查看星期一, 23 8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 Aug 23 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

公告

Solar flaring activity is low, with only few B-class flares reported during last 24 hours. The flaring activity mostly originates from NOAA AR 2859. We expect such a low level of flaring activity to persist in the coming hours. There were few rather narrow and slow CMEs observed during last 24 hours, one associated with the prominence eruption close to southern polar coronal hole and a few associated with the flaring from the NOAA AR 2859 and from the behind of the East solar limb regions. Around midnight of August 22 the eruption of a large filament, situated close to the extension of the northern polar coronal hole (down to 25 degrees) was observed. The filament eruption was associated with the partial halo CME. The faint CME of angular width of about 120 degrees was first observed in the SOHO LASCO C2 field of view at about 07:24 UT today, after the data gap of several hours. Presently only two images of the CME are available. We will report on the additional information when data become available, as this CME is probably Earth-directed.

The greater than 10 MeV proton flux was at background levels in the past 24 hours, and we expect it will remain so in the next 24 hours. The greater than 2 MeV electron flux is bellow the 1000 pfu threshold. The 24h electron fluence is already for several days at normal to low levels and we expect it will stay so in the coming 24 hours.

Earth is presently inside the slow solar wind with velocity of about 300 km/s. The interplanetary magnetic field magnitude is 5 nT. The arrival of the solar wind originating from the extension of the northern polar coronal hole can be expected at Earth in the evening of August 24. During the last 24 hours the geomagnetic conditions were at the quiet to unsettled level and we expect they will stay so in the coming hours.

太陽活動指數 22 Aug 2021

顯著活動摘要

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