Plasma density gradients at the edge of polar ionospheric holes: the absence of phase scintillation
| Autor: | Anthea J. Coster, Alexandra Ruth Fogg, Kjellmar Oksavik, Alan Wood, Tim K. Yeoman, Luke Jenner, Gareth Dorrian |
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| Rok vydání: | 2020 |
| Předmět: |
Atmospheric Science
Electron density Materials science 010504 meteorology & atmospheric sciences Incoherent scatter 01 natural sciences Physics::Geophysics Phase (matter) 0103 physical sciences Earth and Planetary Sciences (miscellaneous) Solstice lcsh:Science 010303 astronomy & astrophysics Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences Scintillation lcsh:QC801-809 Northern Hemisphere Geology Astronomy and Astrophysics lcsh:QC1-999 Computational physics lcsh:Geophysics. Cosmic physics 13. Climate action Space and Planetary Science Physics::Space Physics Polar lcsh:Q Ionosphere lcsh:Physics |
| Zdroj: | Annales Geophysicae, Vol 38, Pp 575-590 (2020) Annales Geophysicae |
| ISSN: | 1432-0576 |
| Popis: | Polar holes were observed in the high-latitude ionosphere during a series of multi-instrument case studies close to the Northern Hemisphere winter solstice in 2014 and 2015. These holes were observed during geomagnetically quiet conditions and under a range of solar activities using the European Incoherent Scatter (EISCAT) Svalbard Radar (ESR) and measurements from Global Navigation Satellite System (GNSS) receivers. Steep electron density gradients have been associated with phase scintillation in previous studies; however, no enhanced scintillation was detected within the electron density gradients at these boundaries. It is suggested that the lack of phase scintillation may be due to low plasma density levels and a lack of intense particle precipitation. It is concluded that both significant electron density gradients and plasma density levels above a certain threshold are required for scintillation to occur. |
| Databáze: | OpenAIRE |
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