Słońce z SDO 20.10.2021

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tafig
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Słońce z SDO 20.10.2021

Post autor: tafig »

Ostatnio wspomniałem o nowej grupie na południowo wschodnim brzegu tarczy słonecznej, która wtedy jeszcze nie posiadała swojego numeru. 18 tegoż miesiąca nadano numer 2886. Grupa jedno-plamowa z symetrycznym półcieniem. Wokół plamy nie można dostrzec żadnych mniejszych plam, stąd typ CV Hsx. Zorza jakby zmniejszyła swój obszar, Kp 3-4. Na zdjęciu STEREO coś czai się za południowym wschodem tarczy.

COMMENT:
Solar activity was at very low levels. NOAA Active Region (AR)
2886 (Catania sunspot region 64) has rotated further onto the disk and has
a simple magnetic configuration (Alpha). The small sunspot (Catania sunspot
region 63) that emerged yesterday has since decayed. Solar activity is
expected to be very low over the next 24 hours with a slight probability of
C-class flares from NOAA AR 2866

No Earth directed CMEs have been detected in the available coronagraph
imagery.

The greater than 10 MeV proton flux was at nominal levels over the past 24
hours and is expected to remain so for the next 24 hours. The greater than
2 MeV electron flux remained below the 1000 pfu alert threshold and is
expected to remain below this level during the next 24 hours. The 24h
electron fluence was at nominal levels and is expected to remain so.

The solar wind (DSCOVR) showed an enhancement in the Interplanetary
Magnetic Field (IMF) over the past 24 hours. The total magnetic field
reached a maximum value of 12 nT. The Bz varied between -8 and +10 nT. The
solar wind speed ranged between 340 km/s and 390 km/s. The solar wind speed
and magnetic field are expected to be enhanced on Oct 19 and 20, due to the
influence of the High Speed Stream (HSS) associated with the with the small
positive Coronal Hole (CH) and subsequently the larger negative polarity
extension of the southern polar CH which began to cross the central
meridian on Oct 16.

Geomagnetic conditions reached active levels (NOAA Kp and local K Dourbes
recorded values of 1-4 and 1-3, respectively) over the past 24 hours.
Geomagnetic conditions are expected to be unsettled to active on Oct 19 to
20, due to the arrival of the aforementioned HSS.

TODAY'S ESTIMATED ISN : 010, BASED ON 07 STATIONS.
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