This page (revision-7) was last changed on 18-Apr-2021 19:12 by PeterYoung

This page was created on 19-Nov-2009 17:16 by PeterYoung

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HeIIOffLimb
HeIIOffLimb

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At line 71 added 16 lines
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!!!Variation of He II 256 profile across the limb
To further investigate the He II 256 line, a large raster obtained at the limb has been studied to see how the line profile varies crossing from the disk to the limb.
The raster was obtained on 2007 December 12 at 10:42 (cam_ar_limb) and uses the 2" slit to raster an area of 360" x 512". The observation covers a large active region, but the bottom of the raster covers a relatively quiet region.
He II 256 spectra were generated for 25 positions by averaging Y-pixels 5 to 40 for 25 X-pixels spaced at 7 pixel intervals, beginning with pixel 2 which is inside the limb. I.e., the X-pixels used were 2, 9, 16, 23, etc., up to 170. The spectra were creating using the routine eis_mask_spectrum by creating pixel masks for each position.
The 25 spectra that resulted are plotted in the image below. The limb is found at about X=860.
This page (revision-7) was last changed on 18-Apr-2021 19:12 by PeterYoungTop