Parameters of Indian equatorial electrojet

Abstract

Using a comprehensive three dimensional model of equatorial eleotrojet, parameters of the Indian equatorial eleotrojet for winter of 1972 are computed and are compared with those obtained using uniform band model. The electrojet estimated using three dimensional model is found to be wider but weaker in intensity than that obtai¬ned using uniform band model. A comparison of these (three dimensional model) parameters with those obtained elsewhere for the Indian region for September. 1958 shows that the intensity of the electrojet in 1958 was about thrice of that in 1972. The width of the electrojet is found to reduce appreciably with increase in solar activity and supports the suggestion of Onwumechilli (1967) that the electrojet is narrower when ever it is strong. In the three dimensional model the return currents of the electrojet for winter 1972 are found to be maximum around 11.3° dip latitude in the Indian equatorial region.