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Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.41 [2012] >
IJRSP Vol.41(2) [April 2012] >
| 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.dj; 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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