Bibliography



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Found 3 entries in the Bibliography.


Showing entries from 1 through 3


2020

Traits of sub-kilometre F-region irregularities as seen with the Swarm satellites

During the night, in the F-region, equatorial ionospheric irregularities manifest as plasma depletions observed by satellites, and they may cause radio signals to fluctuate. In this study, the distribution characteristics of ionospheric F-region irregularities in the low latitudes were investigated using 16 Hz electron density observations made by a faceplate which is a component of the electric field instrument (EFI) onboard Swarm satellites of the European Space Agency (ESA). The study covers the period from October\ 2014 to October\ 2018 when the 16 Hz electron density data were available. For comparison, both the absolute (dNe) and relative (dNe/Ne) density perturbations were used to quantify the level of ionospheric irregularities. The two methods generally reproduced the local-time (LT), seasonal and longitudinal distribution of equatorial ionospheric irregularities as shown in earlier studies, demonstrating the ability of Swarm 16 Hz electron density data. A difference between the two methods was observed based on the latitudinal distribution of ionospheric irregularities where (dNe) showed a symmetrical distribution about the magnetic equator, while dNe/Ne showed a magnetic-equator-centred Gaussian distribution. High values of dNe and dNe/Ne were observed in spatial bins with steep gradients of electron density from a longitudinal and seasonal perspective. The response of ionospheric irregularities to geomagnetic and solar activities was also investigated using Kp index and solar radio flux index (F10.7), respectively. The reliance of dNe/Ne on solar and magnetic activity showed little distinction in the correlation between equatorial and off-equatorial latitudes, whereas dNe showed significant differences. With regard to seasonal and longitudinal distribution, high dNe and dNe/Ne values were often found during quiet magnetic periods compared to magnetically disturbed periods. The dNe increased approximately linearly from low to moderate solar activity. Using the high-resolution faceplate data, we were able to identify ionospheric irregularities on the scale of only a few hundred of metres.

Aol, Sharon; Buchert, Stephan; Jurua, Edward;

Published by: Annales Geophysicae      Published on: 02/2020

YEAR: 2020     DOI: 10.5194/angeo-38-243-2020

Ionospheric response at conjugate locations during the 7—8 September 2017 geomagnetic storm over the Europe-African longitude sector

This paper focuses on unique aspects of the ionospheric response at conjugate locations over Europe and South Africa during the 7–8 September 2017 geomagnetic storm including

Habarulema, John; Katamzi-Joseph, Zama; a, Dalia; Nndanganeni, Rendani; Matamba, Tshimangadzo; Tshisaphungo, Mpho; Buchert, Stephan; Kosch, Michael; Lotz, Stefan; Cilliers, Pierre; , others;

Published by: Journal of Geophysical Research: Space Physics      Published on:

YEAR: 2020     DOI: 10.1029/2020JA028307

2011

Ion Temperature Distribution in the High-Latitude Region (EISCAT UHF Radar Observations). What is the Field-aligned Currents Influence?

Teodosiev, Dimitar; Yordanova, Emiliya; Nenovski, Petko; Nikolova, Tatyana; Danov, Dimitar; Crowley, Geoff; Baddeley, Lissa; Buchert, Stefan;

Published by: Comptes rendus de l’Acad\ emie bulgare des Sciences      Published on:

YEAR: 2011     DOI:



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