Composite Map of Far and Near Solar Hemispheres. Line-of-sight magnetic field in the Sun’s near hemisphere is rendered in blue-gray, in Gauss. Seismic map of the Sun’s far hemisphere is rendered in yellow. The far-side seismic image maps a phase shift between solar acoustic noise with periods of about five minutes embarking into the solar interior from the Sun’s near hemisphere and its echos from respective locations in the far hemisphere. This phase shift is expressed here as a travel-time perturbation in seconds.

NOAA active region 12192 is now approaching the Sun’s east limb and is about to rotate back into direct view from Earth in a few days. This was the active region that presented a monster sunspot, the biggest sunspot in nearly 25 years, that hosted seven X-class flares in 9 days.

Reports say that the sunspot’s seismic signature having grown considerably during its ongoing transit of the the Sun’s far hemisphere. The far-side seismic monitor shows a signature even more intense than in the region’s previous transit of the far hemisphere. Indeed, the seismic signature has grown considerably throughout just the current transit of the far hemisphere.

The far-side signature is presently centered at Carrington 247W–14S, which is scheduled to rotate across the east limb at about 13-November. Given the 30-degree span in latitude of the seismic signature, the western extremity of the region can be expected to pass across the east limb about a day before this. Helioseismic maps of showing AR12192 and other regions in the Sun’s far hemisphere can be accessed at Stanford’s Joint Science Operations Center.