查看星期四, 18 2月 2021歷史檔案

SIDC 太陽影響數據分析中心的每日公告

發布時間: 2021 Feb 18 1230 UTC

SIDC太陽影響數據分析中心的預報

太陽閃焰

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

地磁

Quiet (A<20 and K<4)

太陽質子

Quiet

	10公分通量	Ap
18 Feb 2021	073	003
19 Feb 2021	074	004
20 Feb 2021	075	007

公告

The solar activity has been quiet over the past 24 hours. One small bipolar sunspot (Catania 72) has just emerged on the visible solar disc, however, no significant flaring activity was recorded. The solar activity is expected to remain at low levels over the next 24 hours with small chances of C-class flare from the newly emerged sunspot.

No Earth-directed coronal mass ejections was observed in the available coronagraph 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 under the 1000 pfu threshold and is expected to remain so in the next 24 hours.

Over the past 24 hours, the solar wind speed decreased from 460 km/s to 400 km/s. The total magnetic field was around 5 nT and the Bz component ranged between -5.6 nT and 3.2 nT. The solar wind conditions are expected to return towards a slow solar wind speed regime the next day. A large equatorial coronal hole with negative magnetic polarity and located in the southern hemisphere is currently facing Earth. The high-speed streams associated with this coronal hole is expected to impact the solar wind environment near Earth in about 3 days.

The geomagnetic conditions over the past 24 hours were quiet with few short periods of unsettled condition. It is expected to remain quiet for the next day.

今日估計的國際太陽黑子數（ISN）：011，基於14個觀測站。

太陽活動指數 17 Feb 2021

卡塔尼亞沃爾夫數	000
10厘米太陽通量	072
AK Chambon La Forêt	012
AK Wingst	///
估計地磁Ap指數	008
估計國際太陽黑子數	000 - 基於21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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