Summary: Astronomy & Astrophysics manuscript no. 15269 c ESO 2010
November 9, 2010
Dynamics and plasma properties of an X-ray jet from SUMER,
EIS, XRT, and EUVI A & B simultaneous observations
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
Received date, accepted date
Context. Small-scale transient phenomena in the quiet Sun are believed to play an important role in coronal heating
and solar wind generation. One of them called "X-ray jet", is the subject of our study.
Aims. We intend to investigate the dynamics, evolution, and physical properties of this phenomenon.
Methods. We combine multi-instrument observations obtained simultaneously with the SUMER spectrometer onboard
SoHO, with EIS and XRT onboard Hinode, and with EUVI/SECCHI onboard the Ahead and Behind STEREO space-
crafts. We derive plasma parameters such as temperatures and densities as well as dynamics by using spectral lines
formed in the temperature range from 10 000 K to 12 MK. We also use an image difference technique to investigate the
evolution of the complex structure of the studied phenomenon.
Results. With the available unique combination of data we were able to establish that the formation of a jet-like event is
triggered by not one, but several energy depositions, which are most probably originating from magnetic reconnection.
Each energy deposition is followed by the expulsion of pre-existing or newly reconnected loops and/or collimated flow
along open magnetic field lines. We derived in great detail the dynamic process of X-ray jet formation and evolution.