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Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.41 [2012] >
IJRSP Vol.41(2) [April 2012] >
| Title: | Corotating interaction region (CIR) induced magnetic storms during solar minimum and their effects on low-latitude geomagnetic field and ionosphere |
| Authors: | Veenadhari, B
Kumar, Sandeep
Ram, S Tulasi
Singh, Rajesh
Alex, S |
| Keywords: | Geomagnetic storm
Corotating interaction region (CIR)
Interplanetary electric field
Equatorial electrojet (EEJ) strength
Penetration electric field
F-region critical frequency |
| Issue Date: | Apr-2012 |
| Publisher: | NISCAIR-CSIR, India |
| PACS No.: | 94.30.Lr; 96.60.qd |
| Abstract: | The corotating interaction region (CIR) induced magnetic storms which
occurred during solar minimum are investigated to study their effects on
equatorial and low-latitude ionosphere and geomagnetic field at Indian sector. This
work was a part of Indian CAWSES campaign for the period of March – April 2006.
The penetration electric fields play a crucial role in modifying equatorial electric fields during severe magnetic storms and
these effects are not studied in detail for moderate magnetic storm originated
by CIRs. The present paper investigates the effects of CIR related moderate storms and found
that during the moderate magnetic storms, the short lived (duration of 2 - 3 h)
penetration of high latitude electric fields to equatorial ionosphere exists
during local morning and noon hours during main phase as inferred from changes in EEJ with the response to
interplanetary electric field. The variations of EEJ are linearly correlated with the
sudden changes in interplanetary electric field
(IEFY) around morning to noon hours, which confirms existence of the
penetration of electric fields. |
| Page(s): | 306-315 |
| 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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