EDP Sciences
Free access
Volume 382, Number 1, January IV 2002
Page(s) 319 - 327
Section The Sun
DOI http://dx.doi.org/10.1051/0004-6361:20011610

A&A 382, 319-327 (2002)
DOI: 10.1051/0004-6361:20011610

Temporal evolution of different temperature plasma during explosive events

M. S. Madjarska and J. G. Doyle

Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland

(Received 18 July 2001 / Accepted 9 November 2001 )

High cadence observations (10 s exposure time) obtained with the SUMER spectrometer on-board SoHO in the Ly 6 (20 000 K) and S VI (200 000 K) lines reveal new insight on the nature of explosive events. A time delay in the response of the S VI line with respect to the Ly 6 line has been observed, with the Ly 6 line responding with about 20-40 s earlier. A temporal series obtained with 30 s exposure time and covering the entire Lyman series plus O I, C II and S VI (temperature range from 15 000 to 200 000 K) has also been explored showing the response of all these lines during transient phenomena. New common features linking explosive events and blinkers were found. During explosive events, the central intensity increases between 1.6 and 2.0 times the pre-event value while the same range of intensity increase was already reported during blinker phenomena. On the other hand the maximum intensity increase in Ly 6 was only 13%.

Key words: Sun: activity -- Sun: atmosphere -- Sun: magnetic field -- Sun: UV radiation

Offprint request: M. S. Madjarska, madj@star.arm.ac.uk

© ESO 2002