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Paper: Coronagraphic Broad-Band Hα Observations 1998 2000
Volume: 368, The Physics of Chromospheric Plasmas
Page: 351
Authors: Meunier, N.; Noeens, J-C.; Romeuf, D.; Koutchmy, S.; Jimenez,R.; Wurmser, O.; Rochain, S.
Abstract: Broad-band full-limb Hα images of the inner corona were obtained since the beginning of the solar cycle 23 using one of the Pic-du-Midi coronagraph. We developed a tool to process the complete set of stored images and to automatically extract the properties and evolutions of the observed cold HI coronal structures over a large range of sizes and light fluxes, from small jets and/or spikes to large prominences. The paper describes the recognition techniques implemented in our software and discusses its use. Then we present some new results following a statistical analysis of the occurrence of structure parameters applied to a large sample of observations. It illustrates the capabilities of this software when applied to our database. Strong activity-asymmetries over the solar poles are shown, confirming similar results from elsewhere. We also discuss the distribution of relative light fluxes of these structures over a wide range of sizes. See also http://bass2000.bagn.obs-mip.fr.
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