Fig. 10.From: High latitude TEC fluctuations and irregularity oval during geomagnetic stormsLocation of TEC fluctuations derived from GPS measurements in geomagnetic local time for July and November 2004 storms. The intensity of fluctuations is indicated with the following symbols: 0.5–1.0 TECU/min—white, 1.5–2.0 TECU/min—black.Back to article page