13Aug SHG: 3rd and final installment.
Posted: Mon Aug 24, 2015 6:49 pm
Hello Everyone.
A final presentation of the 13Aug solar disk observed in four more wavelengths: a molecular band of CN (cyanogen radical) at 388.9 nm, and three (neutral) metal lines; Al at 396.1 nm (inspired by "highfnum" !), Ca at 422.7 nm and Mg at 518.4 nm. The contrast of these could probably be improved with wiser gamma settings in the future. I may have over-adjusted gamma to brighten the image somewhat in the dark line centres.
There's a notable trend of increasing "chromospheric" appearance of the solar disk as wavelength shortens to the violet. Sunspots (photospheric features) are strongly visible in the Mg image but progressively harder to see going through the series to the CN image. Maybe this trend is consistent with the fall-off of photospheric intensity with decreasing wavelength. Chromospheric features are swamped by photospheric light at longer wavelengths but less so in the violet.
Cheers.
Peter.
A final presentation of the 13Aug solar disk observed in four more wavelengths: a molecular band of CN (cyanogen radical) at 388.9 nm, and three (neutral) metal lines; Al at 396.1 nm (inspired by "highfnum" !), Ca at 422.7 nm and Mg at 518.4 nm. The contrast of these could probably be improved with wiser gamma settings in the future. I may have over-adjusted gamma to brighten the image somewhat in the dark line centres.
There's a notable trend of increasing "chromospheric" appearance of the solar disk as wavelength shortens to the violet. Sunspots (photospheric features) are strongly visible in the Mg image but progressively harder to see going through the series to the CN image. Maybe this trend is consistent with the fall-off of photospheric intensity with decreasing wavelength. Chromospheric features are swamped by photospheric light at longer wavelengths but less so in the violet.
Cheers.
Peter.