Fig. 2From: Characteristics of the atmospheric electric field and correlation with CO2 at a rural site in southern Balkans a Distributions of mean hourly PG values and b hourly standard deviations (STDs). Hourly means are categorized in 10 V m−1 bins, and STDs are in 2 V m−1 bins. The data refer to the period June 2011 to May 2012 under all weather (AW) conditions. The histogram of STD shows the distribution of the STD of 10-min means within each hourBack to article page