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Title: Multi-instrument observations of winter solstice F-region irregularities during the low solar activity
Authors: Dashora, N
Taori, A
Patra, A K
Keywords: F-region irregularities
Equatorial plasma bubbles
Plasma irregularities
Low solar activity condition
TEC depletion
Airglow depletion
Issue Date: Apr-2012
Publisher: NISCAIR-CSIR, India
PACS No.:; 94.20.Vv; 96.60.Q-
Abstract: Coordinated observations of the nighttime ionosphere in the Indian low-latitude zone were conducted during the winter of 2008-2009 using GPS TEC/Scintillation receiver, radar, ionosonde, and airglow photometer. It has been noted that out of ten nights of observations from 19 January to 27 January 2009, F-region irregularities were observed on six nights. Three distinctly different case studies have been presented to characterize the plasma irregularities observed during the extremely low solar activity condition. Specifically, the focus is on: (i) space-time evolution of plasma bubbles, (ii) zonal drift of the depleted regions, (iii) absence of sub-kilometer scale irregularities in the presence of its higher and lower scale irregularities, and (iv) characteristics of the post-midnight F-region irregularities. It has been found that rate of change of TEC index (ROTI) and derivative of ROTI (DROTI) increase with TEC depletions, but no correlation was found between DROTI and S4 index. These observations are discussed in the light of current understanding on the plasma irregularity processes with due importance to TEC variation and scintillation, which are detrimental for GPS based communication navigation applications.
Page(s): 220-232
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.41(2) [April 2012]

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