An investigation into the correlation of geomagnetic storms with tropospheric parameters over the South Pole

first_imgWe test the proposal that the Sun’s magnetic activity,communicated via the solar wind, provides a link betweensolar variability and the Earth’s climate in the Antarctictroposphere. The strength of a geomagnetic storm is oneindicator of the state of the solar wind; therefore, we use the dates of 51 moderate to strong winter geomagnetic stormsfrom the period 1961–1990 to conduct a series of superposedepoch analyses of the winter South Pole isobaric height andtemperature, at pressures of between 100–500mbar. UsingStudent’s t -test to compare the mean value of the pre- andpost-storm data sets, we find no evidence to support the hypothesis that there is a statistically-significant correlation between the onset of a geomagnetic storm and changes in the isobaric temperature or height of the troposphere and lower stratopshere over the South Pole during winter months. This concurs with a similar study of the variability of the troposphere and lower stratosphere over the South Pole (Lam and Rodger, 2002) which uses drops in the level of observed galactic cosmic ray intensity, known as Forbush decreases, as a proxy for solar magnetic activity instead of geomagnetic storms.last_img read more