A year later: Solar, heliospheric, and magnetospheric disturbances in November 2004

A year after the extreme events on the Sun, in the heliosphere, and on the Earth in October–November 2003 [Veselovsky et al. , 2004; Panasyuk et al. , 2004; Yermolaev et al. , 2005], a similar situation was also observed in November 2004. The main data observed when the strongest magnetic storm with Dst = –373 nT occurred on the Earth are presented in the paper prepared mainly by the participants of the last year’s collaboration of native researchers of extreme events. The disturbance of the Sun, solar wind, and magnetosphere during the considered period was weaker than during the similar period in 2003 with respect to a number of parameters; nevertheless, the presented data indicate that the decline phase of solar cycle 23 is one of the most active intervals over the entire period of comprehensive studies of the solar–terrestrial coupling owing to the events that occurred in autumn 2003 and 2004.