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Spread-F during the magnetic storm of 22 January 2004 at low latitudes: Effect of IMF-Bz in relation to local sunset time |
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| Authors: | R G Rastogi H Chandra P Janardhan Thai Lan Hoang Louis Condori T K Pant D S V V D Prasad B Reinisch |
| Affiliation: | 1. Physical Research Laboratory, Ahmedabad, 380 009, India 2. Institute of Physics, Vietnam Academy of Sciences, Ho Chi Minh City, Vietnam 3. Jicamarca Radio Observatory, Jicamarca, Peru 4. Space Physics Laboratory, Thiruvananthapuram, India 5. Department of Physics, Andhra University, Vishakhapatnam, 530 000, India 6. Digisonde International LLC 175, Lowell, (Mass), 01854, USA |
| Abstract: | The paper describes the results of spread-F at low latitude stations around the world during the magnetic storm starting at 0130 UT on 22 January 2004. The storm can be divided into two phases, first phase up to 1000 UT when interplanetary magnetic field IMF-Bz was highly fluctuating around a small positive value and the second phase after a sudden large southward turning of IMF-Bz at 1030 UT. The first phase produced strong spread-F at Jicamarca, Sao Luis, and Ascension Island and caused complete inhibition of spread-F at Thumba and Waltair in India. It generated weak spread-F at Ho Chi Minh City in Vietnam and strong spread-F at Hainan and Chung Li. The strong spread-F at Hainan and Chung Li were caused by the positive IMF-Bz during the first phase of the storm and not by the negative pulse of IMF-Bz at 1000 UT. |
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