospheric Scintillation and TEC Monitors (GISTMs) are used in a comparative scintillation study focusing on quasi-conjugate pairs of GPS receivers in the Arctic and Antarctic.
P. Prikryl +18 more
doaj +1 more source
Automated identification and tracking of polar-cap plasma patches at solar minimum [PDF]
Annales Geophysicae, 2014 A method of automatically identifying and tracking polar-cap plasma patches, utilising data inversion and feature-tracking methods, is presented.
R. Burston +3 more
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Ionospheric patch formation: Direct measurements of the origin of a polar cap patch [PDF]
Geophysical Research Letters, 2004 We present the first direct measurements documenting the origin of an ionospheric patch, emerging into the polar cap from the noon dark cusp region of the dayside auroral oval. A series of such patches were observed. The observed patch‐formation signatures, in plasma density and velocity, ion and electron temperature, and optical transient signatures ...
Herbert C. Carlson +3 more
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Modulation of nightside polar patches by substorm activity [PDF]
Annales Geophysicae, 2009 Results are presented from a multi-instrument study showing the influence of geomagnetic substorm activity on the spatial distribution of the high-latitude ionospheric plasma.
A. G. Wood, S. E. Pryse, J. Moen
doaj +1 more source
Statistical Characteristics of Polar Cap Patches Observed by RISR‐C [PDF]
Journal of Geophysical Research: Space Physics, 2018 AbstractPolar cap “patches” are ~100 to 1,000 km islands of high‐density plasma at polar latitudes, which can cause scintillation to communication and navigation signals. An automatic algorithm for patch identification has been developed and applied to the observations from the Resolute Bay Incoherent Scatter Radar‐Canada during January to March and ...
Jiaen Ren +4 more
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Observations of polar patches generated by solar wind Alfvén wave coupling to the dayside magnetosphere [PDF]
Annales Geophysicae, 1999 A long series of polar patches was observed by ionosondes and an all-sky imager during a disturbed period (Kp = 7- and IMF Bz < 0). The ionosondes measured electron densities of up to 9 × 1011 m-3 in the patch center, an increase above the density
P. Prikryl +6 more
doaj +1 more source
Polar tongue of ionisation during geomagnetic superstorm [PDF]
Annales Geophysicae, 2021 During the main phase of geomagnetic storms, large positive ionospheric plasma density anomalies arise at middle and polar latitudes. A prominent example is the tongue of ionisation (TOI), which extends poleward from the dayside storm-enhanced density ...
D. Pokhotelov +2 more
doaj +1 more source
Two‐dimensional direct imaging of structuring of polar cap patches [PDF]
Journal of Geophysical Research: Space Physics, 2013 A highly sensitive all‐sky electron multiplier charge‐coupled device airglow imager has been operative in Longyearbyen, Norway (78.1°N, 15.5°E), since October 2011. The imager obtains the 630.0 nm all‐sky images with an exposure time of 4 s, which is about 10 times shorter than the conventional cooled CCD airglow imagers.
K. Hosokawa +3 more
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Development of low-cost multi-wavelength imager system for studies of aurora and airglow [PDF]
, 2020 This paper introduces a new system that can monitor aurora and atmospheric airglow using a low-cost Watec monochromatic imager (WMI) equipped with a sensitive camera, a filter with high transmittance, and the non-telecentric optics.
Brändström, U. +22 more
core +2 more sources