Solar Activity

» 24 hr Summary: Solar activity returned to low levels, with frequent high B-level/low C-level activity mostly on the East limb. The largest flare of the period was a partially occulted C8.7 flare on the East limb at 23/2325 UTC. Regions 4472 (S14E15, Cri/beta), 4473 (S09E26, Hrx/alpha), and 4474 (N03W89, Hsx/alpha) exhibited substantial decay and fragmentation this period. Region 4470 (N07W24, Bxo/beta) decayed nearly to plage. Two new groups were numbered this period: Region 4476 (N08E11, Dai/beta) had slow but continual flux emergence in its intermediary area and Region 4477 (S13E68, Bxo/beta) rotated further into view as a relatively stable and unremarkable bipolar group.

NSO GONG white light and NASA/SDO continuum imagery began showing a large penumbra rotating onto the south-eastern limb (at approximately S06 latitude), which is likely the leading section of the large spot group observed by ESA/NASA Solar Orbiter. It is anticipated to rotate into Earth-view on 24 Jun. Once the spot group fully rotates on-disk, it will be analyzed and numbered.

No Earth-directed CMEs were observed in available coronagraph imagery, though a large farside eruption was observed to the northeast and is first visible in SOHO LASCO C2 imagery at 23/1848 UTC and GOES CCOR1 imagery at 23/2000 UTC.

» Forecast: Solar activity is expected to continue at predominately low levels on 24-26 Jun, with an increasing chance for M-class (R1-R2/Minor-Moderate) flares primarily due to the potential of the farside region(s) anticipated to soon rotate onto the visible disk.

Energetic Particle

» 24 hr Summary: The greater than 2 MeV electron flux was at normal to moderate levels. The greater than 10 MeV proton flux was at background levels.

» Forecast: The greater than 2 MeV electron flux is expected to continue at normal to moderate levels over 24-26 Jun. The greater than 10 MeV proton flux is expected to persist at background levels through 26 Jun.

Solar Wind

» 24 hr Summary: Solar wind parameters were at background levels for the majority of the reporting period, with total magnetic field strength (Bt) at or below 6 nT, no significant periods of southward Bz, phi largely negative, and solar wind speeds approximately 350 km/s. At 23/1056 UTC, a magnetic transient began passing through the near-Earth environment: Bt began increasing and eventually reached 11 nT at 23/1858 UTC, when the wind speed also increased to approximately 375 km/s, with Bz deflecting northward and maintaining an average of ~+4 nT for several hours.

» Forecast: Enhanced solar wind conditions are expected to prevail through 26 Jun due to the anticipated onset of negative polarity CH HSS influences and a potential minor glancing blow from a CME that left the Sun on 20 Jun.

Geospace

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

» Forecast: Periods of active conditions are likely through 26 Jun due to the anticipated onset of negative polarity CH HSS and glancing blow influences.


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