Solar Weather Forecast Updated 4-22-17


K-indices of 5 or greater indicate storm-level geomagnetic activity around earth.

:Product: Forecast Discussion
:Issued: 2017 Apr 22 1230 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
Solar Activity

.24 hr Summary...
Solar activity was very low. The largest solar event of the period was a
B9/Sf flare at 22/0034 UTC from Region 2651 (N12E23, Cao/beta). Region
2651 produced additional B-class flare activity and showed minor
development in its intermediate spot group. Region 2652 (N13E38) decayed
to plage. Region 2653 (S09E66, Hax/alpha) was stable and absent of
significant flare activity. There were no Earth-directed CMEs observed
in available satellite imagery.
Solar activity is expected to be very low with a chance for C-class
flare activity over the next three days (22-24 Apr).

Energetic Particles

.24 hr Summary...
The greater than 2 MeV electron flux was at normal to high levels with a
peak flux of 2,810 pfu observed at 21/1545 UTC. The greater than 10 MeV
proton flux remained at background values.

The greater than 2 MeV electron flux is expected to be at normal to
moderate levels on days one and two (22-23 Apr). High levels are likely
on day three (24 Apr) due to increased geomagnetic activity associated
with CH HSS effects and the likely passage of a transient feature. No
solar radiation storms are expected during the forecast period.

Solar Wind

.24 hr Summary...
Solar wind parameters, as measured by the DSCOVR spacecraft, were
indicative of combined effects of the 18 April CME and a recurrent,
negative polarity CH HSS. Wind speed increased from starting values near
500 km/s to approximately 750 km/s towards the end of the period. Total
field (Bt) ranged between 5 and 14 nT while the Bz component reached a
maximum southward value of -12 nT with several spans of sustained
negative conditions. Phi angle abruptly transitioned from a positive
sector to a negative sector at approximately 21/1545 UTC.

Enhancements in the solar wind are likely to be observed over the next
three days (22-24 Apr) due to combined effects of the 18 Apr CME and the
influence of a recurrent, negative polarity CH HSS.


.24 hr Summary...
The geomagnetic field was at quiet to G2 (Moderate) storm levels due to
the likely passage of a transient feature combined with the onset of a
CIR preceding a recurrent, negative polarity CH HSS influence.

The geomagnetic field is expected to reach G2 (Moderate) storm levels
during the remainder of day one (22 Apr) due to the current enhancement
in the solar wind environment. G2 (Moderate) storm levels are likely on
day two (23 Apr) from the negative polarity CH HSS. Day three (24 Apr)
is expected to continue to observe active to G1 (Minor) storm levels
through the day as the CH HSS effects persists.


  1. September 22, 2016 at 1:36 PM

    Safeness While Fishing

    *** If getting a boat to fish, wear your life jacket and be certain that your passengers wear their own, too!

    *** Use foresight when baiting and taking out hooks

    *** Do not even fish on unauthorized rivers

    *** If operating an important houseboat, be careful of carbon monoxide build-up for the boat

    *** Obey the released speedlimits and wake warnings if getting a watercraft when fishing

    *** Bring along extra safety items which includes water, flashlights, maps, together with a cellphone or radio.

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