Results 21 to 30 of about 1,347 (224)

The Solar Minimum Eclipse of 2019 July 2. III. Inferring the Coronal T e with a Radiative Differential Emission Measure Inversion

The Astrophysical Journal, 2023
Differential emission measure (DEM) inversion methods use the brightness of a set of emission lines to infer the line-of-sight (LOS) distribution of the electron temperature ( T _e ) in the corona.
Benjamin Boe, Cooper Downs, Shadia Habbal   +2 more
doaj   +1 more source

Three-dimensional inversion of corona structure and simulation of solar wind parameters based on the photospheric magnetic field deduced from the Global Oscillation Network Group

Frontiers in Astronomy and Space Sciences, 2023
In this research, the Potential Field Source Surface–Wang–Sheeley–Arge (PFSS–WSA) solar wind model is used. This model consists of the Potential Field Source Surface (PFSS) coronal magnetic field extrapolation module and the Wang–Sheeley–Arge (WSA) solar
Xiao Zhang, Shican Qiu, Willie Soon, Willie Soon, Hamad Yousof   +4 more
doaj   +1 more source

Are Quasi-periodic Pulsations Independent of Loop Oscillations in Solar Flare?

The Astrophysical Journal, 2023
We investigated oscillations in an M8.7 solar flare (SOL2014-10-22), including quasi-periodic pulsations (QPPs) in light curves and Doppler shift oscillations in the flare loops.
Fanpeng Shi, Dong Li, Zongjun Ning, Yangfan Guo, Song Feng, Jun Xu   +5 more
doaj   +1 more source

DIRECT OBSERVATION OF SOLAR CORONAL MAGNETIC FIELDS BY VECTOR TOMOGRAPHY OF THE CORONAL EMISSION LINE POLARIZATIONS [PDF]

The Astrophysical Journal Letters, 2016
ABSTRACT We present the first direct “observation” of the global-scale, 3D coronal magnetic fields of Carrington Rotation (CR) Cycle 2112 using vector tomographic inversion techniques. The vector tomographic inversion uses measurements of the Fe xiii 10747 Å Hanle effect polarization signals by the Coronal Multichannel Polarimeter (CoMP)
Kramar, M., Lin, H., Tomczyk, S.
openaire   +2 more sources

Coronal line intensity as an integrated index of solar activity

Astrophysics and Space Science, 1990
The relation between coronal green line intensity and high-speed streams of solar wind emitted by coronal holes or by loop structures of the corona is studied. As well as these exclusive regions of coronal radiative emission, other factors of solar activity have been taken into account in this relation, such as proton events, sunspot number, faculae ...
Xanthakis, J., Petropoulos, B., Mavromichalaki, H.   +2 more
openaire   +2 more sources

Investigating the Origin of the First Ionization Potential Effect With a Shell Turbulence Model

Frontiers in Astronomy and Space Sciences, 2021
The enrichment of coronal loops and the slow solar wind with elements that have low First Ionization Potential, known as the FIP effect, has often been interpreted as the tracer of a common origin.
Victor Réville, Alexis P. Rouillard, Marco Velli, Andrea Verdini, Éric Buchlin, Michael Lavarra, Nicolas Poirier   +6 more
doaj   +1 more source

Anomalous-plasmoid-ejection-induced secondary magnetic reconnection: modeling solar flares and coronal mass ejections by laser–plasma experiments

High Power Laser Science and Engineering, 2013
The driving mechanism of solar flares and coronal mass ejections is a topic of ongoing debate, apart from the consensus that magnetic reconnection plays a key role during the impulsive process.
Quanli Dong, Dawei Yuan, Shoujun Wang, Xun Liu, Yutong Li, Xiaoxuan Lin, Huigang Wei, Jiayong Zhong, Shaoen Jiang, Yongkun Ding, Bobin Jiang, Kai Du, Yongjian Tang, Mingyang Yu, Xiantu He, Neng Hua, Zhanfeng Qiao, Kuixi Huang, Ming Chen, Jianqiang Zhu, Gang Zhao, Zhengming Sheng, Jie Zhang   +22 more
doaj   +1 more source

Neutral‐Line Magnetic Shear and Enhanced Coronal Heating in Solar Active Regions [PDF]

The Astrophysical Journal, 1997
By examining the magnetic structure at sites in the bright coronal interiors of active regions that are not flaring but exhibit persistent strong coronal heating, we establish some new characteristics of the magnetic origins of this heating. We have examined the magnetic structure of these sites in five active regions, each of which was well observed ...
D. A. Falconer, R. L. Moore, J. G. Porter, G. A. Gary, T. Shimizu   +4 more
openaire   +1 more source

Radiation‐Resistant Aluminum Alloy for Space Missions in the Extreme Environment of the Solar System

Advanced Materials, EarlyView.
A novel ultrafine‐grained aluminum crossover alloy exhibits unprecedented radiation resistance and mechanical stability under extreme irradiation doses up to 100 dpa. The exceptional resilience arises from thermodynamically stable T‐phase precipitates, enabling lightweight structural materials for next‐generation spacecraft and extraterrestrial ...
Patrick D. Willenshofer, Matheus A. Tunes, Hi T. Vo, Lukas Stemper, Markus Alfreider, Oliver Renk, Graeme Greaves, Daniel Kiener, Peter J. Uggowitzer, Stefan Pogatscher   +9 more
wiley   +1 more source

Coronal Magnetometry with EUV Permitted Lines

The Astrophysical Journal
A major challenge in solar physics is to obtain empirical information on the magnetic field of the million-degree plasma of the solar corona. To this end, we need observables of the solar radiation sensitive to the coronal magnetic field.
Nataliia G. Shchukina, Javier Trujillo Bueno, Supriya Hebbur Dayananda, Rafael Manso Sainz, Andrii V. Sukhorukov   +4 more
doaj   +1 more source