The Sun in Lyman Continuum

The Sun in O IV and Lyman Continuum, observed by SUMER 26.Feb.96

[Full Picture] Oxygen IV (790 Å)

[Full Picture] Continuum (804 Å)

[Full Picture] Continuum (812 Å)

The Sun seen in in the emission line of Oxygen IV at 790 Å (transition region, temperature 140 000 K) and in the Continuum radiation at 804 and 812 Å (chromosphere, temperature 10 000 K).

Although slit and telescope appear to be centered incorrectly for this study, it was possible to construct three almost complete full disk pictures from 9254 raster images each. The raster step size was 1.52 arcsec, the exposure time 6 seconds per raster step. The intensities were calculated by simply integrating spectral windows of approx. 2.25 Å at 790, 804, 812 Å, resp.. Therefore, all three pictures could be sampled simultaneously in approx. 16 hours.

The images above are binned by setting 5 arcsec x 5 arcsec to 1 pixel.

View

full disk at 790 Å with 2x2 binning
full disk at 804 Å with 2x2 binning
full disk at 812 Å with 2x2 binning
active region in O IV and Cont. enlarged
spectral information

IED, 27.Apr.97