Evolution of extratropical cyclones during disturbed geomagnetic conditions

Abstract

An analysis of temperature changes in warm and cold air masses of extratropical cyclones in both hemispheres with their movement during geomagnetic disturbances at the minimum of solar activity was performed. The location and movement of air masses of cyclones was determined by thermobaric maps at the 500 hPa level. In the conditions of a classical cyclogenesis, a warm air mass cools from day to day, while the cold air mass warms up. During geomagnetic disturbances, favorable conditions for increasing intensity and cyclone lifetime are formed, i.e., in a warm air mass, the temperature increases at heights lower than 300 hPa, while a cold air mass warms up more slowly. The distributions of the temperature of air masses of extratropical cyclones were shown to change due to the changes in geomagnetic activity.