Small-scale flows in SUMER and TRACE high-cadence co-observations

Details Small-scale flows in SUMER and TRACE high-cadence co-observations Small-scale flows in SUMER and TRACE high-cadence co-observations

2008-02-18

arxiv.org/abs/0802.2477v1

Astronomy and Astrophysics

Astrophysics

7 pages, 6 figures, accepted by A&A

Scientific paper

10.1051/0004-6361:200809349

We report on the physical properties of small-scale transient flows observed simultaneously at high cadence with the SUMER spectrometer and the TRACE imager in the plage area of an active region. Our major objective is to provide a better understanding of the nature of transient phenomena in the solar atmosphere by using high-cadence imager and spectrometer co-observations at similar spatial and temporal resolution. A sequence of TRACE Fe IX/X 171 A and high-resolution MDI images were analysed together with simultaneously obtained SUMER observations in spectral lines covering a temperature range from 10 000 K to 1 MK. We reveal the existence of numerous transient flows in small-scale loops (up to 30 Mm) observed in the plage area of an active region. These flows have temperatures from 10 000 K (the low temperature limit of our observations) to 250 000 K. The coronal response of these features is uncertain due to a blending of the observed coronal line Mg X 624.85 A. The duration of the events ranges from 60 s to 19 min depending on the loop size. Some of the flows reach supersonic velocities. The Doppler shifts often associated with explosive events or bi-directional jets can actually be identified with flows (some of them reaching supersonic velocities) in small-scale loops. Additionally, we demonstrate how a line-of-sight effect can give misleading information on the nature of the observed phenomena if only either an imager or a spectrometer is used.

Affiliated with

Also associated with

No associations

Rating

Small-scale flows in SUMER and TRACE high-cadence co-observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Small-scale flows in SUMER and TRACE high-cadence co-observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Small-scale flows in SUMER and TRACE high-cadence co-observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-197864