Bright photospheric areas surrounding sunspot groups at 5700 Å

Sunspot groups at various central angles were chosen to study what appears to be an enhanced surrounding area, even at small central angles. The continuous band of observation was 200 Å wide, centered at 5700 Å. The enhancement has been seen before, but only at higher frequencies, as by Jayanthan in the ultraviolet. Four years of sunspot pictures from March 1957 to March 1961, were inspected and no instance of the non-appearance of the enbancement was noted. An attempt to show proof was made by photometry and by high contrast prints of the areas around groups at different central angles. It was shown that more than half of the flux deficit reappears in this enhancement.