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| Description
| - We investigate the signature of the photospheric albedo contribution in solar flare hard X-ray spectra, the effect of low energy cutoffs in electron spectra, and the directivity of hard X-ray emission. Using Ramaty High Energy Solar Spectroscopic Imager (RHESSI) flare data we perform a statistical analysis of spatially integrated spectra and positions of solar flares. We demonstrate clear centre-to-limb variation of photon spectral indices in the 15-20 keV energy range and a weaker dependency in the 20-50 keV range which is consistent with photospheric albedo as the cause. The results also suggest that low-energy cutoffs sometimes inferred in mean electron spectra are an artefact of albedo. We also derive the anisotropy (ratio of downward/observer directed photons) of hard X-ray emission in the 15-20 keV range for various heliocentric angles.
- We investigate the signature of the photospheric albedo contribution in solar flare hard X-ray spectra, the effect of low energy cutoffs in electron spectra, and the directivity of hard X-ray emission. Using Ramaty High Energy Solar Spectroscopic Imager (RHESSI) flare data we perform a statistical analysis of spatially integrated spectra and positions of solar flares. We demonstrate clear centre-to-limb variation of photon spectral indices in the 15-20 keV energy range and a weaker dependency in the 20-50 keV range which is consistent with photospheric albedo as the cause. The results also suggest that low-energy cutoffs sometimes inferred in mean electron spectra are an artefact of albedo. We also derive the anisotropy (ratio of downward/observer directed photons) of hard X-ray emission in the 15-20 keV range for various heliocentric angles. (en)
- Zkoumáme příspěvek fotosférického albeda v rentgenových spektrech slunečních erupcí, efekt nejnižší energie elektronového spektra a direktivitu rentgenové emise. Užitím dat slunečích erupcí pozorovaných družicí RHESSI provádíme statistickou analýzu prostorově integrovaných spekter a pozic slunečních erupcí. Ukazujeme jasnou variaci fotonových spektrálních indexů v energetickém rozsahu 15-20 keV a slabší variaci v energiích 20-50 keV v závislosti na pozici erupce vzhledem ke středu slunečního disku. Tato variace je konsistentní s vlivem fotosférického albeda. Výsledky také naznačují, že nejnižší energie elektronových spekter, které jsou někdy odvozené pro střední elektonová spektra, jsou artefaktem albeda. Také odvozujeme anisotropii (poměr fotonů šířících se dolů k fotosféře ku fotonům šířících se k pozorovateli) rentgenové emise v energiích 15-20 keV pro několik heliocentrických úhlů. (cs)
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| Title
| - Hard X-ray spectra and positions of solar flares observed by RHESSI: photospheric albedo, directivity and electron spectra
- Rentgenová spektra a pozice erupcí pozorovaných RHESSI: fotosférické albedo, direktivita a elektronová spektra (cs)
- Hard X-ray spectra and positions of solar flares observed by RHESSI: photospheric albedo, directivity and electron spectra (en)
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| skos:prefLabel
| - Hard X-ray spectra and positions of solar flares observed by RHESSI: photospheric albedo, directivity and electron spectra
- Rentgenová spektra a pozice erupcí pozorovaných RHESSI: fotosférické albedo, direktivita a elektronová spektra (cs)
- Hard X-ray spectra and positions of solar flares observed by RHESSI: photospheric albedo, directivity and electron spectra (en)
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| skos:notation
| - RIV/67985815:_____/07:00090663!RIV08-AV0-67985815
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| http://linked.open.../vavai/riv/strany
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
| - P(GA205/04/0358), P(GP205/06/P135), Z(AV0Z10030501)
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/67985815:_____/07:00090663
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - solar flares; particle emission; X-rays (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
| - FR - Francouzská republika
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - Astronomy and Astrophysics
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| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Brown, J. C.
- Kašparová, Jana
- Kontar, E. P.
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| http://linked.open...n/vavai/riv/zamer
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| issn
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| number of pages
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