Results 71 to 80 of about 1,129,035 (260)

Solar flares: The impulsive phase [PDF]

Solar Physics, 1989
AbstractOnly during the previous solar cycle have systematic observations begun to be made with the sensitivity and time resolution, and the continuous coverage required to catch the impulsive phase and measure the rapid variations present in many wavelength ranges.
Brian R. Dennis, Richard A. Schwartz
openaire   +2 more sources

Clean development mechanisms in Latin America: Efficiency analysis of energy‐generating projects

Environmental Progress &Sustainable Energy, EarlyView.
Abstract This research addresses two key questions related to Clean Development Mechanism (CDM) This research aimed to address two research questions related to CDM projects focused on energy generation in Latin America. The first question aimed to identify the most efficient projects carried out in this region, while the second question sought to ...
Antonio Carlos Pacagnella Junior, Gustavo Hermínio Salati Marcondes de Moraes, Adauto Lucas da Silva, Fernando Ferrari Putti, Wagner Wilson Bortoletto   +4 more
wiley   +1 more source

Temporal Variation of Flare Occurrence Rates via the Spot Evolution on the Sun and Solar-type Stars

The Astrophysical Journal
The spot evolution on the Sun and solar-type stars is important for understanding the nature of consequential flaring activity. This study statistically investigates the variance of flare occurrence rate through the time evolution of spots on the Sun and
Takato Tokuno, Kosuke Namekata, Hiroyuki Maehara, Shin Toriumi   +3 more
doaj   +1 more source

The NWRA Classification Infrastructure: description and extension to the Discriminant Analysis Flare Forecasting System (DAFFS)

Journal of Space Weather and Space Climate, 2018
A classification infrastructure built upon Discriminant Analysis (DA) has been developed at NorthWest Research Associates for examining the statistical differences between samples of two known populations.
Leka K.D., Barnes Graham, Wagner Eric
doaj   +1 more source

Microwave imaging of quasi-periodic pulsations at flare current sheet

Nature Communications, 2022
Quasi-periodic pulsations (QPPs) are frequently detected in solar and stellar flares, but the underlying physical mechanisms are still to be ascertained.
Yuankun Kou, Xin Cheng, Yulei Wang, Sijie Yu, Bin Chen, Eduard P. Kontar, Mingde Ding   +6 more
doaj   +1 more source

Solar Flare Prediction with the Hybrid Deep Convolutional Neural Network

Astrophysical Journal, 2019
We propose a hybrid Convolutional Neural Network (CNN) model (Model 2) and modify a popular CNN model (Model 1) to predict multiclass solar flare occurrence within 24 hr.
Yanfang Zheng, Xuebao Li, Xinshuo Wang
semanticscholar   +1 more source

Retrofitting Low Carbon Aviation Fuels Processes From Natural Gas to Renewables Energy‐Based Systems

Greenhouse Gases: Science and Technology, EarlyView.
ABSTRACT The aviation sector's dependence on high‐energy‐density fuels presents a challenge for decarbonization. This study evaluates the economic and environmental feasibility of retrofitting a gas‐to‐liquid (GTL) plant for low carbon aviation fuel (LCAF) production using solar electrification, an advanced reformer unit (CARGEN), and a hybrid ...
Yasmin Abdelkarim, Tagwa Musa, Mohamed S. Challiwala, Tala Katbeh, Hanif Choudhury, Mahmoud El‐Halwagi, Nimir O. Elbashir   +6 more
wiley   +1 more source

Quasi-periodic Pulsations in the Most Powerful Solar Flare of Cycle 24 [PDF]

, 2018
Quasi-periodic pulsations (QPPs) are common in solar flares and are now regularly observed in stellar flares. We present the detection of two different types of QPP signals in the thermal emission light curves of the X9.3-class solar flare SOL2017-09 ...
D. Kolotkov, C. Pugh, A. Broomhall, V. Nakariakov   +3 more
semanticscholar   +1 more source

IMPULSIVITY PARAMETER FOR SOLAR FLARES [PDF]

The Astrophysical Journal, 2016
ABSTRACT Three phases are typically observed during solar flares: the preflare, impulsive, and decay phases. During the impulsive phase, it is believed that the electrons and other particles are accelerated after the stored energy in the magnetic field is released by reconnection.
Julián D. Alvarado-Gómez, Julián D. Alvarado-Gómez, Julián D. Alvarado-Gómez, W. G. Fajardo-Mendieta, B. Calvo-Mozo, J. C. Martínez-Oliveros   +5 more
openaire   +3 more sources

Climate and political effects on agriculture: Empirical evidence from SSA

International Studies of Economics, EarlyView.
Abstract The most of Sub‐Saharan African (SSA) countries have been affected by climate change and food insecurity problems due to the reduction of production and productivity of cereal crops in the continent. The purpose of this research was to examine the short‐run and long‐run effects of climate change on agricultural productivity in 24 selected SSA ...
Defaru Adugna Feye, Amsalu Bedemo Beyene, Suchitra Krishna Kumar   +2 more
wiley   +1 more source