Results 51 to 60 of about 19,921 (169)

Intrinsic magnetic discontinuities and solar X‐ray emission

Geophysical Research Letters, 1990
The fundamental theorem of magnetostatic equilibrium predicts that the bipolar magnetic fields of active regions on the Sun contain tangential discontinuities as an intrinsic part of their equilibrium. It appears that rapid reconnection at these many tangential discontinuities (nanoflares) is the primary source of heat that produces the X‐ray emitting ...
openaire   +1 more source

Soft X-Ray Energy Spectra in the Wide-field Galactic Disk Area Revealed with HaloSat

The Astrophysical Journal
We analyzed data from HaloSat observations for five fields in the Galactic disk located far away from the Galactic center (135° < l < 254°) to understand the nature of soft X-ray energy emission in the Galactic disk. The fields have 14° diameter and were
Kazuki Ampuku, Ikuyuki Mitsuishi, Koki Sakuta, Philip Kaaret, Daniel M. LaRocca, Lorella Angelini   +5 more
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The Bursty Nature of Solar Flare X‐Ray Emission

The Astrophysical Journal, 2007
The complex and highly varying temporal nature of emission from an X4.8 flare is studied across seven X-ray energy bands. A wavelet transform modulus maxima method is used to obtain the multifractal spectra of the temporal variation of the X-ray emission.
R. T. James McAteer, C. Alex Young, Jack Ireland, Peter T. Gallagher   +3 more
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Reconnection-driven Decaying Pulsations Modulated by Slow Magnetoacoustic Waves

The Astrophysical Journal Supplement Series
Decaying pulsations have been simultaneously detected in the low-energy X-rays of solar/stellar flares, which are supposed to be associated with standing slow magnetoacoustic or kink-mode waves.
Dong Li, Jianping Li, Haisheng Ji
doaj   +1 more source

Two Phases of Particle Acceleration of a Solar Flare Associated with In Situ Energetic Particles

The Astrophysical Journal
How impulsive solar energetic particle (SEP) events are produced by magnetic-reconnection-driven processes during solar flares remains an outstanding question.
Meiqi Wang, Bin Chen, Trevor Knuth, Christina Cohen, Jeongwoo Lee, Haimin Wang, Sijie Yu   +6 more
doaj   +1 more source

Determining the Nanoflare Heating Frequency of an X-Ray Bright Point Observed by MaGIXS

The Astrophysical Journal
Nanoflares are thought to be one of the prime candidates that can heat the solar corona to its multimillion kelvin temperature. Individual nanoflares are difficult to detect with the present generation of instruments, but their presence can be inferred ...
Biswajit Mondal, P. S. Athiray, Amy R. Winebarger, Sabrina L. Savage, Ken Kobayashi, Stephen Bradshaw, Will Barnes, Patrick R. Champey, Peter Cheimets, Jaroslav Dudík, Leon Golub, Helen E. Mason, David E. McKenzie, Christopher S. Moore, Chad Madsen, Katharine K. Reeves, Paola Testa, Genevieve D. Vigil, Harry P. Warren, Robert W. Walsh, Giulio Del Zanna   +20 more
doaj   +1 more source

Hard X‐Ray Emissions from Partially Occulted Solar Flares

The Astrophysical Journal, 2008
Observations of solar flares partially occulted by the solar limb provide diagnostics of coronal hard X-ray (HXR) emissions in the absence of generally much brighter emissions from footpoints of flare loops. In this paper, a statistical survey of 55 partially occulted flares observed by the Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI ...
Sam Krucker, R. P. Lin
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Disentangling Thermal and Abundance Characteristics in a Solar Flare Using SDO/AIA, Hinode/XRT, and MinXSS-1 Observations

The Astrophysical Journal
We investigate the thermal properties of a solar flare by the observations of the soft X-ray Telescope on board Hinode and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. Our analysis reveals a tenuous but hot plasma cloud
Xiaoyan Xie, Anna Chen, Crisel Suarez, Katharine K. Reeves, Soumya Roy, Christopher S. Moore, Nishu Karna, Joy Velasquez   +7 more
doaj   +1 more source

A Systematic Study of Inverting Overlappograms: MaGIXS—A Case Study

The Astrophysical Journal
Slitless (or wide-field) imaging spectroscopy provides simultaneous imaging and spectral information from a wide field of view, allowing for rapid spectroscopic data collection from extended sources. Depending on the size of the extended source, combined
P. S. Athiray, Arthur Hochedez, Amy R. Winebarger, Dyana Beabout   +3 more
doaj   +1 more source

On the apparent line-of-sight alignment of the peak X-ray intensity of the magnetosheath and the tangent to the magnetopause, as viewed by SMILE-SXI

Earth and Planetary Physics
The Soft X-ray Imager (SXI) on board the Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) spacecraft will be able to view the Earth’s magnetosheath in soft X-rays.
Andrew Read
doaj   +1 more source