New Observations of Balmer Continuum Flux in Solar Flares Instrument Description and First Results

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F16%3A00462089" target="_blank" >RIV/67985815:_____/16:00462089 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s11207-016-0860-y" target="_blank" >http://dx.doi.org/10.1007/s11207-016-0860-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11207-016-0860-y" target="_blank" >10.1007/s11207-016-0860-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

New Observations of Balmer Continuum Flux in Solar Flares Instrument Description and First Results

Popis výsledku v původním jazyce

Here we describe a new post-focal instrument, the image selector, with which the Balmer continuum flux can be measured from the whole flare area, in analogy to successful detections of flaring dMe stars. The system was developed and put into operation at the horizontal solar telescope HSFA2 of the OndA (TM) ejov Observatory. We measure the total flux by a fast spectrometer from a limited but well-defined region on the solar disk. Using a system of diaphragms, the disturbing contribution of a bright solar disk can be eliminated as much as possible. Light curves of the measured flux in the spectral range 350 -aEuro parts per thousand 440 nm are processed, together with the images of the flaring area delimited by the appropriate diaphragm. The spectral flux data are flat-fielded, calibrated, and processed to be compared with model predictions. Our analysis of the data proves that the described device is sufficiently sensitive to detect variations in the Balmer continuum during solar flares. Assuming that the Balmer-continuum kernels have at least a similar size as those visible in , we find the flux increase in the Balmer continuum to reach 230 -aEuro parts per thousand 550 % of the quiet continuum during the observed X-class flare. We also found temporal changes in the Balmer continuum flux starting well before the onset of the flare in .

Název v anglickém jazyce

New Observations of Balmer Continuum Flux in Solar Flares Instrument Description and First Results

Popis výsledku anglicky

Here we describe a new post-focal instrument, the image selector, with which the Balmer continuum flux can be measured from the whole flare area, in analogy to successful detections of flaring dMe stars. The system was developed and put into operation at the horizontal solar telescope HSFA2 of the OndA (TM) ejov Observatory. We measure the total flux by a fast spectrometer from a limited but well-defined region on the solar disk. Using a system of diaphragms, the disturbing contribution of a bright solar disk can be eliminated as much as possible. Light curves of the measured flux in the spectral range 350 -aEuro parts per thousand 440 nm are processed, together with the images of the flaring area delimited by the appropriate diaphragm. The spectral flux data are flat-fielded, calibrated, and processed to be compared with model predictions. Our analysis of the data proves that the described device is sufficiently sensitive to detect variations in the Balmer continuum during solar flares. Assuming that the Balmer-continuum kernels have at least a similar size as those visible in , we find the flux increase in the Balmer continuum to reach 230 -aEuro parts per thousand 550 % of the quiet continuum during the observed X-class flare. We also found temporal changes in the Balmer continuum flux starting well before the onset of the flare in .

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

—

Projekt

<a href="/cs/project/GAP209%2F12%2F1652" target="_blank" >GAP209/12/1652: Analýza netermálních distribucí elektronů ve sluneční koróně a přechodové oblasti</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Solar Physics

ISSN

0038-0938

e-ISSN

—

Svazek periodika

291

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

779-789

Kód UT WoS článku

000373232700004

EID výsledku v databázi Scopus

2-s2.0-84958255959