Results 21 to 30 of about 995 (183)

Novel Modelling Approach for Obtaining the Parameters of Low Ionosphere under Extreme Radiation in X-Spectral Range

Applied Sciences, 2021
Strong radiation from solar X-ray flares can produce increased ionization in the terrestrial D-region and change its structure. Moreover, extreme solar radiation in X-spectral range can create sudden ionospheric disturbances and can consequently affect ...
Vladimir A. Srećković, Desanka M. Šulić, Veljko Vujčić, Zoran R. Mijić, Ljubinko M. Ignjatović   +4 more
doaj   +1 more source

Wavelet Analysis of Solar Flare Hard X‐Rays

The Astrophysical Journal, 1998
We apply a multiresolution analysis to hard X-ray (HXR) time profiles f(t) of solar flares. This method is based on a wavelet transform (with triangle-shaped wavelets), which yields a dynamic decomposition of the power at different timescales T, the scalogram P(T, t).
Kliem, Bernhard (Dr.), Schwarz, Udo, Kurths, Jürgen (Prof. Dr.), Dennis, Brian, Schwartz, Richard, Aschwanden, Markus J.   +5 more
openaire   +2 more sources

Cold Solar Flares. I. Microwave Domain

The Astrophysical Journal, 2023
We identify a set of ∼100 “cold” solar flares and perform a statistical analysis of them in the microwave range. Cold flares are characterized by a weak thermal response relative to nonthermal emission.
Alexandra L. Lysenko, Stephen M. White, Dmitry A. Zhdanov, Nataliia S. Meshalkina, Aleksander T. Altyntsev, Galina G. Motorina, Gregory D. Fleishman   +6 more
doaj   +1 more source

Sequential Reduction of Chromite Pellets Using Hydrogen and Silicon Carbide for Carbon Emission Abatement During Ferrochrome Production

steel research international, EarlyView.
H2 prereduction selectively metallizes Fe in UG2 chromite pellets at 1100°C, while silicon carbide becomes active at 1300°C to convert remaining Cr2O3 to carbides and promote Cr metallization. By separating the roles of H2 and SiC, the sequential route reaches up to 65.7% Cr metallization and suppresses in‐furnace CO generation by ≈75% versus ...
D. Coertzen, M. Tangstad, J. P. Beukes, P. G. van Zyl, D. G. Bessarabov, S. P. du Preez   +5 more
wiley   +1 more source

Patterns of X-Ray and γ-Ray Flares: From Blazar to Magnetar and Sun

The Astrophysical Journal
Using Gaussian process methods, we analyzed the light curves of three extreme solar X-ray flares observed by the RHESSI satellite. Their variability characteristics were then compared with those of HXMT-HE X-ray burst (XRB; in SGR 1935+2154) associated ...
Haiyun Zhang, Dahai Yan, Lijuan Dong, Ping Zhang, Ruijing Tang, Jianeng Zhou, Lian Tao, Li Zhang, Niansheng Tang   +8 more
doaj   +1 more source

Probability Distribution Functions of Solar and Stellar Flares

Physics, 2022
The paper studies the soft X-ray data of solar flares and found that the distribution functions of flare fluence are successfully modeled by tapered power law or gamma function distributions whose power exponent is slightly smaller than 2, indicating ...
Takashi Sakurai
doaj   +1 more source

Photochemical effects of Mars‐like UV irradiation on carboxylic acids in carbonaceous chondrites and expectations for abiotic background organics on Mars

Meteoritics &Planetary Science, EarlyView.
Abstract In the search for life on Mars, understanding the origin of preserved organics is critical. Expected sources include exogenous delivery, endogenous synthesis, and potentially life. Environmental processing by ultraviolet (UV) irradiation can alter these organics, obscuring hallmarks of their origin. To deconvolve these effects, we conducted an
D. K. Buckner, J. C. Aponte, A. C. Schuerger, D. I. Foustoukos, F. Seguin, M. B. Wilhelm, G. Cooper, A. J. Williams   +7 more
wiley   +1 more source

Analysis of the Consecutive X‐Ray Flares Effects on the Lower Ionosphere

Space Weather
X‐ray is a critical factor in generating electrons in the lower ionosphere, however, the cumulative effects of consecutive X‐ray flares on the lower ionosphere remain understudied due to the scarcity of historical events.
Shuai Wang, Yuan Gang, Lin Quan, Dianwei Cong, Kunpeng Wang, Shuting Yang   +5 more
doaj   +1 more source

Unmanned Aerial Systems for Corrosion Detection: Multi‐Sensor Technologies, Challenges, and Opportunities for Next‐Generation Inspection

Quality and Reliability Engineering International, Volume 42, Issue 6, Page 3565-3583, October 2026.
ABSTRACT Corrosion remains a critical threat to the integrity and service life of infrastructure in industries such as oil, gas, construction, renewable energy, and transportation. Traditional inspection methods, being labor‐intensive, hazardous, and often subjective, fall short in addressing modern inspection demands.
Alhossein Alharbi, Yunes Alqudsi, Alhasan Ali Alharbi, Mohammed Basheer Mohiuddin   +3 more
wiley   +1 more source

X‐Ray Observations of Solar Long‐Duration Flares

The Astrophysical Journal, 2005
Yohkoh X-ray observations during the several-hour decay of six large solar flares show that the main emitting region is in the form of a bright loop-top source whose spatial extent well after the impulsive stage explains most of the broadening of S XV and Ca XIX X-ray lines, which would otherwise imply nonthermal velocities of 100 km s-1 or more ...
Kjh Phillips, Kjh Phillips, U. Feldman, Louise K. Harra   +3 more
openaire   +2 more sources