Results 31 to 40 of about 19,921 (169)
Shaping the diffuse X-ray sky: Structure, Variability and Visibility
The Open Journal of AstrophysicsThe Local Bubble (LB) is a hot, low-density cavity in the solar neighborhood, inside which the Solar System is currently located. The X-ray emission from such bubbles is strongly governed by the gas density, temperature, and the effects of line-of-sight ...
Philipp Girichidis +7 more
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Transport of Cosmic-Ray Electrons from 1 au to the Sun
The Astrophysical Journal, 2023 Gamma rays are produced by cosmic-ray (CR) protons interacting with the particles at the solar photosphere and by CR electrons and positrons (CRes) via inverse Compton scattering of solar photons.
Vahé Petrosian +2 more
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Landscape of Coronal X-Ray Variability and Cycles
The Astronomical JournalCoronal (1–10 MK) X-rays display dramatic variability over the Sun’s iconic 11 yr magnetic dynamo cycle: already a factor of 4 in the soft 0.1–2.4 keV “ROSAT band,” soaring to more than 100 at harder energies (>10 keV).
Thomas Ayres
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Investigating a Characteristic Time Lag in the Ionospheric F-Region’s Response to Solar Flares
AtmosphereX-ray and EUV solar flare emission cause increases in the Earth’s dayside ionospheric electron density. While the response of the lower ionosphere to X-rays is well studied, the delay between EUV flare emission and the response of the ionospheric F ...
Aisling N. O’Hare +3 more
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Quasi-Periodic Pulsations in an M-Class Solar Flare
Universe, 2023 We have studied the quasi-periodic pulsations (QPPs) of the M2.3 flare that occurred in the active region NOAA 12172 on 23 September 2014. Through the fast Fourier transform (FFT) method, we decompose the flare light curves into fast- and slowly-varying ...
Jun Xu +3 more
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Electrons and X-Ray Emission of Solar Flares [PDF]
Symposium - International Astronomical Union, 1990 A statistical analysis of solar flare X-rays and interplanetary particle fluxes, measured onboard VENERA-13, 14 Spacecraft, was performed. The correlation of fluences for different manifestations of solar flares is strong, especially for fast electrons and hard and soft X-ray emissions. Frequency dependence on fluence value ϵi for practically all Kinds
openaire +1 more source
Cosmic Rays Masquerading as Cool Cores: An Inverse-Compton Origin for Cool Core Cluster Emission
The Open Journal of AstrophysicsX-ray bright cool-core (CC) clusters contain luminous radio sources accelerating cosmic ray (CR) leptons at prodigious rates. Near the acceleration region, high-energy leptons produce synchrotron (mini)halos and sometimes observable gamma rays, but these
Philip F. Hopkins +5 more
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Estimation of the impact of solar flare spectra on the Earth’s ionosphere using the GAIA model
Journal of Space Weather and Space ClimateThe rapid increase in X-ray and extreme ultraviolet (EUV) emissions owing to solar flares enhances ionization in the ionosphere, increasing radio wave attenuation.
Kitajima Shinnosuke +4 more
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Solar Wind Charge-Exchange X-ray Emissions from the O5+ Ions in the Earth’s Magnetosheath
Remote SensingThe spectra and global distributions of the X-ray emissions generated by the solar wind charge-exchange (SWCX) process in the terrestrial magnetosheath are investigated based on a global hybrid model and a global geocoronal hydrogen model. Solar wind O6+
Zhicheng Zhang +5 more
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The Astrophysical Journal Supplement Series, 2023 The CHIANTI atomic database provides sets of assessed data that are used for simulating spectral observations of astrophysical plasmas. This article describes updates that will be released as version 10.1 of the database.
Kenneth P. Dere +3 more
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