Results 21 to 30 of about 2,412 (205)
Proxy-based Prediction of Solar Extreme Ultraviolet Emission Using Deep Learning [PDF]
The Astrophysical Journal Letters, 2021 Abstract High-energy radiation from the Sun governs the behavior of Earth’s upper atmosphere and such radiation from any planet-hosting star can drive the long-term evolution of a planetary atmosphere. However, much of this radiation is unobservable because of absorption by Earth’s atmosphere and the interstellar medium.
Anthony Pineci +3 more
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Validation of Computed Extreme Ultraviolet Emission Spectra During Solar Flares [PDF]
Earth, Planets and Space, 2020 Abstract 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. To predict the effects of flare emissions on the Earth’s upper atmosphere, numerous empirical and physical models ...
Shohei Nishimoto +4 more
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Explosive events in the solar atmosphere seen in extreme-ultraviolet emission lines [PDF]
Astronomy & Astrophysics, 2005 We present observations of explosive events (EEs) in the solar atmosphere obtained with the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer on the Solar and Heliospheric Observatory (SOHO) in the wavelength range from about 750 A to 790 A.
Mendoza-Torres, J. +2 more
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Emission lines of H2 in the extreme-ultraviolet solar spectrum
The Astrophysical Journal, 1978 A sunspot EUV spectrum covering the wavelength range from 1175 to 1714 A with high spatial and spectral resolution is examined which contains about 200 lines not previously reported in solar spectra. Many of the lines are identified as transitions in the Lyman bands of H2.
Jordan, C +4 more
openaire +2 more sources
Extreme-Ultraviolet Emission from Solar Prominences
The Astrophysical Journal, 1972 Spectra and spectroheliograms of prominences have been obtained at wavelengths of 300 to 1400 A from instruments aboard the OSO 4 and OSO 6 spacecraft. Quiescent prominences appear in emission above the limb for all strong lines formed at temperatures below 300,000 K, but not at higher temperatures.
R. W. Noyes +5 more
openaire +1 more source
Extreme-ultraviolet and X-Ray Emission of Turbulent Solar Flare Loops [PDF]
The Astrophysical Journal Letters, 2019 Abstract Turbulence has been observed in flare loops and is believed to be crucial for the acceleration of particles and in the emission of X-ray photons in flares, but how the turbulence is produced is still an open question. A scenario proposed by Fang et al.
Ruan, Wenzhi, Xia, Chun, Keppens, Rony
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Measurements of extreme-ultraviolet emission-line profiles near the solar limb
The Astrophysical Journal, 1978 Line profiles of optically thin extreme-ultraviolet emission lines observed in a quiet sun region at positions within and above the white-light limb with the NRL slit spectrograph (S082-B) on Skylab are discussed. Absolute line intensities and full widths at half-maximum are presented for lines formed over the temperature range from about 10,000 to 22 ...
J. T. Mariska, U. Feldman, G. A. Doschek
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3D Printing Innovations in Polymeric Porous and Patterned Architecture
Advanced Functional Materials, EarlyView.Polymeric foams occupy a unique structural space between dense solids and open networks, where engineered void fraction governs mechanical compliance, thermal resistance, and mass transport. Additive manufacturing now enables precise spatial control over cellular architecture, unlocking designer foam structures across applications spanning crash ...
Dhanush Patil +13 more
wiley +1 more source
Extreme ultraviolet emission lines of Ar XIV in solar active region and flare spectra [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 New R-matrix calculations of electron impact excitation rates for transitions among the 2s 2 2p, 2s2p 2 and 2p 3 levels of Ar XIV are presented. These data are subsequently used to derive the theoretical electron density diagnostic emission-line intensity ratios R 1 = I(187.95 A)/I(194.41 A) and R 2 = I(257.40 A)/I(243.78 A) for a range of ...
Keenan, Francis +5 more
openaire +2 more sources
Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics
Advanced Materials, EarlyView.The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades +7 more
wiley +1 more source