Influence of heliospheric and geomagnetic activity on the dynamics of the relativistic electron fluxes in the Earth’s outer radiation belt around the minimum of the solar activity in 2008–2010

The relativistic electron flux in the Earth’s outer radiation belt generally decreased by almost three orders of magnitude during the minimum of cycle 23 in 2009. Such a behavior was possibly caused by very low geomagnetic activity during an extremely weak interplanetary field in that period. This decrease was replaced by an increase in the relativistic electron flux by two orders of magnitude during several months after the sunspot minimum at the beginning of 2010.