Moderate M1.1 solar flare erupts at 06:27 UTC on July 1, 2026

A moderate M1.1 solar flare erupted at 06:27 UTC on July 1, 2026.

Today’s flares include a C-class radio sweep starting at 00:00 UTC and ending at 04:29 UTC, a radio burst at 02:31 UTC, and a flare from region 4479 starting at 03:59 UTC, peaking at 04:02 UTC, and ending at 04:14 UTC.

In 24 hours to 00:30 UTC on July 1, solar activity reached high levels, dominated by an X1.1 flare on June 30 at 20:50 UTC. The event was accompanied by Type II and IV radio emissions, a tenflare of 410 sfu, and evidence for a coronal mass ejection. Additional activity included an M5.8 flare from region 4475 at 12:57 UTC and a C9.1 flare from region 4478 at 19:58 UTC on June 30. The main active regions exhibited growth with new magnetic complexity developing in regions 4478 and 4479.

Solar activity is likely to reach moderate levels (R1 – Minor to R2 – Moderate radio blackouts) with a slight chance for X-class flares (R3 – Strong) due to the flare potential of regions 4475, 4478, and 4479.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4475 (S09W63 – Beta), AR 4477 (S14W31 – Beta), AR 4478 (S05W06 – Beta-Gamma-Delta), AR 4479 (N16W24 – Beta-Gamma-Delta), and AR 4480 (S18W30 – Beta).

Over the past 24 hours, the greater than 2 MeV electron flux remained at moderate to high levels with a peak of 5 687 pfu. The greater than 10 MeV proton flux stayed at background values. High electron flux values are expected on July 1 and July 3, with a likelihood of moderate values on July 2 due to the possible arrival of the June 27 CME. There is a slight chance of an S1 – Minor solar radiation storm from increased flare activity in regions 4475, 4478, and 4479.

Solar wind parameters were at nominal values until an interplanetary shock was observed at 11:02 UTC on June 30. Solar wind speed increased from about 330 km/s to 430 km/s, with the total interplanetary magnetic field peaking at 16 nT, and the Bz component showing southward values down to -11 nT. Enhanced solar wind conditions are expected to persist on July 1 as CME effects remain, with further enhancements possible late on July 1 and early July 2 due to the expected arrival of material from the June 27 CME. Conditions are forecast to return to nominal by July 3, pending more analysis.

The geomagnetic field was initially quiet but became unsettled to G1 – Minor geomagnetic storm levels following the arrival of the CME that departed the Sun on June 26. G1 – Minor geomagnetic storming is expected, with a chance for isolated G2 – Moderate storm intervals through early July 1. Conditions are expected to become unsettled to active on July 2 with possible CME arrival from June 27, returning mainly to quiet levels by July 3 depending on further CME analysis.