Перегляд архіву четвер, 20 травня 2021

Щоденний бюлетень про сонячну та геомагнітну активність від SIDC

Випущено: 2021 May 20 1231 UTC

Прогноз SIDC

Сонячні спалахи

Quiet conditions (<50% probability of C-class flares)

Геомагнетизм

Minor storm expected (A>=30 or K=5)

Сонячні протони

Quiet

	10 см потік	Ap
20 May 2021	076	028
21 May 2021	076	007
22 May 2021	077	007

Бюлетень

Two active regions (ARs) visible on the disk, NOAA AR 2822 (Catania 93, alpha magnetic field configuration, rotating over the west limb) and AR 2824 (Catania 96, decayed to alpha magnetic field configuration). Solar activity is very low, only B-class flares were seen in the past 24 hours. The situation is expected to remain the same for the next 24 hours.

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraphic imagery in the last 24 hours.

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 in the past 24 hours and is expected to remain so. The 24-hour electron fluence was at normal levels in the past 24 hours and is expected to remain so.

In the last hours, the solar wind speed has shown a gradual increase from about 320 km/s to 410 km/s, accompanied by similar increases in density and strong magnetic fields (with intensity up to 17 nT and Bz reaching -13 nT). This marks the arrival of the high speed stream from the coronal hole that crossed central meridian late on May 15. The interplanetary magnetic field polarity was mostly negative (towards the Sun). The solar wind speed is expected to increase more in the next 24 hours.

Geomagnetic conditions have been quiet to unsettled (KDourbes 1-3, Kp 1-3). Minor storm periods, and up to isolated major storm periods, can be expected due to the high speed solar wind stream arriving to the Earth.

Розрахунок міжнародної кількості сонячних плям станом на сьогодні (ISN): 019, за даними 23 станцій.

Сонячні індекси за 19 May 2021

Число Вольфа, Катанія	037
Сонячний потік 10 см	076
AK Chambon La Forêt	014
AK Wingst	007
Розрахунковий індекс Ap	006
Розрахункова міжнародна кількість сонячних плям	025 - За даними 31 станцій

Зведення помітних подій

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

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