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Eis40June...nobody
Eis40June

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Difference between version and

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[{ALLOW edit EISMainUsers}]
[{ALLOW view Anonymous}]
[{ALLOW view jsun,ms2,DaveWilliams,LouiseHarra}]
[{ALLOW edit jsun,ms2,DaveWilliams,LouiseHarra}]
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''40" slot, 15 scans, time duration: roughly 3 minutes''
''40" slot, 15 scans, time duration: roughly 6 minutes''
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[click here to see EIS data list | https://vsolar.mssl.ucl.ac.uk/SolarB/ThumbsConn_js2.jsp?startdate=2008-01-07+00%3A52&enddate=2008-01-08+00%3A52&Instrument=Thumbnail&Instrument=Movie&Submit=Submit+entry]
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''1" fitted velocity and the deconvolution velocity (side by side)''
!! Discussions
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[{Image src='images/eis40/eis1scan_vs_40scan_recon_vel_FOV.png'}]
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!! Conlusions and Discussions
* The deconvolution results are fairly ok to show loops, outflows/downflows (ie. blue/red shifts) for large-scale features, for example, see positions A to H (except F).
[{Image src='images/eis40/recon_int_vel_gimp.png'}]
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* For small-scale features, the reconstruction is not ok enough to show fine structures, for example, see position F on both images.
[{Image src='images/eis40/recon_int_vel_FOV_gimp.png'}]
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* Due to having only two projections (order_0 & 1 images), the deconvolution is not good enough to reveal small or changed-rapidly structures. But considering 1" scanning usually takes long time to finish (in this case, 80 minutes for a small FOV), it is also not good enough to observe fast-changing features. So it looks the slot deconvolution would be useful for, for example, synoptic velocity review(?)
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* A few issues during the deconvolution using __this datasets__ are caused by that the order-0 & 1 images come from different instruments: TRACE & EIS. The following factors are imported:
- CCD pixel size and resolution are different
- Instrument response is different, eg, response fuctions & PSF
- Spectral resolution is different, eg, TRACE covers wider range for FeXII 195 line compared with EIS 195 line (according to drw)
- images from TRACE & EIS may have different distortions and alias, which makes alignment difficulties
The above factors effect the image quality and thus alignment and reconstruction. However, the above factors can be reduced significantly if both order-0 & 1 images come from same instrument.
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* The large FOV image is needed as it helps alignment. But the data of EIS 40" slot needs to process to get full FOV image, which effects image quality. So if possible, using wider slot (eg. 266" slot) is better
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* If shifts order-plus images a few pixels along X-axis prior to deconvolution procedure, the reconstructed velocity maps will have slightly differences compared with no X shifts result:
''Full FOV deconvolution: X shifts are -3, -2, -1, 0, 1, 2, 3 pixels from left to right and top to bottom''
[{Image src='images/eis40/vel_iter_3pix.png'}]
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''Small FOV deconvolution: X shifts are -3, -2, -1, 0, 1, 2, 3 pixels from left to right and top to bottom''
[{Image src='images/eis40/vel_iter_3pix_FOV.png'}]
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EIS study 235 – PRY_slot_context for large slot context
__Details__:
40” slot, 14 scans, spectral window width: 48pix, Y-height: 512pixs\\
exposure time: 10s, duration: 3m6s, 15 lines\\
Data obtained on 07-Jan-2008, 5 fits files\\
TRACE 195A data is used as order-0 image: tri20080107.0600
__Details__:
FeXII 195A line, 1K by 1K size, 29 frames\\
processed by standard TRACE routines\\
[{Image src='images/eis40/eis_trace_flist.png'}]
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TRACE movie from tri200807107.0600 (Red color-table, log scale applied)
[click here | https://vsolar.mssl.ucl.ac.uk/eiswiki/images/eis40/trace20080107.0600.mov]
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EIS intensity and reconstructed velocity movie (Red color-table, log scale applied)\\
5 frames, time range: 07-Jan-2008 06:16 ~ 06:28
[click here | https://vsolar.mssl.ucl.ac.uk/eiswiki/images/eis40/eis_int_vel_v0_log.mov]
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For your information:
[Ignacio Ugarte-Urra: using 40" slot to do plasma diagnostics: electron density and DEM analysis|https://vsolar.mssl.ucl.ac.uk/eiswiki/Wiki.jsp?page=SlotDiagnostics]
This page (revision-17) was last changed on 18-Apr-2021 19:06 by JianSunTop