Space Weather Forecast Discussion
Forecast Discussion
Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
Issued: 2017 Jul 20 1230 UTC

Solar Activity
.24 hr Summary...
Solar activity was low as Region 2665 (S06, L=118) produced a C1 flare at 20/0001 UTC. No numbered regions are currently on the visible disk. No Earth-directed CMEs were observed in available coronagraph imagery.
Solar activity is expected to be very low on days one through three (20-22 Jul).

Energetic Particle
.24 hr Summary...
The greater than 2 MeV reached high levels this period with a peak level of 13630 pfu. The greater than 10 MeV proton flux was at or near background levels this period.
The greater than 2 MeV electron flux is expected to reach high levels over the next three days (20-22 Jul). The greater than 10 MeV proton flux is forecast to be at or near background levels for days one through three (20-22 Jul).

Solar Wind
.24 hr Summary...
Solar wind parameters were at nominal levels. Solar wind speeds averaged near 380 km/s. Total field strength was between 1 and 7 nT while the Bz component was mostly northward. The phi angle switched between negative and positive throughout the period, ending in a positive orientation.
Solar wind parameters are expected to show a return to background levels for days one and the first half of day two (20-21 Jul). An increase in solar wind activity is forecast for the second half of day two and into day three (22 Jul), with increases in solar wind velocity, temperature, and magnetic field, as a recurrent +CH HSS is forecast to become geoeffective.

.24 hr Summary...
The geomagnetic field was quiet.
The geomagnetic field is forecast to be quiet on day one (20 Jul). Quiet to unsettled conditions are forecast for day two (21 Jul), followed by unsettled to active conditions on day three (22 Jul) as CH HSS effects are anticipated.
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