A&A 403, 287-295 (2003)
Explosive events and transition region blinkers:
Time variability of non-Gaussian quiet Sun EUV spectra
H. Peter and A. Brkovic
Kiepenheuer-Institut für Sonnenphysik, 79104 Freiburg, Germany
(Received 16 December 2002 / Accepted 21 February 2003)
The transition region (TR) from the chromosphere
to the corona of the Sun and solar type stars is a very dynamic regime.
On the Sun at least two major observational classes of transients can be seen:
explosive events and blinkers.
Besides these transients there is also a more steady spectral component in
transition region lines that accounts for the deviation of the line profile
from a (single) Gaussian shape, i.e. for enhanced wings that are well
described by a second broad Gaussian, a tail component.
The present paper discusses the spectral properties of these features in
order to learn more about a possible connection between blinkers, explosive
events and tail components.
This paper will show that explosive events are most probably not related to
the tail components or to transition region blinkers.
During a blinker not only the intensity rises, as described by many CDS
studies, but also the line width and shift are changing, as we show
with SUMER spectra.
The variation in line shift and width is closely related to the intensity
The line width drops to very small values at the midst of a blinker, almost
reaching the thermal line width, while at the same time the Doppler shifts
reach a maximum value.
From this we may conclude that blinkers are driven by events in the
chromosphere heating a loop asymmetrically and powering a strong laminar
flow through the loop.
Sun: chromosphere --
Sun: corona --
transition region --
Sun: UV radiation
Offprint request: H. Peter, email@example.com
© ESO 2003
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