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Title: IEC Near the Peak of the Equatorial Anomaly in Indian Zone during Solar Maximum
Authors: Modi, R P
Iyer, K N
Issue Date: Jun-1988
Publisher: NISCAIR-CSIR, India
Abstract: Ionospheric electron content (lEC) measurements using Faraday rotation technique from Rajkot (lat. 22.3° N; long. 70.7°E; subionospheric dip latitude 16.5° N) near the peak of the equatorial anomaly for the last solar maximum (1980) are reported. The diurnal variation shows tendency for the post-sunset enhancements in IEC during equinox and winter. The winter daytime IEC values are ~29% higher than the summer values indicating seasonal anomaly. Results are compared with similar measurements in low solar activity condition. The IEC variations are also compared with Nmax variations from nearby (Ahmedabad) ionosonde data. The day-to-day variability of IEC is also studied. The results are discussed in terms of the effect of E x B drift on the diurnal variation of the IEC during high sunspot condition and composition changes contributing to seasonal changes of IEC and slab thickness.
Page(s): 98-102
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.17(3) [June 1988]

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