Journal of Atmospheric and Terrestrial Physics
Short paperEnhancement of the equatorial anomaly in the topside ionosphere daring magnetic storms
References (8)
- et al.
J. atmos. terr. Phys.
(1967) - et al.
J. atmos. terr. Phys.
(1964) - et al.
Radio Sci.
(1969) - et al.
J. geophys. Res.
(1967)
Cited by (18)
Ionosonde observations of the effects of the major magnetic storm of September 22–26, 1999 at equatorial station in west Africa
2018, Journal of Atmospheric and Solar-Terrestrial PhysicsCitation Excerpt :descent) of the F layer, reminiscing a fountain (resp. reverse fountain) effect, in agreement with earlier observations (Raghavarao and Sivaraman, 1973; Chan and Walker, 1984). We should notice however that, for example, the times at the start of the increase in the plasma density during these depletion events are slightly delayed as compared to those of the downward motions τ1, τ3 and τ6 (Fig. 4b).
The response of the ionosphere over Ilorin to some geomagnetic storms
2014, Advances in Space ResearchCitation Excerpt :Many morphological features of the F2-layer are related to zonal Ey electric field variations. Electric field observations show the decrease of eastward (during sunlit hours) electric field Ey resulting in positive foF2 storm effect, while the enhancement in the eastward Ey resulting in the NmF2 decrease and the equatorial anomaly enhancement (Raghavarao and Sivaraman, 1973; Turunen and Rao, 1980; Fejer, 1981; Adeniyi, 1986). Meanwhile neutral gas composition changes take place in the equatorial F2-region during geomagnetic disturbances as well (Prölss, 1982, 1993).
Storm time spatial variations in TEC during moderate geomagnetic storms in extremely low solar activity conditions (2007-2009) over Indian region
2013, Advances in Space ResearchCitation Excerpt :The TEC map in Fig. 3(e) also shows that the crest of EIA has extended beyond the normal latitude of ∼18°N and is formed at ∼22°N. It indicates the role of prompt penetration electric field during the main phase of the storm that led to the strong development of EIA (Raghavarao and Sivaraman, 1973). But if we compare the EEJ values on 8 and 9 March which are very similar, it can be argued that PPE was not strong enough to push the EIA to higher latitudes.
Local time variation of equatorial temperature and zonal wind anomaly (ETWA)
1998, Journal of Atmospheric and Solar-Terrestrial PhysicsPolar thermospheric Joule heating, and redistribution of recombination energy in the upper mesosphere
1990, Journal of Atmospheric and Terrestrial PhysicsOn the structure and circulation of the polar thermosphere under magnetically quiet conditions
1988, Journal of Atmospheric and Terrestrial Physics