The Sun Ties Its 21st-Century Record for Solar Flares

On November 7, 29 flares were recorded on the Sun—the highest daily total of the 21st century. That many events had been recorded only twice before, and this time all the flares came from a single sunspot group, numbered 4566.

What changed

The latest surge in activity matched the previous daily high. Exactly 29 flares were observed on May 5, 2022, and December 10, 2024. This made November 7 the third time this century that the total reached that number.

Solar activity did not reach 30 flares in a day, measured by Moscow time—a threshold not yet recorded in the 21st century. The gap between the record and that mark is one event.

One sunspot group instead of several

What made the November 7 observation notable was that all 29 flares occurred within a single sunspot group, designated 4566. At the time, it was located near the center of the solar disk. On the two previous days with the same number of flares, the events occurred in several active regions.

Group 4566 had already shown activity before the record-setting day. On November 5, an M3.6-class flare was recorded there—the strongest since early October. Class M denotes powerful solar flares; in this case, the laboratory noted the event’s small area and the active region’s high complexity.

Why group 4566 matters

A daily record shows how many flares were recorded over a given period, but it does not mean they were all equally powerful. The key common feature of the November 7 events was that they all originated in one active region. To assess what may happen next, it is therefore important to monitor not only the total number of flares but also the condition of group 4566.

After the M3.6 flare on November 5, specialists did not rule out further events in the group. This caveat alone does not indicate how many flares may follow or when: solar activity changes, and a record daily total does not set a schedule for future events.

What remains unknown

The next numerical threshold—30 flares in a day, measured by Moscow time—has not yet been reached. It is also unclear whether group 4566 will remain active after November 7 or contribute less to daily totals. The answer depends on further observations of this region of the Sun.