Aktuální sluneční data:
25.únor 2021 - 12:57 UT(GMT)
Mezinárodní číslo slunečních skvrn :
Sluneční záblesky : Quiet conditions (<50% probability of C-class flares)
Geomagnetická situace : Active conditions expected (A>=20 or K=4)
Sluneční protony : Quiet
Komentář : The solar activity has been mostly quiet over the past 24 hours.
Regions Catania 74/NOAA AR 2804 and Catania 75/NOAA 12805 had a low flaring
activity. The solar flaring activity is expected to remain at low levels
for the next 24 hours.
No Earth directed Coronal Mass Ejections (CME) were observed in the
available coronagraphic imagery.
The greater than 10 MeV proton flux was at nominal levels in the past 24
hours and is expected to remain so in the next 24 hours. The greater than 2
MeV electron flux remained over the 1000 pfu threshold for the second half
of Feb 24. It is expected to have values around the threshold for the next
24 hours, as a response to the possible arrival on Feb 24 of the CME that
took place on Feb 20. The greater than 2 MeV electron fluence remained on
moderate levels in the past 24 hours. It is expect to be at moderate levels
for the next 24 hours.
The past 24 hours the solar wind speed ranged between 430 km/s and 510
km/s. The total magnetic field ranged between 3 nT and 10 nT. The Bz
component fluctuated between -8 nT and 8 nT. The orientation of the
Interplanetary Magnetic Field (IMF) fluctuated from the negative (towards
the Sun) to the positive sector (away from the Sun). The solar wind
parameters reflect the effects of a possible glancing blow of the sides of
the CME from Feb 20. An extension of the northern positive Coronal Hole
(CH) is expected to cross the Central Meridian (CM) tomorrow. The same
applies for the negative polarity southern CH crossing the solar disc. The
associated high speed streams should be expected about Feb 29 and not Feb
26 as was previously erroneously reported.
The geomagnetic conditions over the past 24 hours were active (K Dourbes
and Kp=4), as a possible response to the CME glancing blow. They are
expected to return to mainly quiet to unsettled levels for the next 24
hours, with a slight chance of an isolated active event (K Dourbes=4).
Předpověď sluneční aktivity pro období : February 19 - February 25, 2021
Poslední fotografie ze SOHO / SDO:
Různé barvy snímků prozrazují odlišné vlnové délky - každá
vlnová délka je vyzařována plynem o určité teplotě: oranžová: 80 000 °C,
modrá: 1 000 000 °C, zelená: 1 500 000 °C, hnědá: 2 500 000 °C.
He II/Si XI 30,4 nm
80 000 °C
Fe IX/X 17,1 nm
1 000 000 °C
Fe XII 19,5 nm
1 500 000 °C
Fe XV 28,4 nm
2 500 000 °C