Chromospheric Counterparts of UV Explosive Events

Details Chromospheric Counterparts of UV Explosive Events Chromospheric Counterparts of UV Explosive Events

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.2.17r&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

We present a study of a unique, multi-wavelength dataset of a quiet sun region with the primary goal of studying explosive events at chromospheric and transition region heights. Several hypotheses have been made about the nature of the explosive events, however the underlying mechanisms remain elusive due to their small spatial and temporal scales. Several theoretical models predict an important role for the chromosphere in the triggering of these events.
To shed light on this issue, we have obtained a comprehensive set of simultaneous high spatial, spectral, and temporal resolution observations on April 18, 2007, combining both ground- and space-based observatories. Most importantly, we carried out coordinated observations with SUMER in the transition region Si IV 140.2 nm line together with high-cadence IBIS imaging spectroscopy of the chromospheric CaII 854.2 nm line. This allows us to examine the chromospheric dynamics and acoustic shocks that underlie the transition region events. We also use SOT/NFI magnetograms to examine the relation of the explosive events to the changes in the magnetic topology. The combined dataset also includes Hinode/EIS rasters and Hinode/XRT images that provide information on the higher-temperature coronal response.

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