X-RAY-SPECTRA OF SOLAR-FLARES OBTAINED WITH A HIGH-RESOLUTION BENT CRYSTAL SPECTROMETER
| Autor: | Culhane, J, Gabriel, A, Acton, L, Rapley, C, Phillips, K, Wolfson, C, Antonucci, E, Bentley, R, Catura, R, Jordan, C, Kayat, M, Kent, B, Leibacher, J, Parmar, A, Sherman, J, Springer, L, Strong, K, Veck, N |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Solar flare Spectrometer Astrophysics::High Energy Astrophysical Phenomena Astronomy and Astrophysics Astrophysics Charged particle Spectral line law.invention Solar wind Space and Planetary Science law Ionization Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Atomic physics Flare Line (formation) |
| DOI: | 10.1086/183499 |
| Popis: | Preliminary results obtained for three solar flares with the bent crystal spectrometer on the SMM are presented. Resonance and satellite lines of Ca XIX and XVIII and Fe XXV and XXIV are observed together with the Fe XXVI Lyman-alpha line. Plasma properties are deduced from line ratios and evidence is presented for changes of line widths coincident with the occurrence of a hard X-ray impulsive burst. Fe K-alpha spectra from a disk center and a limb flare agree with the predictions of a fluorescence excitation model. However, a transient Fe K-alpha burst observed in a third flare may be explained by the collisional ionization of cool iron by energetic electrons. |
| Databáze: | OpenAIRE |
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