Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.448..685c&link_type=abstract
Ninth European Meeting on Solar Physics: Magnetic Fields and Solar Processes. Ninth Meeting of the Solar Physics Section of the
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
Microflares occurring at coronal levels are one of the mechanisms proposed for the heating and dynamics of the chromospheric network. During a SOHO coordinated campaign, we acquired a set of chromospheric and transition region data, at high temporal and spatial resolution, that are suitable for such a research. We describe the characteristics of network points at several heights in the atmosphere. We look for the presence of signatures typical of flares, albeit at much smaller scales. Only one, of the 11 network points analyzed over 1 hr of observations, displays several episodes of red asymmetry in the H_α wings. These asymmetries can be interpreted as downward motions induced by the sudden compression of the lower atmosphere caused by either a particle beam or a conduction front. The analysis hence suggests that microflaring events in network points have a low occurrence probability, or that their energy flux is still below our observational capabilities.
Cauzzi Gianna
Falchi Ambretta
Falciani Roberto
Vial Jean-Claude
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