AL index dependence on the solar wind input revisited

Relationship between the PC and AL indices during repetitive bay-like magnetic disturbances in the auroral zone

“…As a result, the level of the magnetic activity preceding the next repetitive bay-like disturbance onset turns out to be statistically related to the previous disturbance intensity: the greater the recurrent magnetic disturbance, the larger is magnetic activity during the recovery phase, the higher is level of activity preceding the next disturbance onset. This fact can be treated as the AL value dependence on the magnetic activity ''history'', in agreement with conclusion of Petrukovich and Rusanov (2005).…”

Solar wind density effect on the night-side geomagnetic activity ( index)

“…The effect of IMF fluctuations on AL was rather small and consistent with the recent thorough investigation of Borovsky and Funsten (2003). Petrukovich and Rusanov (2005) compared AL prediction by such a driving function (e.g., Eq. (1)) with that of the artificial neural network (ANN) model.…”

“…Comparison with case studies, demonstrating density (and dynamic pressure) acting on substorm activity, is hard to perform, since it is impossible in each particular case to distinguish between the triggering effect, changing merely time history of an event, and modification of the event energetics, which is of interest for our study. Petrukovich and Rusanov (2005) with the same procedure also checked the influence of some other solar wind characteristics. The effect of Mach numbers, solar wind temperature, b, IMF B x was negligible.…”

“…We used the alternative iterative method of driving function selection (Petrukovich and Rusanov, 2005). The algorithm is easy to understand, considering the first example ( Fig.…”

<I>a<sub>p</sub></I>-index solar wind driving function and its semiannual variations

“…2). Details of the process and interpretation were described by Petrukovich (2006); Petrukovich and Rusanov (2005). Figure 2a presents average a p for logarithmically spaced bins of the driving function values (here, E=V B s ), taken for the same 3 hours, and separately for different V .…”