Low latitude E-region irregularities studied using Gadanki radar,ionosonde and in situ measured electron density |
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| Authors: | D V Phani Kumar A K Patra Y-S Kwak K-H Kim G Yellaiah |
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| Institution: | (1) British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB3 0ET, UK;(2) Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK;(3) UAF Geophysical Institute, 903 Koyukuk Drive, Fairbanks, AK 99775, USA;(4) University of Saskatchewan, 116 Science Place, Saskatoon, SK, Canada, S7N 5E2;(5) Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, 20723, USA;(6) Department of Physics, La Trobe University, Victoria, 3086, Australia;(7) Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan;(8) School of Physics, University of KwaZulu-Natal, Durban, 4041, South Africa;(9) National Institute of Polar Research, Tokyo, Japan;(10) LPCE/CNRS, 3A, Avenue de la recherche Scientifique, Orleans, 45071, France |
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| Abstract: | In this paper, we attempt to identify the driving forces responsible for the generation of low-latitude E-region field-aligned
irregularities (FAIs). It is evident that the low-latitude E-region FAIs occur both during the day and night with preferential
occurrence being most during local sunrise period. Simultaneous measurements are made with Gadanki radar and nearby located
Ionosonde for understanding the low-latitude Es–FAIs relationship. The observations suggest that the occurrence and SNR of
FAIs have a close relationship with f
t
E
s
−−f
b
E
s
. Finally, using the past electron density profiles and reasonable values of electric field, we have shown that it is generally
difficult with the gradient drift instability to explain low-latitude E-region FAIs when electric field alone is considered
as driving agency. We hypothesize that neutral winds play important role for the generation of irregularities at low latitudes
outside the electrojet belt either by forming sharp Es layers or by enhancing the differential drift of electrons and ions
or by both. |
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