Pulsations of optical radiation during the flare of YZ CMi occurred on February 9, 2008
| Autor: | I. A. Verlyuk, Yu. G. Kopylova, M. V. Andreev, Alexander V. Stepanov, A. V. Sergeev, M. N. Lovkaya, Yu. T. Tsap, B. E. Zhilyaev, R. E. Gershberg, K. O. Stetsenko |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Coronal seismology
Physics Red dwarf Astrophysics::High Energy Astrophysical Phenomena Astronomy Astronomy and Astrophysics Coronal loop Astrophysics Magnetic field law.invention Luminosity Space and Planetary Science law Observatory Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Optical radiation Flare |
| Zdroj: | Kinematics and Physics of Celestial Bodies. 27:154-159 |
| ISSN: | 1934-8401 0884-5913 |
| DOI: | 10.3103/s088459131103007x |
| Popis: | One of the most powerful and long-lived flares on the active red dwarf YZ CMi is considered. The flare was observed in the U band at the Terskol Peak Observatory on February 9, 2008. During the formation of the flare over the course of 30 seconds, the flare-induced stellar luminosity increased and became more than 180 times the preflare value. The total duration of the flare was approximately one hour. At the flare maximum, quasi-periodic pulsations having a specified period of approximately 11 s, an initial modulation depth of 5.5%, and an exponential damping time of 29 s were discovered using wavelet analysis. Assuming that the pulsations were caused by fast magnetohydrodynamic oscillations of a flare loop, the following parameters were determined in the region of energy release using coronal seismology methods: plasma concentration (2 × 1010 cm−3), temperature (3 × 107 K), and magnetic field strength (0.015 T). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink