Helioseismic mapping of the Sun’s far (invisible) hemisphere
indicates the presence of a strong active region that may rotate into Earth
view around late June 12. This active region is marked by a circle with 100% probability.
The figure below shows its Carrington‑longitude location, highlighted by
the yellow dashed line in three maps separated by seven days: June 10 (top),
June 3 (middle) and May 27 (bottom). The
dark portions of each map represent the far hemisphere, while the grayscale
corresponds to the front side. The bright features on the far side mark active
regions that cannot be observed directly from Earth.
A careful analysis shows that the active region of interest
was either in a very early stage of development when this portion of the Sun
was on the front side, or it had not yet evolved. It is not clearly visible in
the bottom map. Although there was an active region at a similar longitude, its
latitude differs by about 10 degrees. The middle map shows only a weak farside
signature, but the region becomes clearly visible in the top map, with strong
helioseismic signals and a 100% probability of appearing on the front side. The
maps from June 3 to June 10 indicate that the region has evolved over time and
strengthened significantly in the past couple of days. Strong active regions of
this kind tend to enhance magnetic activity and may trigger severe space‑weather
events.
It is worth noting that several other active regions have rotated to the farside and are currently progressing through their farside transit.
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