Results 71 to 80 of about 429,319 (205)

An In-depth Analysis of Quiet-Sun IRIS Brightenings

The Astrophysical Journal
Small-scale brightenings are ubiquitous, dynamic, and energetic phenomena found in the chromosphere. An advanced filter-detection algorithm applied to high-resolution observations from the Interface Region Imaging Spectrograph enables the detection of ...
Llŷr Dafydd Humphries, Huw Morgan, David Kuridze   +2 more
doaj   +1 more source

Quantifying Spicules

, 2012
Understanding the dynamic solar chromosphere is fundamental in solar physics. Spicules are an important feature of the chromosphere, connecting the photosphere to the corona, potentially mediating the transfer of energy and mass.
Anan, Bart De Pontieu, Beckers, Carlsson, De Pontieu, De Pontieu, De Pontieu, Hansteen, Heggland, Heggland, Judge, Langangen, Liu, Martínez-Sykora, Martínez-Sykora, Mats Carlsson, Matsumoto, McIntosh, Moore, Pereira, Rouppe van der Voort, Rouppe van der Voort, Sekse, Suematsu, Tiago M. D. Pereira, Tsiropoula, Zhang   +26 more
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Oscillations observed in umbra, plage, quiet-Sun and the polarity inversion line of active region 11158 using Helioseismic Magnetic Imager/Solar Dynamics Observatory data. [PDF]

Philos Trans A Math Phys Eng Sci, 2021
Norton AA, Stutz RB, Welsch BT.
europepmc   +1 more source

Hinode/Extreme-Ultraviolet Imaging Spectrometer Observations of the Temperature Structure of the Quiet Corona

, 2009
We present a Differential Emission Measure (DEM) analysis of the quiet solar corona on disk using data obtained by the Extreme-ultraviolet Imaging Spectrometer (EIS) on {\it Hinode}.
Aschwanden, Aschwanden, Brooks, Brooks, Brown, Bryans, David H. Brooks, David R. Williams, Harry P. Warren, Jordan, Kashyap, Kashyap, Landi, Lenz, Markwardt, Schmelz, Schrijver, Summers, Tetsuya Watanabe, Warren, Warren, Warren, Watanabe, Young, Young, Young   +25 more
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Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT

The Astrophysical Journal Letters
The steady-state gamma-ray emission from the Sun is thought to consist of two emission components due to interactions with Galactic cosmic rays: (1) a hadronic disk component, and (2) a leptonic extended component peaking at the solar edge and extending ...
A. Acharyya, A. Adelfio, M. Ajello, L. Baldini, C. Bartolini, D. Bastieri, J. Becerra Gonzalez, R. Bellazzini, B. Berenji, E. Bissaldi, R. D. Blandford, R. Bonino, E. Bottacini, S. Buson, R. A. Cameron, P. A. Caraveo, F. Casaburo, F. Casini, E. Cavazzuti, D. Cerasole, N. Cibrario, S. Ciprini, G. Cozzolongo, P. Cristarella Orestano, F. Cuna, A. Cuoco, S. Cutini, F. D’Ammando, D. Depalo, S. W. Digel, N. Di Lalla, L. Di Venere, A. Domínguez, A. Fiori, Y. Fukazawa, P. Fusco, F. Gargano, C. Gasbarra, D. Gasparrini, S. Germani, F. Giacchino, N. Giglietto, M. Giliberti, F. Giordano, M. Giroletti, S. Guiriec, R. Gupta, M. Hashizume, E. Hays, J. W. Hewitt, A. Holzmann Airasca, D. Horan, X. Hou, T. Kayanoki, M. Kuss, S. Larsson, A. Laviron, J. Li, A. Liguori, I. Liodakis, P. Loizzo, F. Longo, F. Loparco, S. López Pérez, L. Lorusso, M. N. Lovellette, P. Lubrano, S. Maldera, A. Manfreda, G. Martí-Devesa, R. Martinelli, M. N. Mazziotta, J. E. McEnery, I. Mereu, M. Michailidis, P. F. Michelson, N. Mirabal, T. Mizuno, P. Monti-Guarnieri, M. E. Monzani, A. Morselli, I. V. Moskalenko, M. Negro, N. Omodei, E. Orlando, J. F. Ormes, D. Paneque, G. Panzarini, M. Persic, M. Pesce-Rollins, V. Petrosian, R. Pillera, G. Principe, S. Rainò, R. Rando, B. Rani, M. Razzano, A. Reimer, O. Reimer, M. Sánchez-Conde, P. M. Saz Parkinson, D. Serini, C. Sgrò, E. J. Siskind, P. Spinelli, D. Tak, L. Tibaldo, D. F. Torres, J. Valverde, Z. Wadiasingh, W. Zhang   +110 more
doaj   +1 more source

Velocity and Density Fluctuations in the Quiet Sun Corona

The Astrophysical Journal
We investigate the properties and relationship between Doppler velocity fluctuations and intensity fluctuations in the off-limb quiet Sun corona. These are expected to reflect the properties of Alfvénic and compressive waves, respectively.
Michael Hahn, Xiangrong Fu, Stefan J. Hofmeister, Yifan Huang, Alexandros Koukras, Daniel Wolf Savin   +5 more
doaj   +1 more source

3D Simulations of the Quiet Sun Radio Emission at Millimeter and Submillimeter Wavelengths [PDF]

Geofísica Internacional, 2008
We present 2D projections of 3D simulations of the quiet-sun radio-emission, at different frequencies on the centimeter-submillimeter wavelength range (specifically at 1.4, 3.9, 17, 34, 43, 110, 212 and 250 GHz). We have built a 3D, spherically symmetric,
E. Mendoza, A. Lara, V. de la Luz, M. Shimojo   +3 more
doaj  

Microwave structure of the quiet sun

The Astrophysical Journal, 1988
Two-frequency VLA observations of the quiet sun were obtained on July 13, 1985. Although the 4.9 GHz full-day synthesis maps correspond closely to images made in H-alpha, Ca II K, and magnetograms, the correspondence is much less apparent on shorter time scale maps, and it is suggested that the discrepancy is due to nearly continual variations in the ...
Dale E. Gary, Harold Zirin
openaire   +1 more source

The Plasma β in Quiet Sun Regions: Multi-instrument View

The Astrophysical Journal
A joint campaign of several spaceborne and ground-based observatories, such as the GREGOR solar telescope, the Extreme-ultraviolet Imaging Spectrometer (EIS), and the Interface Region Imaging Spectrograph (Hinode Observing Plan 381, 2019 October 11–22 ...
Jenny M. Rodríguez-Gómez, Christoph Kuckein, Sergio J. González Manrique, Jonas Saqri, Astrid Veronig, Peter Gömöry, Tatiana Podladchikova   +6 more
doaj   +1 more source

Quiet Sun Magnetic Field Measurements Based on Lines with Hyperfine Structure

, 2007
The Zeeman pattern of MnI lines is sensitive to hyperfine structure (HFS) and, they respond to hG magnetic field strengths differently from the lines used in solar magnetometry.
B. Viticchié, E. Landi Degl'Innocenti, F. Berrilli, Faurobert-Scholl M., J. Sánchez Almeida, Landi Degl'Innocenti E., Landi Degl'Innocenti E., Landi Degl'Innocenti E., Solanki S. K., Solanki S. K.   +9 more
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