Solar Activity

» 24 hr Summary: Solar activity was at low levels, with the largest flare of the past 24-hours being a C8.9 at 08/1543 UTC from Region 4414 (N15W62, Dro/beta), which was accompanied by Type-III radio bursts. Most of the C-class activity came from either this region or Region 4409 (N01W71, Esi/beta-delta), which has developed a delta spot in its intermediary area. All remaining spots were either stable or in slight decay, with Region 4406 (N07, L=183) rotating over the West limb by the end of the reporting period.

Coronal activity was observed in CCOR-1, LASCO and STEREO available imagery during the period. Of the four eruptions, one was far-sided, one was too narrow plus too far north of the ecliptic to have any Earth-directed component, and two had the potential for Earth-directed components. These eruptions where the eruptions seen off the eastern limb in LASCO C2 starting at 07/2336 UTC and at 08/0536 UTC. The first was associated with a C2.4 flare from Region 4414 (07/2320 UTC), while there was no clear source for the second. Modeling indicates these eruptions will pass behind Earths orbit and no impact is anticipated.

Eruptions potentially associated with the C8.9 are currently being analyzed.

» Forecast: Solar activity is expected to be at low levels over 09-11 Apr, with a chance for M-class (R1-R2/Minor-Moderate) flares and a slight chance for X-class (R3/Strong or greater) flares, driven primarily by the flare potential of Regions 4409 and 4414.

Energetic Particle

» 24 hr Summary: The greater than 2 MeV electron flux was at high levels with a peak flux of 7,322 pfu at 08/1555 UTC. The greater than 10 MeV proton flux was at background levels and exhibiting slight contamination from the high electron flux levels.

» Forecast: The greater than 2 MeV electron flux is expected to continue to reach high levels through 09 Apr, with a drop to moderate on 10-11 Apr. The greater than 10 MeV proton flux is expected to remain at background levels.

Solar Wind

» 24 hr Summary: Solar wind parameters reflected the high range of nominal conditions. Wind speeds averaged 400 km/s. Total magnetic field (Bt) averaged around 5 nT while the North-South (Bz) component varied between +/- 5 nT. Phi angle was oriented predominantly towards the Sun (negative).

» Forecast: Solar wind parameters are expected to remain at nominal conditions on 09 Apr, before becoming disturbed on 10 Apr and elevated on 11 Apr, due to the anticipated arrival of a CIR and positive polarity coronal hole high speed stream.

Geospace

» 24 hr Summary: The geomagnetic field was at quiet levels.

» Forecast: The geomagnetic field is expected to be at mostly quiet levels with isolated unsettled periods on 09 Apr. G1 (Minor) storming conditions are anticipated on 10-11 Apr due to the arrival of the aforementioned CIR.


Prepared by:
The U.S. Dept. of Commerce, NOAA, SWPC