Here is a montage of the 25 frames of the animation showing the actual intensity variation from frame to frame (a few of the frame numbers are displayed). I eliminated this intensity variation in the animation (using histogram normalization in ImageJ) because it made the central frames of the animation too dim to view. As in the animation, the wavelength offset between adjacent disk images is 0.054 Angstroms.
- 2018-08-08-083838-10xx_flat-div_skew-corr_Montage_01-25_siz_lbls.png (837.46 KiB) Viewed 2068 times
The montage I posted here was considerably downsized from the original.
I've uploaded a higher resolution version (half original size) with full labelling here:
Thumbnail:
https://www.astrobin.com/full/361701/0/
Full resolution:
https://www.astrobin.com/full/361701/0/?real=&mod= (needs time to load.)
If I take the mean disk intensity in each frame and plot it (blue crosses) on a measured spectrum it matches the H alpha line profile pretty closely, as expected but always a pleasant surprise when things work out!
- Montage_110946-23frame-avg_083838-10xx-Int-plot.png (162.37 KiB) Viewed 2068 times
The image to the left is an average over 23 frames of a (spectral) calibration video taken with the spectroheliograph. The yellow box shows the region of the spectrum (approximately) that is plotted on the right side of the figure. The spectrum is calibrated in wavelength using line positions from the BASS2000 solar spectrum.
Cheers, Peter.
