Multi-wavelength Observations of Dynamic Fibrils in the Upper Photosphere and Chromosphere

Details Multi-wavelength Observations of Dynamic Fibrils in the Upper Photosphere and Chromosphere Multi-wavelength Observations of Dynamic Fibrils in the Upper Photosphere and Chromosphere

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.52k&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

Spatial and temporal evolution of dynamic fibrils (DF) as well as coupling with photospheric features was investigated.
The main target were remnants in the active region 10997 on May 28, 2008. We used about 1 hour series of multi wavelength simultaneous observations of the DFs and corresponding photospheric features. The observations were performed with the german Vacuum Tower Telescope equipped with several post-focus instruments. Namely: TESOS (Triple Etalon SOlar Spectrometer) instrument was used in polarimetric mode (VIP=Visual Imaging Polarimeter) to register 2D spectra of the DFs in H-alpha line and in magnetically sensitive Fe I 630.2 nm line. TIP (Tenerife Infrared Polarimeter) mounted on the Echelle spectrograph was used for spectropolarimetric observations of two neutral iron lines at 1.56 micrometers. We scanned 2D area 80" x 5", producing thus 2D maps of intensity, velocity and magnetic field of the low photosphere under the chromospheric fibril field.
Additionally G-band and H-alpha images were registered with high cadence and the supporting data from the TRACE satellite (17.1 nm, WL, Lyman alpha line and 160 nm continuum) are also available. After careful spatial coalignment of 2D maps we first selected numerous DFs in the H-alpha images. Then we investigated temporal evolution of those DFs concerning changes of their dimensions, positions and fluctuations and correlated these characteristics with temporal evolution of the intensities, velocities and magnetic field characteristics observed in the spatially corresponding photosphere. The poster demonstrates the complex observations, data reduction and coalignment and preliminary results on coupling between DFs and underlying photospheric features.

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