SUMER study #1761: Network Evolution

• date,time: 12.Jun.98, 16:07 UT - 13.Jun.98, 06:38 UT
• field of view: 100 arcsec W (effectively 130 arcsec by Solar rotation), 170 arcsec N - 130 arcsec S
• slit: 1.0 arcsec x 300 arcsec (number 2)
• raster step size: 0.0 arcsec (effectively 0.22 arcsec by Solar rotation)
• exposure time: 90 seconds
• telemetry: 6(lines)*581 images of 50 spectral x 360 spatial pixels (format 8)
• compression: quasilog-min-max (method 5)
• wavelengths:
  790.20 Å on reference pixel 105 of Detector B
  787.05 Å on reference pixel 175 of Detector B
  775.97 Å on reference pixel 422 of Detector B
  770.41 Å on reference pixel 547 of Detector B
  764.90 Å on reference pixel 670 of Detector B
  760.10 Å on reference pixel 778 of Detector B
• rotation compensation: standard
• binning: no spectral, no spatial
• on-board flatfield correction: no

As an example, the intensity of Nitrogen IV for the whole time series is shown above. This kind of image does not show the structures on the solar surface in the right scale, it is rather stretched out of proportion in the east-west direction. If you click on the image, you will find a page with a collection of intensity images in this format, showing various temperatures.

Below, approximately 4 to 5 raster pixels are binned such that the images appear in the right scale. Of course, using this format, temporal information is lost. If you click on the various small images you will find full resolution images. These images do not only reflect the structure of the solar surface but also the dynamics of changing intensity as seen through the vertical slit; they are thus a mixture of local and temporal information: horizontally adjacent pixels e.g. cover almost the same solar area (75-80%) but at a different time (1.5 minutes earlier or later).

BTW: This could have been the last big two-dimensional map of the Sun taken by SUMER on SOHO (see SOHO/SUMER: Almost "last light"). But then, SOHO was recovered...

Ne VIII 770.4 (630 000 K)

O V 760.4 (230 000 K)

S V 786.4 (170 000 K)

O IV 790.2 (170 000 K)

N IV 765.1 (140 000 K)

N III 764.3 (78 000 K)

N II 775.9 (27 000 K)

IED, 07.Jun.00