Results 1 to 10 of about 16,769 (212)

Zone of Preferential Heating for Minor Ions in the Solar Wind

The Astrophysical Journal
The properties of minor ions in the solar wind are important indicators of the state of the solar corona and the heating processes it undergoes as it expands.
Janelle Holmes, Justin Kasper, Kristopher G. Klein, Susan T. Lepri, Jim M. Raines   +4 more
doaj   +1 more source

Steady-state Heating of Diffuse Coronal Plasma in a Solar Active Region

The Astrophysical Journal
The solar corona is much hotter than lower layers of the solar atmosphere—the photosphere and chromosphere. The coronal temperature is up to 1 MK in quiet Sun areas, while up to several megakelvins in active regions, which implies a key role of the ...
Gregory D. Fleishman, Alexey A. Kuznetsov, Gelu M. Nita   +2 more
doaj   +1 more source

Five-minute Periodicities in the Population of Solar Coronal Brightenings

The Astrophysical Journal
The population of small-scale brightenings observed across broad regions of the quiet-Sun (QS) corona shows coherent strong periodicities of ≈5 minutes and amplitudes of 20% to 30% of the mean.
Huw Morgan, Yeghiazar Taroyan, Harshita Gandhi, Llŷr Humphries, Shaktivel Pillai   +4 more
doaj   +1 more source

Modeling of Condensations in Coronal Loops Produced by Impulsive Heating with Variable Frequencies and Locations

The Astrophysical Journal
We present the results of models of impulsively heated coronal loops using the 1D hydrodynamic Adaptively Refined Godunov Solver code. The impulsive heating events (which we refer to as nanoflares ) are modeled by discrete pulses of energy along the loop.
Therese A. Kucera, James A. Klimchuk, Manuel Luna   +2 more
doaj   +1 more source

Spectroscopy at the solar limb: II. Are spicules heated to coronal temperatures ?

, 2016
Spicules of the so-called type II were suggested to be relevant for coronal heating because of their ubiquity on the solar surface and their eventual extension into the corona.
Beck, C., Fabbian, D., Puschmann, K. G., Rezaei, R.   +3 more
core   +1 more source

Measurements of Coronal Faraday Rotation at 4.6 Solar Radii

, 2014
Many competing models for the coronal heating and acceleration mechanisms of the high-speed solar wind depend on the solar magnetic field and plasma structure in the corona within heliocentric distances of $5R_\odot$.
Buffo, Jacob J., Fischer, Patrick D., Kooi, Jason E., Spangler, Steven R.   +3 more
core   +1 more source

Reconnection Nanojets in an Erupting Solar Filament with Unprecedented High Speeds

The Astrophysical Journal Letters
Solar nanojets are small-scale jets generated by component magnetic reconnection, characterized by collimated plasma motion perpendicular to the reconnecting magnetic field lines.
Yuhang Gao, Hui Tian, David Berghmans, Yadan Duan, Tom Van Doorsselaere, Hechao Chen, Emil Kraaikamp   +6 more
doaj   +1 more source

Self-Regulation of Solar Coronal Heating Process via Collisionless Reconnection Condition

, 2007
I propose a new paradigm for solar coronal heating viewed as a self-regulating process keeping the plasma marginally collisionless. The mechanism is based on the coupling between two effects.
D. A. Uzdensky, Dmitri A. Uzdensky, E. N. Parker, H. E. Petschek, M. Scholer, M. Ugai, P. A. Sweet, R. M. Kulsrud   +7 more
core   +1 more source

Energy conversion in the coronal plasma [PDF]

Solar and stellar X-ray emission are the observed waste products of the interplay between magnetic fields and the motion of stellar plasma. Theoretical understanding of the process of coronal heating is of utmost importance, since the high temperature is
Martens, P. C. H.
core   +1 more source

Modeling Time-variable Elemental Abundances in Coronal Loop Simulations

The Astrophysical Journal Letters
Numerous recent X-ray observations of coronal loops in both active regions and solar flares have shown clearly that elemental abundances vary with time.
Jeffrey W. Reep, John Unverferth, Will T. Barnes, Sherry Chhabra   +3 more
doaj   +1 more source