查看星期三, 31 3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 Mar 31 1231 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
31 Mar 2021	074	007
01 Apr 2021	074	004
02 Apr 2021	074	009

公告

Solar activity was at low levels over the past 24 hours with no sunspot on the visible solar disc. The Catania sunspot group 83 (NOAA-AR 2812) has fully decayed and turned into a plage. The Catania sunspot group 82 (NOAA-AR 2811) that turned into a plage yesterday on Mars 30 produced a B7.4-class flare peaking on Mars 30, at 20:18 UTC (when the plage was located at 48 degree longitude and 20 degree latitude). The B-class flare was associated with the coronal mass ejection ejected with a speed of about 400 km/s and observed in LASCO images on Mars 31 around 05:15 UTC. Solar activity is expected to remain at low levels.

No Earth-directed coronal mass ejections (CMEs) was observed in the available coronagraph imagery.

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 was below the 1000 pfu threshold in the past 24 hours and is expected to remain so during the next 24 hours. The 24h electron fluence is at normal levels in the last 24 hours and is expected to stay at normal levels for the next 24 hours.

The solar wind parameters (ACE and DSCOVR) were mostly close to nominal levels over the past 24 hours with mild enhancements: The solar wind speed ranged between 305 km/s and 410 km/s . The interplanetary magnetic field magnitude reached about 8.6 nT, and Bz components varied between -6.8 nT and 4.2 nT. The slight enhancement was due to the high-speed stream effects associated with the small patchy equatorial coronal holes (in the south hemisphere, with negative polarity). The Earth is expected to remain in mostly slow solar wind regime for the next 24-hour period. A large equatorial coronal hole (with a positive magnetic polarity) is currently facing Earth. The high-speed stream associated with this coronal hole is expected to reach Earth in about 2-3 days.

Geomagnetic conditions were mostly quiet (Kp and K-Dourbes: 0-2) with some unsettled periods (Kp and K-Dourbes: 3). Quiet conditions are expected with possible short periods of unsettled conditions due to the slight enhancement of the solar wind especially if the interplanetary magnetic field Bz component remain negative for a longer period of time.

今日估計的國際太陽黑子數（ISN）：000，基於21個觀測站。

太陽活動指數 30 Mar 2021

卡塔尼亞沃爾夫數	012
10厘米太陽通量	080
AK Chambon La Forêt	011
AK Wingst	005
估計地磁Ap指數	004
估計國際太陽黑子數	012 - 基於28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

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