Study of a microflare observed with SUMER and TRACE

Details Study of a microflare observed with SUMER and TRACE Study of a microflare observed with SUMER and TRACE

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.confq..11g&link_type=abstract

10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io

Astronomy and Astrophysics

Astronomy

Scientific paper

We study a GOES-A1 microflare, observed in active region NOAA 8541 on May 15, 1999 with TRACE images, SUMER spectra and MDI magnetograms. In TRACE filtergrams of 171A and 195A, the microflare is composed of two interacting, 20Mm long, loops. SUMER observations include four spectral lines: the Si II 1533A (a chromospheric line), the C IV 1548A, 1550 A (transition region lines) and the Ne VIII 770 A (a coronal line). These spectra record the impulsive stage of the microflare, which appears as a bright feature at the west footpoint of the TRACE loops. In an area adjacent to the microflare we observe, for the first time on the solar disk, a region where the lines intensity ratio 1548A/1550A equals to 4 which means that resonant scattering dominates the emission process. Over the microflare, the SUMER spectral lines are blue shifted, indicating upflows due to explosive evaporation, as well as red shifted, indicating, cooling downward motions. Moreover, the C IV microflare spectral profiles, indicate upflows of ~200 km/s even if most of them are damaged due to the SUMER detector over exposure, while the Si II 1533A profiles are self-reversed due to opacity effects.

Affiliated with

Also associated with

No associations

Rating

Study of a microflare observed with SUMER and TRACE 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 Study of a microflare observed with SUMER and TRACE, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Study of a microflare observed with SUMER and TRACE will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-911106