Active Region Crossing Central Meridian on 17.Nov.96

Oxygen IV

Sulfur V

Nitrogen IV

Continuum at 785 Å

Continuum at 767 Å

SUMER can produce 2-dimensional images of the Sun by staring (for example) at the central meridian and letting the Sun rotate underneath. The images above were put together from 551 exposures of 115 seconds each, taken simultaneously in a wavelength band that covers various temperatures. The slit width and the rotation of the Sun are both 0.3 arcsec per exposure. The north-south extension of the slit is 120 arcsec, therefore the image is stretched out of proportion in east-west direction.

For images in the right scale, please refer to the "Standard" picture section.

To identify the active region located at Sun center, e.g. use the SOHO/MDI magnetogram taken at the beginning of the SUMER scan, or the SOHO/EIT image taken after the end.

• Visualization of line shift
• Visualization of line width
• Information on spectral window
• The explosive event of 03:20 UT

IED, 14.Aug.97