|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.41 [2012] >
IJRSP Vol.41(2) [April 2012] >
| Title: | VHF radar observations of post-midnight F-region field-aligned irregularities over Indonesia during solar minimum |
| Authors: | Otsuka, Y
Shiokawa, K
Nishioka, M
Effendy |
| Keywords: | F-region irregularities
Field-aligned irregularities (FAIs)
Plasma bubbles
Traveling ionospheric disturbances |
| Issue Date: | Apr-2012 |
| Publisher: | NISCAIR-CSIR, India |
| PACS No.: | 94.20.dj; 94.20.Vv; 96.60.qd |
| Abstract: | A VHF backscatter
radar with operating frequency 30.8 MHz has been operated at Kototabang
(0.20°S, 100.32°E; dip latitude 10.4°S), Indonesia since February 2006. The F-region
field-aligned irregularities (FAIs) observed by this radar from February 2006
to December 2010 during a solar minimum period have been analyzed and found
that FAIs appeared frequently at the post-midnight sector between May and
August every year from 2006 to 2010. Five-beam measurements by the radar
revealed zonal propagation of the F-region FAIs. The present paper reports, for
the first time, statistics of the zonal propagation velocity of the
post-midnight FAIs. Between May and August, 46% (14%) of the post-midnight FAIs
propagated westward (eastward), and zonal propagation was not discernible for
40% of the post-midnight FAIs. Average velocity was approximately 50 m s-1 westward.
The post-midnight FAIs were likely associated with either plasma bubbles or
medium-scale traveling ionospheric disturbances (MSTIDs). |
| Page(s): | 199-207 |
| 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]
|
|
