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In an earlier study, Thampi et al. (2006) have shown that the strength and\udasymmetry of Equatorial Ionization Anomaly (EIA), obtained well ahead of the\udonset time of Equatorial Spread F (ESF) have a definite role on the\udsubsequent ESF activity, and a new "forecast parameter" has been identified\udfor the prediction of ESF. This paper presents the observations of EIA\udstrength and asymmetry from the Indian longitudes during the period from\udAugust 2005–March 2007. These observations are made using the line of sight\udTotal Electron Content (TEC) measured by a ground-based beacon receiver\udlocated at Trivandrum (8.5° N, 77° E, 0.5° N dip lat) in India. It\udis seen that the seasonal variability of EIA strength and asymmetry are\udmanifested in the latitudinal gradients obtained using the relative TEC\udmeasurements. As a consequence, the "forecast parameter" also displays a\uddefinite seasonal pattern. The seasonal variability of the EIA strength and\udasymmetry, and the "forecast parameter" are discussed in the present paper\udand a critical value for has been identified for each month/season. The\udlikely "skill factor" of the new parameter is assessed using the data for a\udtotal of 122 days, and it is seen that when the estimated value of the\ud"forecast parameter" exceeds the critical value, the ESF is seen to occur on\udmore than 95% of cases

Seasonal dependence of the &quot;forecast parameter&quot; based on the EIA characteristics for the prediction of Equatorial Spread F (ESF)

Seasonal dependence of the "forecast parameter" based on the EIA characteristics for the prediction of Equatorial Spread F (ESF)