[Propagation+Space Weather] Today's Space Weather Forecast Discussion on 2021 May 31 1230 UTC

[nw7us@sunspotwatch.com]

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Here is the current forecast discussion on space weather and geophysical activity, issued 2021 May 31 1230 UTC.

Solar Activity

24 hr Summary: Solar activity was very low. Region 2827 (N12E22, Dao/beta) exhibited minor growth this period while Region 2828 (S31E26, Axx/alpha) was in decay. No Earth-directed CMEs were observed in available data.

Forecast: Solar activity is expected to be very low over 31 May-02 Jun.

Energetic Particle

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

Forecast: The greater than 2 MeV electron flux is expected to be normal to moderate over 31 May-02 Jun and the greater than 10 MeV proton flux is expected to persist at background levels throughout the forecast period.

Solar Wind

24 hr Summary: Solar wind parameters were indicative of a return to a nominal solar wind environment. Solar wind speeds decreased from initial values near 450 km/s to end-of-period readings between 350-400 km/s. Total field strength varied between 1-4 nT and Bz remained near 0 nT. The phi angle was variable and solar wind density decreased below 5 ppcm.

Forecast: Ambient solar wind conditions are expected to prevail for the remainder of 31 May. Solar wind parameters are likely to become enhanced on 01-02 Jun due to the influence of a negative polarity CH HSS and the anticipated glancing-blow arrival of the 28 May CME.

Geospace

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

Forecast: The geomagnetic field is expected to be mostly quiet through the remainder of 31 May. Unsettled and active conditions are likely on 01-02 Jun due to the influence of a negative polarity CH HSS and the anticipated glancing-blow arrival of the 28 May CME.

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