Ionospheric Event 2015-06-23

Contact: iono@gnss.be

SUMMARY OF THE EVENT: Ionospheric disturbances occurred from the evening of the 22nd of June for more than a day. In the evening of the 22nd, ionospheric disturbances were split in two with a TEC increase up to 30 TECu in the Southern part of Europe and a TEC decrease of 15 TECu in the Northern part. During the day of the 23rd, a major decrease up to 20 TECu was observed in the whole European area. This negative ionospheric storm is linked with the solar CME of the 21st of June associated with an ejection of protons and high geomagnetic disturbances.

VTEC Time Series

Figure 1: VTEC Time Series

VTEC point locations

Figure 2: VTEC extracting locations


Figure 1 shows the time evolution of the Vertical Total Electron Content (VTEC) (in red) extracted from the near-real time VTEC maps at 3 different latitudes (Figure 2): a) Northern part (top), b) Brussels (middle) and c) Southern part (bottom). Also shown, the model based on the median from the 15 previous days (in grey).

About this event, see also:

  • VTEC maps during this event: here
  • Comparisons with the median of the last 15 days: here
  • about the origin of the ionospheric disturbances: www.sidc.be