SUMER study #490: Slow active region scan (incl. flare)

Remarks: The study was initiated by J. G. Doyle (Armagh Obs.). It was intended as Si VIII density diagnostics in an active region. During the observation (after 03:18 UT), a flare occurred.

Due to solar rotation, the real east-west field of view is only a 44-arcsec subset of the nominal field of view stated above. Due to the slit image on the detector, the transmitted north-south field of view is only a 105-arcsec subset of the nominal field of view stated above.

The Fe XX line shift is calibrated under the assumption that the resting position of this line is situated 27 spectral pixels (or 1.15 Å) blue relative to the S I 1444 line.

Details will be published by J. Khan et al.


Complete spectral window


SUMER field of view in EIT images


taken approx. 23:00 UT the day before



line = *, continuum = +

Fe XX 1443.1/2 (8 000 000 K)


continuum and line intensity, line shift and width



line = *, continuum = +

Si VIII 1445.76 (850 000 K)


continuum and line intensity, line shift and width



line = *, continuum = +

C I 1432 (10 000 K)


continuum and line intensity, line shift and width



line = *, continuum = +

S I 1444.25 (10 000 K)


continuum and line intensity, line shift and width


Cont., S I, C I, Si VIII, Fe XX


IED, 17.Oct.00