Bibcode
Fischer, C. E.; Bello González, N.; Rezaei, R.
Referencia bibliográfica
Coimbra Solar Physics Meeting: Ground-based Solar Observations in the Space Instrumentation Era Proceedings of a Meeting held at the University of Coimbra, Coimbra, Portugal In 5-9 October 2015. Edited by Ivan Dorotovic, Catherine E. Fischer, and Manuela Temmer. ASP Conference Series, Vol. 504. San Francisco: Astronomical Society of the Pacific, 2016, p.19
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4
2016
Número de citas
2
Número de citas referidas
2
Descripción
We study two physical processes that can be commonly observed in the
quiet sun and involve temporal evolution of the magnetic field:
convective collapse and flux cancellation. The aim is to investigate the
response of the chromosphere to the magnetic events in the photosphere
below. We have calibrated and aligned a co-spatial and co-temporal 3
hour quiet sun time series observed with the Hinode SOT (Solar Optical
Telescope) and the IRIS (Interface Region Imaging Spectrograph)
satellites. Convective collapse events are identified in the
photosphere by inverting spectropolarimetric data and searching for
magnetic field intensification, preceded by a downflow and accompanied
by the development of a bright point in Ca II H images. We find a
corresponding downflow in the low chromosphere as deduced from IRIS Mg
II k and h spectra and an ensuing oscillatory velocity pattern. We use
magnetograms in the high photosphere to study pairs of magnetic elements
involved in flux cancellation and find an increase in the entire
quasi-continuum of the IRIS Mg II k and h spectrum following the flux
cancellation process and indicating a substantial energy deposit into
the lower atmosphere.