An inversion software for the analysis of solar X-ray spectra within the NASA RHESSI Mission

Relatore
Anna Maria Massone - CNR - INFM, LAMIA, Genova
Data e ora
martedì 7 marzo 2006 alle ore 17.30 - caffè, tè & C. ore 17.00
Luogo
Ca' Vignal - Piramide, Piano 0, Sala Verde
Referente
Referente esterno
Data pubblicazione
1 marzo 2006
Dipartimento
 

Riassunto

NASA has recently launched the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) mission with the purpose of analysing solar flares, by combining 2D imaging with the spectral information given by high-resolution detectors. From a physical viewpoint, the dominant X-ray emission mechanism during solar flares is collisional bremsstrahlung of electrons with the ions of the solar plasma. From a mathematical viewpoint, the relation between the emitted photon spectrum and the electron flux spectrum is described by a Volterra integral equation whose kernel is an appropriate bremsstrahlung cross section. If addressed naively, the solution of this equation may lead to unstable and unphysical reconstructions of the electron spectra. In this talk we will show inversions of real RHESSI spectra by applying regularization techniques for the solution of numerically unstable inverse problems. Both the case of an isotropic cross section and the effects of angle dependency will be investigated. Finally a software tool implementing the regularization method will be described.





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