Results 61 to 70 of about 41,536 (207)

Power-law Indices of EUV Intensity Power Spectrum in Flaring Coronal Active Regions

The Astrophysical Journal
Solar intensity power spectra are usually characterized by colored noise, with the spectral energy following a segmented power-law function of frequency, S ( f ) ∝ f ^− ^α , over different frequency ranges. Typically, the power-law index exceeds 1 in the
Sihui Zhong, Dmitrii Y. Kolotkov, Valery M. Nakariakov   +2 more
doaj   +1 more source

Spectral analysis of 3D MHD models of coronal structures

, 2009
We study extreme-ultraviolet emission line spectra derived from three-dimensional magnetohydrodynamic models of structures in the corona. In order to investigate the effects of increased magnetic activity at photospheric levels in a numerical experiment,
Barnes, Brandenburg, Brkovic, Culhane, Dere, Donati, Grevesse, Gudiksen, Gudiksen, Gudiksen, Hardi Peter, Harrison, Landi, Mazzotta, Parker, Peter, Peter, Peter, Pia Zacharias, Redfield, Scherrer, Sim, Sven Bingert, Teriaca, Wilhelm, Wood   +25 more
core   +1 more source

HELIOS: A Visualization Tool to Decipher the Locations and Dynamical Properties of Expanding Small Magnetic Flux Ropes in the Corona

The Astrophysical Journal Supplement Series
On 2024 December 24, Parker Solar Probe made its closest approach to the Sun, reaching a 9.86 R _⊙ heliocentric distance and capturing high-resolution observations of the solar corona.
Evangelos Paouris, Angelos Vourlidas, Guillermo Stenborg   +2 more
doaj   +1 more source

A Parametric Study of Solar Wind Properties and Composition Using Fluid and Kinetic Solar Wind Models

The Astrophysical Journal
The physical processes in the solar corona that shape the solar wind remain an active research topic. Modeling efforts have shown that energy and plasma exchanges near the transition region play a crucial role in modulating solar wind properties ...
Paul Lomazzi, Alexis P. Rouillard, Michael A. Lavarra, Nicolas Poirier, Pierre-Louis Blelly, Jean-Baptiste Dakeyo, Viviane Pierrard, Victor Réville, Christian Vocks, Simon Thomas   +9 more
doaj   +1 more source

Localized Heating and Dynamics of the Solar Corona due to a Symbiosis of Waves and Reconnection

The Astrophysical Journal
The Sun’s outer atmosphere, the corona, is maintained at mega-Kelvin temperatures and fills the heliosphere with a supersonic outflowing wind. The dissipation of magnetic waves and direct electric currents are likely to be the most significant processes ...
A. K. Srivastava, Sripan Mondal, Eric R. Priest, Sudheer K. Mishra, David I. Pontin, R.Y. Kwon, Ding Yuan, K. Murawski, Ayumi Asai   +8 more
doaj   +1 more source

Observational Test of Coronal Magnetic Field Models I. Comparison with Potential Field Model

, 2008
Recent advances have made it possible to obtain two-dimensional line-of-sight magnetic field maps of the solar corona from spectropolarimetric observations of the Fe XIII 1075 nm forbidden coronal emission line.
Arnaud J., Haosheng Lin, Liu Y., Yu Liu
core   +1 more source

Magnetic Field Variability as a Consistent Predictor of Solar Flares

The Astrophysical Journal
Solar flares are intense bursts of electromagnetic radiation that occur due to a rapid destabilization and reconnection of the magnetic field. While preflare signatures and trends have been investigated from magnetic observations prior to flares for ...
K. L. Kniezewski, E. I. Mason, D. J. Emmons, K. E. Fitch, S. H. Garland   +4 more
doaj   +1 more source

Analysis of CME Interactions in Solar Corona Combining Coronagraphic Observations with Wide-field Imagers from Solar Orbiter and Parker Solar Probe

The Astrophysical Journal
Accurately determining the trajectory of coronal mass ejections (CMEs) is vital for space weather forecasting and assessing their potential impact on Earth. CMEs often deviate from a radial path, due to local pressure gradients or interactions with other
Alessandro Liberatore, Paulett C. Liewer, Manuela Temmer, Greta M. Cappello, Yara De Leo, Paulo Penteado   +5 more
doaj   +1 more source

Solar origins of solar wind properties during the cycle 23 solar minimum and rising phase of cycle 24

Journal of Advanced Research, 2013
The solar wind was originally envisioned using a simple dipolar corona/polar coronal hole sources picture, but modern observations and models, together with the recent unusual solar cycle minimum, have demonstrated the limitations of this picture.
Janet G. Luhmann, Gordon Petrie, Pete Riley   +2 more
doaj   +1 more source

Multiscale statistical analysis of coronal solar activity

, 2016
Multi-filter images from the solar corona are used to obtain temperature maps which are analyzed using techniques based on proper orthogonal decomposition (POD) in order to extract dynamical and structural information at various scales.
del-Castillo-Negrete, Diego, Gamborino, Diana, Martinell, Julio J.   +2 more
core   +2 more sources