查看星期日, 21 5月 2023歷史檔案

SIDC 太陽影響數據分析中心的每日公告

發布時間: 2023 May 21 1231 UTC

SIDC太陽影響數據分析中心的預報

太陽閃焰

M-class flares expected (probability >=50%)

地磁

Active conditions expected (A>=20 or K=4)

太陽質子

Warning condition (activity levels expected to increase, but no numeric forecast given)

太陽活動區和耀斑

Solar flaring activity remained at moderate levels over the past 24 hours with five M-class flares and several C-class flares being detected. The largest flare was an M8.9 flare, peaking at 12:35 UTC on May 20, associated with NOAA Active Region (AR) 3311(beta- gamma-delta class). AR 3311 remains the largest and most magnetically complex region on the solar surface and produced the majority of the flaring activity. Low flaring activity was also produced by NOAA AR 3305 (beta class) and 3312 (beta class).Other regions on the disc have simple configuration of their photospheric magnetic field (alpha and beta) and did not show any significant flaring activity. The flaring activity is expected to remain moderate with possible M-class flare and a chance of X-class flare.

日冕物質拋射

Few coronal mass ejections (CME) and flows were observed in the available SOHO/LASCO coronagraph imagery and automatically detected by the Cactus tool over the past 24 hours. However, no clear Earth-directed coronal mass ejections were identified.

日冕洞

An equatorial coronal hole of negative polarity started to transit the central meridian yesterday evening. An associated high speed stream in in-situ solar wind measurements is expected for Apr 24.

太陽風

The solar wind environment near Earth was under the influence of the fast solar wind streams associated to the equatorial coronal hole of negative polarity. The solar wind speed has reached a maximum value of 620 km/s at around 00:50 UTC today, May 21 and has showed a gradually decreasing trend after that, decreasing to values of around 480 km/s. The total interplanetary magnetic decreased to the values around 4 nT. The southward interplanetary magnetic component, Bz, fluctuated between -7 nT and 4 nT. The magnetic field orientation was predominantly in the negative sector (field directed towards the Sun). The solar wind conditions are expected to remain elevated for the next days with a low probability for further minor enhancements from late on May 21, due to the CME associated with a filament eruption in the southwest sector on May 17th, which may have a glancing blow at Earth.

地磁

The geomagnetic conditions over the past 24 hours were quiet to active. Quiet to unsettled conditions are expected over the next 24 hours with remaining minor chances of isolated active and minor storm periods during next days due to influence of the HSS and possible glancing blow from the CME.

質子通量水平

The greater than 10 MeV proton was at the nominal levels in the past 24 hours. The proton flux is expected to remain below 10 pfu threshold over the next day, with a small chance that a particle event occurs in association with an X-class flare or a coronal mass ejection.

地球靜止軌道上的電子通量

The greater than 2 MeV electron flux was below the 1000 pfu threshold and is expected to remain below this threshold for the next days.The 24h electron fluence was at normal level. The electron fluence is expected to be at normal levels in the next days.

太陽活動指數 20 May 2023

顯著活動摘要

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