Analysis of Solar Active Regions and Activity from 14/2100Z to 15/2100Z: Solar activity was high. Region 649 (S10E40) produced two impulsive X-class flares: an X1 at 0141 UTC and an X1 at 1824 UTC. Both of these events originated near the delta configuration in the dominant trailer spot. Although the spot is not large, the close proximity of opposite polarity spots is creating an area of strong magnetic gradients. There was also some magnetic flux emergence to the south of this spot during the past 24 hours. Both of the events were compact and bright. LASCO coronagraph data did not show a CME in association with the first X1 event. As of forecast issue time the LASCO data seemed to indicate a slow, relatively faint CME off the east limb in association with the second X1 event.

Solar activity is expected to be moderate to high, with Region 649 as the dominant source for activity. Additional M-class flares are expected and there is a fair chance for additional major flare activity out of 649, especially if magnetic flux continues to emerge.

The geomagnetic field was quiet to unsettled during the past 24 hours.

The geomagnetic field is expected to be mostly unsettled tomorrow (16 July) with a chance for some isolated active periods at higher latitudes. Conditions should be predominantly unsettled for the 2nd and 3rd days (17-18 July).

  Observé       15 Jul 146
  Prévisionnel   16 Jul-18 Jul  140/140/140
  Moyenne des 90 derniers jours        15 Jul 098

  Observé Afr/Ap 14 Jul  006/009
  Estimé     Afr/Ap 15 Jul  007/010
  Prévisionnel    Afr/Ap 16 Jul-18 Jul  012/020-010/012-008/010