Intermittency in the Photosphere and Corona above an Active Region
- 10 July 2008
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 681 (2), 1669-1676
- https://doi.org/10.1086/588426
Abstract
Recent studies undoubtedly demonstrate that the magnetic field in the photosphere and corona is an intermittent structure, which offers new views on the underlying physics. In particular, such problems as the existence in the corona of localized areas with extremely strong resistivity (required to explain magnetic reconnection of all scales) and the interchange between small and large scales (required in study of the photosphere/corona coupling), to name a few, can be easily captured by the concept of intermittency. This study is focused on simultaneous time variations of intermittency properties derived in the photosphere, chromosphere and corona. We analyzed data for NOAA AR 10930 acquired between Dec 08, 2006 12:00 UT and Dec 13, 2006 18:45 UT. Photospheric intermittency was inferred from Hinode magnetic field measurements, while intermittency in the transition region and corona was derived from Nobeyama 9 GHz radio polarization measurements, high cadence Hinode/XRT/Be-thin data as well as GOES 1-8\AA flux. Photospheric dynamics and its possible relationship with the intermittency variations were also analyzed by calculating the kinetic vorticity. For this case study we found the following chain of events. Intermittency of the photospheric magnetic field peaked after the specific kinetic vorticity of plasma flows in the AR reached its maximum level (4 hour time delay). In turn, gradual increase of coronal intermittency occurred after the peak of the photospheric intermittency. The time delay between the peak of photospheric intermittency and the occurrence of the first strong (X3.4) flare was approximately 1.3 days. Our analysis seems to suggest that the enhancement of intermittency/complexity first occurs in the photosphere and is later transported toward the coronaKeywords
This publication has 34 references indexed in Scilit:
- Statistical Correlations between Parameters of Photospheric Magnetic Fields and Coronal Soft X‐Ray BrightnessThe Astrophysical Journal, 2007
- Coexistence of Self-Organized Criticality and Intermittent Turbulence in the Solar CoronaPhysical Review Letters, 2007
- Coronal Heating and Photospheric Turbulence Parameters: Observational AspectsThe Astrophysical Journal, 2006
- The Statistical Relationship between the Photospheric Magnetic Parameters and the Flare Productivity of Active RegionsThe Astrophysical Journal, 2006
- A statistical study of SUMER spectral images: events, turbulence, and intermittencyAstronomy & Astrophysics, 2006
- The Heating of Cool‐Star Coronae: From Individual Loops to Global Flux‐Flux ScalingsThe Astrophysical Journal, 2005
- The Coronal Heating Mechanism as Identified by Full‐Sun VisualizationsThe Astrophysical Journal, 2004
- A measure from line‐of‐sight magnetograms for prediction of coronal mass ejectionsJournal of Geophysical Research, 2003
- On the inclination of photospheric solar magnetic fieldsThe Astrophysical Journal, 1992
- Avalanches and the distribution of solar flaresThe Astrophysical Journal, 1991