| |
 |
| During the last week, solar activity was high on 30 May, moderate on 31 May and 2-4 Jun, and low for the rest of the time. Eight sunspot regions (AR4092, AR4096, AR4099-AR4101, AR4104-AR4106) were on the visible disk with eleven M-calss flares produced. The F10.7 index ranged from 128 sfu to 164 sfu. Affected by the full-halo coronal mass ejection (CME) associated with the M8.1-class flare on 30 May, moderate solar proton event (SPE) occured from 31 May to 2 Jun, with the peak flux of >10 MeV protons at geosynchronous orbit reaching 666 pfu. Due to the effect of a coronal hole high speed stream (CH HSS), the solar wind speed increased to approximately 800 km/s on 30-31 May, resulting in geomagnetic activity reaching minor storm levels for 3 hours and active levels for 24 hours. Due to the combined effects of a coronal hole high-speed stream and the CME from 31 May, the solar wind speed rose to around 1100 km/s from 1-3 Jun, during which geomagnetic activity reached major storm levels for 18 hours, moderate storm levels for 12 hours, minor storm levels for 27 hours, and active levels for 3 hours. Influenced by a coronal hole high-speed stream, the solar wind speed increased to about 830 km/s on 4-5 Jun, with geomagnetic activity reaching minor storm levels for 6 hours and active levels for 12 hours. Geomagnetic conditions were quiet to unsettled during the remaining period. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 30-31 May, and 4 Jun. | |
| Within the next week, solar activity is expected to be low to moderate with a chance for M-class flares. Due to the effects of a coronal hole high speed stream and CME from 3 Jun, the geomagnetic field is expected to be at active to minor storm levels on 6-7 Jun, it will be at active levels on 10-11 Jun due to another coronal hole high speed stream and mainly quiet to unsettled for rest of time. | | Published: 2025-06-06 06:30 UTC Forecaster: 026/040 |
|
| During the last week, solar activity was low. Eight sunspot regions (AR4099-AR4100, AR4105-AR4115) were on the visible disk without any M-calss and above flares produced. The F10.7 index ranged from 115 sfu to 142 sfu. No solar proton event occurred. Due to the effects of a coronal hole high speed stream and the CME on 3 Jun, the geomagnetic activity reaching minor storm level for 3 hours and active levels for 9 hours on 7 Jun. Due to the effect of another coronal hole high speed stream, the solar wind speed reached a peak of about 510 km/s and the geomagnetic activity reached active levels for 12 hours during 8-9 Jun. Due to the effects of another coronal hole high speed stream and the CME on 8 Jun, the solar wind speed reached a peak of about 500 km/s and the geomagnetic activity reached minor storm levels for 12 hours and active levels for 18 hours during 11-12 Jun. It was quiet to unsettled for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 6 Jun. | |
| Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. Due to the effects of the CME on 8 Jun and another recurrent coronal hole high speed streams, the geomagnetic field is expected to reach isolated active to storm levels during 13-14 Jun, and be quiet to unsettled for the rest of the time. | | Published: 2025-06-13 06:30 UTC Forecaster: 042/029 |
|
| During the last week, solar activity reached high levels on 14-17 Jun and 19 Jun, moderate levels on 13 Jun and low levels on 18 Jun. Twelve sunspot regions (AR4105, AR4107, AR4109-AR4118) were on the visible disk with two X-class flares and twelve M-calss flares produced. The F10.7 index ranged from 136 sfu to 161 sfu. No solar proton event occurred. Due to the effects of a coronal hole high speed stream and the CME on 8 Jun, the geomagnetic field reached moderate storm levels for 15 hours and minor storm levels for 15 hours on 13-14 Jun. Due to the effect of another coronal hole high speed stream, the geomagnetic field reached active levels for 3 hours on 16 Jun. Due to the effects of coronal hole high speed stream and the CME on 15 Jun, the geomagnetic field reached active levels for 6 hours on 18-19 Jun. It was quiet to unsettled for the rest of time. | |
| Within the next week, solar activity is expected to be low to moderate with chances for M-class and above flares. Due to the effect of the CME on 17 Jun, the geomagnetic field is expected to reach isolated active to storm levels on 20 Jun. Due to the effect of recurrent coronal hole high speed streams, the geomagnetic field is expected to reach isolated active to storm levels on 24-26 Jun, and to be quiet to unsettled for the rest of the time. | | Published: 2025-06-20 06:30 UTC Forecaster: 025/012 |
|
| During the last week, solar activity reached moderate levels on 20 Jun and low levels for the rest of time. Ten sunspot regions (AR4111, AR4114-AR4122) were on the visible disk with two M-calss flares produced. The F10.7 index decreased from 130 sfu to 117 sfu. No solar proton event occurred. Due to the effects of a coronal hole high speed stream, the solar wind speed reached a peak of about 780 km/s and the geomagnetic field reached minor storm levels for 3 hours and active levels for 21 hours during 25-26 Jun. It was quiet to unsettled for the rest of time. | |
| Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. Due to the continuous effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach isolated minor storm levels on 27 Jun. Due to the effect of another recurrent coronal hole high speed stream, the geomagnetic field is expected to reach isolated active to minor storm levels during 1-2 Jul. It will be mainly quiet to unsettled for the rest of the time. | | Published: 2025-06-27 06:30 UTC Forecaster: 016/042 |
|
| During the last week, solar activity was low. There were 16 active sunspot regions on the visible disk(AR4117, AR4118, AR4120-AR4133) with no M-class or above flares produced. The F10.7 rose from 118 sfu to around 130 sfu. No solar proton events occurred. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed rose to about 780 km/s on 27 Jun, and the geomagnetic field reached minor storm level for 3 hours and active levels for 6 hours. Due to the effects of the CME from 28 Jun and the recurrent coronal hole high speed stream, the geomagnetic field reached active levels for 6 hours on 3 Jul. From 28 Jun to 2 Jul, the flux of electrons greater than 2 MeV on geosynchronous orbit reached minor storm levels. | |
| Within the next week, solar activity is expected to be low to moderate. Due to the effect of the recurrent coronal hole high speed stream, the geomagnetic field will reach active to minor storm levels on 4-6 Jul. Due to the effect of another recurrent coronal hole high speed stream, the geomagnetic field will reach active to minor storm levels on 8-10 Jul. | | Published: 2025-07-04 06:30 UTC Forecaster: 039/026 |
|
|
