Solar alert

Issued on 2023 Jul 29 1240 UTC

The greater than 10 MeV proton flux crossed the 10 pfu threshold yesterday 23:50 UTC and the 100 pfu threshold today at 05:35 UTC. This high-flux event is associated with a Coronal Mass Ejection (CME) that can be see in LASCO/C2 images from 28 Jul 15:48 UTC onwards. The greater than 100 MeV proton flux was unaffected by the CME and has remained at nominal levels.

Issued on 2023 Jul 29 1249 UTC

A partial halo Coronal Mass Ejection (CME) was automatically detected by CACTus as launched yesterday 15:48 UTC. It has an estimated speed of 500 km/s and is associated with an M4 flare that took place on the west solar limb. There is a chance of directly affecting Earth's environment, otherwise, a glancing blow is to be expected in the first half of 1 Aug. Another partial halo CME can be seen in LASCO-C2 images as launched yesterday 23:12 UTC. This is associated with a large filament eruption that took place at the NE of the solar disk. This second CME is likely to arrive at Earth's environment at the same time as the first as it has a similar speed and was launched with only a few hours difference. Hence, the two CME are expected to be detected as one event at L1.

Reference for this alert

All Presto solar alerts