Space Weather Forecast Discussion
| Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center |
| Issued: 2021 Aug 01 1230 UTC |
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| Solar activity was very low as the visible solar disk remained spotless.
Beginning at about 31/1605, GOES-16 SUVI 304 imagery observed plage
brightening and coronal dimming in the vicinity of plage Region 2849
(S27, L=074). GOES-16 x-ray data recorded a long-duration B2.4 event.
STEREO-A COR2 coronagraph imagery observed a CME beginning at about
31/1753 UTC. Analysis/WSA Enlil modeling is ongoing to determine if the
ejecta has an Earth-directed component. |
| Very low solar activity is expected to continue on 01-03 Aug. |
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| The greater than 2 MeV electron flux was at normal to moderate levels
while the greater than 10 MeV proton flux maintained background levels. |
| The greater than 2 MeV electron flux is expected to be at normal to
moderate levels and the greater than 10 MeV proton flux is expected to
remain at background levels on 01-03 Aug. |
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| Solar wind parameters were at nominal levels. Solar wind speeds
decreased from 450-400 km/s. Total field and Bz were at benign levels.
Phi switched from positive to negative near 31/2000 UTC. |
| Possible CME activity from 28 Jul is anticipated to pass close to Earth
on 01 Aug. If Earth experiences any effects, they are expected to be
weak, and might linger through 02 Aug. |
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| The geomagnetic field was at quiet levels. |
| The geomagnetic field is expected to be at quiet to unsettled levels on
01-02 Aug, with isolated active intervals possible on 01 Aug due to
possible influences from the close proximity of a passing transient. |
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