Soft X-ray oscillations from AT Mic: Flare plasma diagnostics

Details Soft X-ray oscillations from AT Mic: Flare plasma diagnostics Soft X-ray oscillations from AT Mic: Flare plasma diagnostics

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006astl...32..569s&link_type=abstract

Astronomy Letters, vol. 32, Issue 8, p.569-573

Astronomy and Astrophysics

Astronomy

3

Pacs Numbers 95.85.Nv - 96.60.Qe - 97.10.Sj - 97.30.Nr

Scientific paper

We consider the flare oscillations from the active red dwarf AT Mic detected with the XMM-Newton space observatory in the soft X-ray energy range (0.2 12 keV). Following Mitra-Kraev et al. (2005a), we associate the observed oscillations with a period of ≈750 s with the excitation of a standing slow magnetoacoustic (SMA) wave in a coronal loop. The damping of flare loop SMA oscillations is shown to be governed by electron thermal conduction. We have estimated the plasma density (≈3 -10^10 cm-3) and the minimum magnetic field strength (≈100 G) in the region of flare energy release. The adopted model is consistent with the results of a spectral analysis of the soft X-ray emission. The piston mechanism is assumed to be responsible for the excitation of loop SMA oscillations.

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