This image captures the full disk of the Sun in the elusive Helium-I 7065 Å wavelength, a rarely imaged spectral line that lies in the far red part of the spectrum. Using a spectroheliograph, several high-resolution scans were carefully acquired, stacked, and processed to subtract the continuum and isolate the faint helium signal.

While the 10830 Å and 5875.6 Å (D3) helium lines are more commonly targeted, imaging the Sun in He I 7065 is exceptionally rare due to the line's subtlety and the high technical demands involved. This may be the first known full-disk image of the Sun in this band, revealing delicate filamentary structures and activity regions otherwise hidden in more conventional wavelengths. The result is a novel glimpse into solar dynamics through an uncommon helium filter.

Using the same gear as yesterday, the N150/750, the motorized filter wheel, the green and Calcium K line filters and the cooled ASI 178MM, all guided by the soapbox, I imaged Venus. On this day the atmosphere was kind enough to allow me to photograph not only a still, but also the movement, even though the second frame shows a considerable decrease in details.

Copyright: Pál Váradi Nagy