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Astronomy & Astrophysics manuscript no. (will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no.
(will be inserted by hand later)
Temporal evolution of di erent temperature plasma during
explosive events
M. S. Madjarska and J. G. Doyle
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
Abstract. 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 seconds 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: SoHO{SUMER: Explosive events: Lyman lines
1. Introduction
Observations made with the Naval Research Laboratory's
high resolution telescope and spectrograph (HRTS) re-
vealed the existence of high velocity small-scale events


Source: Armagh Observatory


Collections: Physics