Connection Between Chromospheric Events and Photospheric Dynamics
- 449 Downloads
We analyzed chromospheric events and their connection to oscillation phenomena and photospheric dynamics. The observations were done with the New Solar Telescope of Big Bear Solar Observatory using a broad-band imager at the wavelength of a TiO band and FISS spectrograph scanning Ca ii and Hα spectral lines. The event in Ca ii showed strong plasma flows and propagating waves in the chromosphere. The movement of the footpoints of flux tubes in the photosphere indicated flux tube entanglement and magnetic reconnection as a possible cause of the observed brightening and waves propagating in the chromosphere. An upward propagating train of waves was observed at the site of the downflow event in Hα. There was no clear relationship between photospheric waves and the Ca ii and Hα events. Our observations indicate that chromospheric waves that were previously thought to originate from the photosphere may be generated by some events in the chromosphere as well.
The authors are thankful to the anonymous referee for helpful comments. AA is thankful to J. Varsik and R. Fear for the help with the observations. K. Ahn and W. Cao acknowledge the support of the US NSF AGS-0847126. The work of J. Chae, H. Park, and H. Yang was supported by the National Research Foundation of Korea (KRF-2008-220-C00022), and that of Y.D. Park, by the Development of Korean Space Weather Center, a project of KASI.
- Janssen, K.: 2003, Struktur und Dynamik kleinskaliger Magnetfelder der Sonnenatmosphaere, Copernikus GmbH, Kaltenburg-Lindau, 123. Google Scholar
- Kalkofen, W.: 1999, In: Schmieder, B., Hofmann, A., Staude, J. (eds.) Third Advances in Solar Physics Euroconference: Magnetic Fields and Oscillations, ASP Conf. Ser. 184, 227. Google Scholar
- von der Lühe, O.: 1993, Astron. Astrophys. 268, 347. Google Scholar