Some anomalous features of the ionospheric F2-layer at low latitude conjugate places
The diurnal variation of the F2-layer critical frequency (f0F2) is compared with the diurnal variations of the horizontal component H of the Earth's magnetic field and of the declination D at a pair of low latitude conjugate stations in the Pacific and the Atlantic zones for a medium-low solar activity period. It is shown that the daytime bite-out in f0F2 and its seasonal anomaly are dependent on the characteristic daily variation of the H-field. There is also an indication of the effect of E -W declination on the diurnal variation of f0F2 at places near magnetic dip 45 to 50 deg as explained by H. Kohl, J. W. King and D. Eccles STAJ. Atmos. Terr. Phys., 31(1969), 1011!; such effect is not observed at low latitudes. The day-time depression in f0F2 seems to be more pronounced at Port Stanley in summer than at its northern conjugate Puerto Rico, perhaps because of the additional effect of the neutral wind-associated vertical drift of ionization, for which the situation of Port Stanley (mean magnetic dip = 46.3 deg ) is very favorable. (auth)
- Research Organization:
- Gujarat Univ., Ahmedabad, India
- NSA Number:
- NSA-29-008592
- OSTI ID:
- 4420350
- Journal Information:
- Indian J. Radio Space Phys., v. 2, no. 1, pp. 22-25, Other Information: Orig. Receipt Date: 30-JUN-74
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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