Here is the current forecast discussion on space weather and...

Here is the current forecast discussion on space weather and geophysical activity, issued 2017 Jul 23 1230 UTC.

Solar Activity

24 hr Summary: Solar activity was very low. There were no numbered sunspots on the visible disk. No Earth-directed CMEs were observed in available satellite imagery.

OF NOTE: Early on 23 Jul, STEREO-A EUVI 195 imagery observed a pair of eruptions near the eastern limb at about 23/0055 UTC and 23/0325 UTC, respectively. Shortly after, STEREO-A COR2 imagery observed a pair of fast-moving CMEs off the NE and SE limbs with the second resulting in an asymmetric halo signature. In addition, both LASCO C2 and C3 imagery observed a full-halo CME. The location of these events place them near dead center on the backside of the disk with no Earth-directed component expected.

Forecast: Solar activity is expected to be very low on days one through three (23-25 Jul).

Energetic Particles

24 hr Summary: The greater than 2 MeV electron flux was at normal to high levels with a peak of 3,619 pfu observed at 22/1710 UTC. The greater than 10 MeV proton flux remained at background levels during the reporting period.

Forecast: The greater than 2 MeV electron flux is expected to reach high levels over the next three days (23-25 Jul). The greater than 10 MeV proton flux is expected to remain at background levels throughout the forecast period.

Solar Wind

24 hr Summary: Solar wind parameters reflected the continued influence of a positive polarity CH HSS. Solar wind speed started and ended the period near 525 km/s with a peak speed of near 630 km/s observed at about 23/0330 UTC. Total field measurements ranged between 1 and 7 nT while the Bz component varied between +/- 6 nT. The phi angle was in a positive orientation.

Forecast: Solar wind parameters are expected to decrease over days one and two (23-24 Jul), returning to nominal conditions by day three (25 Jul).

Geospace

24 hr Summary: The geomagnetic field was at quiet to unsettled levels due to continued positive polarity CH HSS effects.

Forecast: The geomagnetic field is expected to be at quiet to isolated active levels on day one (23 Jul) and quiet to unsettled levels on day two (24 Jul) as CH HSS effects persist. By day three (25 Jul), mostly quiet conditions are expected as CH effects gradually taper.

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