The effect of disturbance on the day-to-day variability of Sq

Abstract

Other workers have recently shown that the apparent day-to-day variability of S, is appreciably reduced when days with bay-like disturbances are removed from the analysis.In this paper, it is shown that when these days are removed, there is only a small effect on the scale o f the spatial coherence of Sq-ranges and therefore the regional scale of the correlation must be a real feature of S, range variability rather than an effect due to disturbance.

Principal components of quiet time temporal variability of equatorial and low‐latitude geomagnetic fields

“…Midnight values of H have been taken as the average of the values for 2330 LT on the previous day and 0030 LT, where LT refers to 75°E local time. Any noncyclic variations in the data have been removed in the manner suggested by Mann and Schlapp [] to obtain the hourly values of Δ H at Tirunelveli (TIR) and Alibag (ABG) for 794 IQ days, when data from both the locations were available. In the present study, the EEJ is treated as a distinct current system from the Sq current system as far as variability of the EEJ currents is considered.…”

“…The distinctly different distributions of the amplitudes of the second and third principal components for ΔH EEJ for weak electrojet days during summer and winter solstice months, which are compatible with the known seasonal pattern of occurrence of the morning and afternoon counter electrojet (CEJ) [Rastogi, 1974;Fambitakoye andMayaud, 1976: Mayaud, 1977;Vichare and Rajaram, 2011], are also discussed in the context of these alternate scenarios. Mann and Schlapp [1985] to obtain the hourly values of ΔH at Tirunelveli (TIR) and Alibag (ABG) for 794 IQ days, when data from both the locations were available. In the present study, the EEJ is treated as a distinct current system from the Sq current system as far as variability of the EEJ currents is considered.…”