Post-midnight equatorial scintillation activity in relation to geomagnetic disturbances

Details Post-midnight equatorial scintillation activity in relation to geomagnetic disturbances Post-midnight equatorial scintillation activity in relation to geomagnetic disturbances

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47..911d&link_type=abstract

(IUGG, IAGA, USAF, et al., International Symposium on Equatorial Aeronomy, 7th, Hong Kong, Mar. 22-29, 1984) Journal of Atmosphe

Physics

15

Equatorial Atmosphere, Geomagnetism, Magnetic Disturbances, Scintillation, Magnetic Signatures, Morning, Night Sky, Statistical Analysis, Very High Frequencies

Scientific paper

VHF amplitude scientilation measurements made during the period April 1978 through December 1982 at Calcutta (23 deg N, 88.5 deg E 32 deg N dip), situated near the northern crest of the Appleton Anomaly in the Indian sector, have been used to study the association of post-midnight (as well as post-sunrise) scintillations with the occurrences of the maximum negetive excursion in the variation of the earth's horizontal magnetic intensity. The post-midnight scintillation has been found to be related to the maximum negative excursion occurring in the 0000-0600 LT interval. No such relation is observed with the premidnight excursions. Scintillation with onset between 0000 and 0300 LT shows remarkable correspondence with the occurrence of negative excursion (18 out of 20 available cases). Magnetic conditions with Dst less than - 150 nT have been found to be most effective in producing the above scintillation activity. The results are interpreted in terms of the reversal of the equatorial horizontal electric field, under magnetically disturbed conditions, due to a coupling of the high latitude and magnetospheric current systems with the equatorial electric field.

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