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Щоденний бюлетень про сонячну та геомагнітну активність від SIDC

Випущено: 2021 Apr 23 1230 UTC

Прогноз SIDC

Сонячні спалахи

C-class flares expected, (probability >=50%)

Геомагнетизм

Quiet (A<20 and K<4)

Сонячні протони

Quiet

	10 см потік	Ap
23 Apr 2021	080	010
24 Apr 2021	081	008
25 Apr 2021	080	011

Бюлетень

Numerous B-class and C-class flares were reported during last 24 hours. All the flaring activity originated from the two sunspot groups Catania groups 86 and 87 (NOAA AR 2817 and NOAA AR 2816). Presently Catania sunspot group 86 (NOAA AR 2817) is rotating over the West solar limb, which will somewhat decrease the reported flaring activity. However, we can still expect B-class and C-class flares in the coming hours, originating mostly from Catania sunspot group 87 (NOAA AR 2816). M-class flares are possible but not very probable. Faint and slow partial halo CME (reported yesterday), was first seen in the SOHO LASCO C2 field of view at about 06:12 UT on April 22. The CME had angular width of about 160 degrees and projected line of the sight speed of about 450 km/s (as reported by CACTUS software). The CME was Earth directed and we might expect its arrival late evening on April 25. There were no other Earth directed CMEs during last 24 hours. During last 24 hours the proton flux levels remained at background level.

The greater than 2MeV electron flux is still above the 1000 pfu threshold, and it is expected to remain so in the coming 24 hours. The 24h electron fluence is at moderate to high level and is likely it will stay so in the next 24 hours.

Earth is presently inside the slow solar wind (speed of about 390 km/s), and the interplanetary magnetic field magnitude is 4 nT. The solar wind originating from the small, negative polarity equatorial coronal hole (reached central meridian in the morning of April 20), can be expected at Earth in the coming hours. During last 24 hours geomagnetic conditions were quiet. We expect quiet to unsettled geomagnetic conditions in the coming hours.

Розрахунок міжнародної кількості сонячних плям станом на сьогодні (ISN): 033, за даними 27 станцій.

Сонячні індекси за 22 Apr 2021

Число Вольфа, Катанія	///
Сонячний потік 10 см	084
AK Chambon La Forêt	014
AK Wingst	006
Розрахунковий індекс Ap	005
Розрахункова міжнародна кількість сонячних плям	043 - За даними 36 станцій

Зведення помітних подій

Надано Центром Аналізу Даних Сонячного Впливу (SIDC)© - SIDC - Оброблено SpaceWeatherLive

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