Results 11 to 20 of about 2,790,834 (259)
MHD wave transmission in the Sun’s atmosphere [PDF]
Astronomy & Astrophysics, 2011 MHD wave propagation inside the Sun's atmosphere is closely related to the magnetic field topology. For example, magnetic fields are able to lower the cutoff frequency for acoustic waves thus allowing waves which would otherwise be trapped below the photosphere to propagate into the upper atmosphere. Another example is that MHD waves can be transmitted
Stangalini, M +3 more
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The young Sun's XUV-activity as a constraint for lower CO2-limits in the Earth's Archean atmosphere [PDF]
Earth and Planetary Science Letters, 2021 Despite their importance for determining the evolution of the Earth’s atmosphere and surface conditions, the evolutionary histories of the Earth’s atmospheric CO2 abundance during the Archean eon and the Sun’s activity are poorly constrained.
C. Johnstone +4 more
semanticscholar +1 more source
Waves in the lower solar atmosphere: the dawn of next-generation solar telescopes [PDF]
Living Reviews in Solar Physics, 2022 Waves and oscillations have been observed in the Sun’s atmosphere for over half a century. While such phenomena have readily been observed across the entire electromagnetic spectrum, spanning radio to gamma-ray sources, the underlying role of waves in ...
D. Jess +5 more
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A magnetic reconnection model for hot explosions in the cool atmosphere of the Sun [PDF]
Astronomy & Astrophysics, 2020 Context. Ultraviolet (UV) bursts and Ellerman bombs (EBs) are transient brightenings observed in the low solar atmospheres of emerging flux regions. Magnetic reconnection is believed to be the main mechanism leading to formation of the two activities ...
Lei Ni +4 more
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Alfvénic waves in the inhomogeneous solar atmosphere [PDF]
Reviews of Modern Plasma Physics, 2022 The solar atmosphere is known to be replete with magneto-hydrodynamic wave modes, and there has been significant investment in understanding how these waves propagate through the Sun’s atmosphere and deposit their energy into the plasma.
R. Morton +3 more
semanticscholar +1 more source
Upflows in the Upper Solar Atmosphere [PDF]
Solar Physics, 2021 Spectroscopic observations at extreme- and far-ultraviolet wavelengths have revealed systematic upflows in the solar transition region and corona. These upflows are best seen in the network structures of the quiet Sun and coronal holes, boundaries of ...
H. Tian +4 more
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The chemical make-up of the Sun: A 2020 vision [PDF]
Astronomy & Astrophysics, 2021 Context. The chemical composition of the Sun is a fundamental yardstick in astronomy, relative to which essentially all cosmic objects are referenced. As such, having accurate knowledge of the solar elemental abundances is crucial for an extremely broad ...
M. Asplund, A. Amarsi, N. Grevesse
semanticscholar +1 more source
A Heavy Molecular Weight Atmosphere for the Super-Earth π Men c [PDF]
, 2021 Strongly irradiated exoplanets develop extended atmospheres that can be utilized to probe the deeper planet layers. This connection is particularly useful in the study of small exoplanets, whose bulk atmospheres are challenging to characterize directly ...
A. G. Muñoz +6 more
semanticscholar +1 more source
Observed Local Dispersion Relations for Magnetoacoustic-gravity Waves in the Sun’s Atmosphere: Mapping the Acoustic Cutoff Frequency [PDF]
Astrophysical Journal, 2019 We present the observed local dispersion relations for magnetoacoustic-gravity waves in the Sun’s atmosphere for different levels of magnetic field strength.
S. Jefferies +3 more
semanticscholar +1 more source
On the Composition of the Sun's Atmosphere
The Astrophysical Journal, 1929 H. N. Russell
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