(Phys.org)—Researchers at Sandia Labs have used a large x-ray machine to create high-density plasma that approximates the photosphere of white dwarf stars. The team has posted a paper describing the process and how it ...
The sun, the nearest star to us, is not as quiet as it seems, and multifarious solar activities happen every hour and moment. The occurrence of these phenomena is accompanied by the accumulation and release of energy, and ...
Astronomy
Jul 12, 2022
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Recently, a research team led by Dr.Li Yan from the Yunnan Observatories of the Chinese Academy of Sciences proposed a new means to explore the small-scale magnetic fields in the solar atmosphere through analyzing the frequencies ...
Astronomy
Aug 10, 2021
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596
A new approach to analyzing the development of magnetic tangles on the Sun has led to a breakthrough in a longstanding debate about how solar energy is injected into the solar atmosphere before being released into space, ...
Astronomy
Jul 21, 2021
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Cooperative operations between a solar observation satellite and a sounding-rocket telescope have measured the magnetic field strength in the photosphere and chromosphere above an active solar plage region. This is the first ...
Astronomy
Feb 19, 2021
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Scientists from the RIKEN Cluster for Pioneering Research and collaborators have used simulations to show that the photons emitted by long gamma-ray bursts, among the most energetic events to take place in the universe, originate ...
Astronomy
Apr 3, 2019
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327
(Phys.org) —The Sun is more spirited than previously thought. Apart from the solar eruptions, huge bursts of particles and radiation from the outer atmosphere of our star, also the cooler layer right below can be the site ...
Space Exploration
Oct 20, 2014
4
0
Researchers at NJIT's Big Bear Solar Observatory (BBSO) in Big Bear, CA have obtained new and remarkably detailed photos of the Sun with the New Solar Telescope (NST). The photographs reveal never-before-seen details of solar ...
Space Exploration
Aug 6, 2013
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(Phys.org) —Movies of giant loops projecting from the surface of the Sun are giving new insights into the complex mechanisms that drive solar flares and Coronal Mass Ejections (CMEs). These eruptions release vast energy ...
Space Exploration
Jul 2, 2013
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(Phys.org)—Scientists at Northumbria University have begun to unlock the mystery of why the outer edge of the Sun is much hotter than its surface for the first time.
Space Exploration
Feb 4, 2013
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The photosphere of an astronomical object is the region from which externally received light originates. The term itself is derived from Ancient Greek roots, φῶς, φωτός/phos, photos meaning "light" and σφαῖρα/sphaira meaning "sphere", in reference to the fact that it is a spheric surface perceived to emit light. It extends into a star's surface until the gas becomes opaque, equivalent to an optical depth of approximately 2/3. In other words, a photosphere is the deepest region of a luminous object, usually a star, that is transparent to photons of certain wavelengths.
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