Results 1 to 10 of about 623 (156)
Validation of computed extreme ultraviolet emission spectra during solar flares [PDF]
Earth, Planets and Space, 2021 X-rays and extreme ultraviolet (EUV) emissions from solar flares rapidly change the physical composition of the Earth’s thermosphere and ionosphere, thereby causing space weather phenomena such as communication failures.
Shohei Nishimoto +4 more
doaj +2 more sources
Element abundances from solar flare spectra [PDF]
Monthly Notices of the Royal Astronomical Society, 1985 Rapport d'abondances de Ar/Ca, K/Ca et Ca/Fe d'apres des spectres RX a haute resolution d'eruptions solaires obtenus par le satellite P78 ...
G. A. Doschek, U. Feldman, J. F. Seely
exaly +2 more sources
The classification of Fe xviii to xxiv emission lines in solar flare spectra [PDF]
Space Science Reviews, 1972 This paper reports recent progress in the classification of the spectra of iron XVIII to XXIV. Emission lines due to these stages of ionisation were reported in the spectra of solar flares by Neupert et al. (1967) who pointed out that the 2s2 2pn–2s2 2pn-1 3d configurations were mainly responsible.
B C Fawcett
exaly +2 more sources
Investigating the Soft X-Ray Spectra of Solar Flare Onsets
The Astrophysical JournalIn this study, we present the analysis of six solar flare events that occurred in 2022, using new data from the third-generation Miniature X-Ray Solar Spectrometer, also known as the Dual-zone Aperture X-ray Solar Spectrometer (DAXSS).
Anant Telikicherla +2 more
doaj +3 more sources
High-resolution solar flare X-ray spectra
Astrophysical Journal, 1979 High spectral resolution solar flare spectra have been recorded by four Bragg crystal spectrometers flown by the Naval Research Laboratory on a spacecraft launched 1979 February 24 by the Air Force. The wavelength ranges discussed in the Letter are 1.82--1.97 A, 2.98--3.07 A, and 3.14--3.24 A.
G A Doschek, R W Kreplin
exaly +2 more sources
Detecting and Classifying Flares in High-resolution Solar Spectra with Supervised Machine Learning
The Astrophysical JournalFlares are a well-studied aspect of the Sun’s magnetic activity. Detecting and classifying solar flares can inform the analysis of contamination caused by stellar flares in exoplanet transmission spectra.
Nicole Hao +2 more
doaj +3 more sources
Analysis of Solar-like X-class Flare on Wolf 359 Observed Simultaneously with TESS and XMM-Newton
The Astrophysical Journal, 2023 We present an analysis of a flare on the Wolf 359 star based on simultaneous observations of Transiting Exoplanet Survey Satellite and XMM-Newton. A stellar flare with energy comparable to an X-class solar flare is analyzed on this star for the first ...
M. Pietras +5 more
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Statistical analysis for EUV dynamic spectra and their impact on the ionosphere during solar flares
Earth, Planets and Space, 2023 The X-rays and extreme ultraviolet (EUV) emitted during solar flares can rapidly change the physical composition of Earth’s ionosphere, causing space weather phenomena.
Shohei Nishimoto +9 more
doaj +1 more source
Temporal variations of the CaXIX spectra in solar flares [PDF]
Astronomy & Astrophysics, 2009 Standard model of solar flares comprises a bulk expansion and rise of abruptly heated plasma (the chromospheric evaporation). Emission from plasma ascending along loops rooted on the visible solar disk should be often dominated, at least temporally, by a blue-shifted emission.
Falewicz, R., Rudawy, P., Siarkowski, M.
openaire +2 more sources
The Transition Region of Solar Flare Loops
The Astrophysical Journal, 2023 The transition region between the Sun’s corona and chromosphere is important to the mass and energy transfer from the lower atmosphere to the corona; consequently, this region has been studied intensely with ultraviolet and extreme ultraviolet (EUV ...
Costis Gontikakis +2 more
doaj +1 more source