Results 21 to 30 of about 2,767,562 (223)

A statistical analysis of the location and width of Saturn's southern auroras [PDF]

open access: yes, 2006
A selection of twenty-two Hubble Space Telescope images of Saturn's ultraviolet auroras obtained during 1997–2004 has been analysed to determine the median location and width of the auroral oval, and their variability.
Badman, S. V.   +3 more
core   +6 more sources

Statistical analysis for EUV dynamic spectra and their impact on the ionosphere during solar flares

open access: yesEarth, 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

Sun-as-a-star Spectroscopic Observations of the Line-of-sight Velocity of a Solar Eruption on 2021 October 28

open access: yesThe Astrophysical Journal, 2022
The propagation direction and true velocity of a solar coronal mass ejection, which are among the most decisive factors for its geo-effectiveness, are difficult to determine through single-perspective imaging observations. Here we show that Sun-as-a-star
Yu Xu   +5 more
doaj   +1 more source

Scaling of laser produced plasma UTA emission down to 3 nm for next generation lithography and short wavelength imaging [PDF]

open access: yes, 2011
Presented at a poster session at Advances in X-Ray/EUV Optics and Components VI, Monday 22 August 2011, San Diego, California, USAAn engineering prototype high average power 13.5-nm source has been shipped to semiconductor facilities to permit the ...
Deirdre Kilbane   +25 more
core   +1 more source

Reconstructing the XUV Spectra of Active Sun-like Stars Using Solar Scaling Relations with Magnetic Flux

open access: yesThe Astrophysical Journal, 2023
The Kepler space telescope and Transiting Exoplanet Survey Satellite unveiled that Sun-like stars frequently host exoplanets. These exoplanets are subject to fluxes of ionizing radiation in the form of X-ray and extreme-ultraviolet (EUV) radiation that ...
Kosuke Namekata   +5 more
doaj   +1 more source

TWO COMPONENTS OF THE SOLAR CORONAL EMISSION REVEALED BY EXTREME-ULTRAVIOLET SPECTROSCOPIC OBSERVATIONS [PDF]

open access: yesThe Astrophysical Journal, 2011
Recent spectroscopic observations have revealed the ubiquitous presence of blueward asymmetries of emission lines formed in the solar corona and transition region. These asymmetries are most prominent in loop footpoint regions, where a clear correlation of the asymmetry with the Doppler shift and line width determined from the single-Gaussian fit is ...
Hui Tian   +5 more
openaire   +1 more source

Operation of a free-electron laser from the extreme ultraviolet to the water window [PDF]

open access: yes, 2007
We report results on the performance of a free-electron laser operating at a wavelength of 13.7 nm where unprecedented peak and average powers for a coherent extreme-ultraviolet radiation source have been measured.
T. Jezynski   +731 more
core   +2 more sources

Dayside and nightside reconnection rates inferred from IMAGE FUV and Super Dual Auroral Radar Network data [PDF]

open access: yes, 2006
The spectrographic imager at 121.8 nm (SI12) of the far ultraviolet (FUV) experiment onboard the IMAGE spacecraft produces global images of the Doppler-shifted Lyman α emission of the proton aurora. This emission is solely due to proton precipitation and
Hubert, B.   +5 more
core   +6 more sources

Observational signatures of waves and flows in the solar corona [PDF]

open access: yes, 2015
DM acknowledges support of a Royal Society University Research Fellowship and a KU Leuven Research Council senior research fellowship (SF/12/008). The research leading to these results has also received funding from the European Commission Seventh ...
Antolin, Patrick   +3 more
core   +1 more source

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