查看星期二, 21 4月 2026歷史檔案

SIDC 太陽影響數據分析中心的每日公告

發布時間: 2026 Apr 21 1231 UTC

SIDC太陽影響數據分析中心的預報

太陽閃焰

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

地磁

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

太陽質子

Quiet

	10公分通量	Ap
21 Apr 2026	109	016
22 Apr 2026	114	020
23 Apr 2026	120	010

太陽活動區和耀斑

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. A total of 4 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 825 (NOAA Active Region 4419) is the largest and most magnetically complex (Beta-Gamma) regions on disk. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

日冕物質拋射

No Earth directed Coronal Mass Ejections (CMEs) were observed in the past 24 hours. Further analysis of the CME seen LASCO-C2 data around 16:00 UTC on April 19 show that it is not expected to impact the Earth.

日冕洞

SIDC Coronal Hole 157 (equatorial coronal hole extending to the polar-south with a positive polarity) has started crossing the central meridian on April 21. (Other crossing times : April 04)

太陽風

Over the past 24 hours the solar wind parameters were under the influence of a high-speed stream associated with SIDC Coronal Hole 147. The solar wind speed ranged between 444 km/s to 573 km /s. The total interplanetary magnetic field ranged from 4 to 10 nT, with the Bz reaching a minimum of -8 nT. The phi-angle was mainly in the negative sector (directed towards the Sun), with periods in the positive sector. In the next 24 hours solar wind conditions are expected to remain enhanced.

地磁

The geomagnetic conditions reached minor storm conditions globally and locally (Kp 5 & K BEL 5) in the last 24 hours. Active to minor storm conditions are expected over the next 24 hours.

質子通量水平

The greater than 10 MeV GOES proton flux was at background levels and is expected to remain at background levels over the next 24 hours.

地球靜止軌道上的電子通量

The greater than 2 MeV electron flux, as measured by GOES-18 was above the 1000 pfu alert threshold between 16:55 UTC and 23:45 UTC on April 20, in the past 24 hours. The flux as measured by GOES-18 and GOES-19 is expected to fluctuate around the alert threshold over the next 24 hours. The 24-hour electron fluence was at normal levels over the past 24 hours and is expected to remain at these levels over the next 24 hours.

今日估計的國際太陽黑子數（ISN）：053，基於23個觀測站。

太陽活動指數 20 Apr 2026

卡塔尼亞沃爾夫數	044
10厘米太陽通量	105
AK Chambon La Forêt	041
AK Wingst	030
估計地磁Ap指數	028
估計國際太陽黑子數	042 - 基於32個觀測站

顯著活動摘要

由太陽影響數據分析中心提供© - SIDC - 由 SpaceWeatherLive處理

所有時間均採用 UTC 時間

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