Results 41 to 50 of about 14,687 (203)

The Temperature and Density Structure of the Solar Corona. I. Observations of the Quiet Sun with the EUV Imaging Spectrometer (EIS) on Hinode

, 2009
Measurements of the temperature and density structure of the solar corona provide critical constraints on theories of coronal heating. Unfortunately, the complexity of the solar atmosphere, observational uncertainties, and the limitations of current ...
Allen, Brooks, Brown, Cargill, Craig, David H. Brooks, Doschek, Feldman, Feldman, Feldman, Feldman, Harry P. Warren, Kashyap, Kashyap, Ko, Landi, Landi, Patsourakos, Patsourakos, Tripathi, Warren, Warren, Warren, Widing, Winebarger, Young, Young   +26 more
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Time-dependent Dynamics of the Corona

The Astrophysical Journal Letters, 2023
We present in this Letter the first global comparison between traditional line-tied steady-state magnetohydrodynamic models and a new, fully time-dependent thermodynamic magnetohydrodynamic simulation of the global corona. To approximate surface magnetic
Emily I. Mason, Roberto Lionello, Cooper Downs, Jon A. Linker, Ronald M. Caplan, Marc L. DeRosa   +5 more
doaj   +1 more source

Evidence of photospheric vortex flows at supergranular junctions observed by FG/SOT (Hinode) [PDF]

, 2008
Twisting motions of different nature are observed in several layers of the solar atmosphere. Chromospheric sunspot whorls and rotation of sunspots or even higher up in the lower corona sigmoids are examples of the large scale twisted topology of many ...
Berger, Bonet, Brandt, D. E. Innes, H. E. Potts, Krijger, Meunier, Potts, Potts, R. Attie, Rieutord, Roudier, Shine, Wang, Welsch, Zirker   +15 more
core   +1 more source

Role of Small-scale Impulsive Events in Heating the X-Ray Bright Points of the Quiet Sun

The Astrophysical Journal, 2023
Small-scale impulsive events, known as nanoflares, are thought to be one of the prime candidates that can keep the solar corona hot at its multimillion-Kelvin temperature.
Biswajit Mondal, James A Klimchuk, Santosh V. Vadawale, Aveek Sarkar, Giulio Del Zanna, P. S. Athiray, N. P. S. Mithun, Helen E. Mason, Anil Bhardwaj   +8 more
doaj   +1 more source

Newly Discovered Global Temperature Structures in the Quiet Sun at Solar Minimum [PDF]

, 2012
Magnetic loops are building blocks of the closed-field corona. While active region loops are readily seen in images taken at EUV and X-ray wavelengths, quiet Sun loops are seldom identifiable and therefore difficult to study on an individual basis.
Alberto M. Vásquez, Antiochos, Aschwanden, Aschwanden, Craig, Enrico Landi, Feldman, Frazin, Frazin, Frazin, Landi, Pasachoff, Patsourakos, Reale, Richard A. Frazin, Schrijver, Schrijver, Tamas I. Gombosi, Tripathi, Tóth, Viall, Wang, Ward B. Manchester, Warren, Winebarger, Zhenguang Huang   +25 more
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Beyond small-scale transients: A closer look at the diffuse quiet solar corona

Astronomy & Astrophysics, 2023
Aims. Within the quiet Sun corona imaged at 1 MK, much of the field of view consists of diffuse emission that appears to lack the spatial structuring that is so evident in coronal loops or bright points. Our aim is to determine if these diffuse regions are categorically different in terms of their intensity fluctuations and spatial configuration from ...
Gorman, J., Chitta, L., Peter, H., Berghmans, D., Auchère, F., Aznar Cuadrado, R., Teriaca, L., Solanki, S., Verbeeck, C., Kraaikamp, E., Stegen, K., Gissot, S.   +11 more
openaire   +3 more sources

Modeling the Daily Variations of the Coronal X-ray Spectral Irradiance with Two Temperatures and Two Emission Measures

The Astrophysical Journal, 2023
The Miniature X-ray Solar Spectrometer (MinXSS-1) CubeSat observed solar X-rays between 0.5 and 10 keV. A two-temperature, two-emission-measure model is fit to each daily averaged spectrum.
Bennet D. Schwab, Thomas N. Woods, James Paul Mason   +2 more
doaj   +1 more source

Multimodal Differential Emission Measure in the Solar Corona [PDF]

, 2015
The Atmospheric Imaging Assembly (AIA) telescope on board the Solar Dynamics Observatory (SDO) provides coronal EUV imaging over a broader temperature sensitivity range than the previous generations of instruments (EUVI, EIT, and TRACE).
Frazin, Richard, Landi, Enrico, Nuevo, Federico A., Vásquez, Alberto M.   +3 more
core   +2 more sources

Hinode/EIS Observation of the Alfvénic Fluctuations in the Quiet Sun

The Astrophysical Journal
Alfvénic fluctuations in the corona are regularly observed in EUV imaging and infrared spectroscopic data. We report here on the Doppler velocity fluctuations within the data from the Extreme-Ultraviolet Imaging Spectrometer (EIS) on board Hinode.
Edris Tajfirouze, Richard Morton, Peter R. Young   +2 more
doaj   +1 more source

New views on the emission and structure of the solar transition region

, 2010
The Sun is the only star that we can spatially resolve and it can be regarded as a fundamental plasma laboratory of astrophysics. The solar transition region (TR), the layer between the solar chromosphere and corona, plays an important role in solar wind
Aiouaz, Aiouaz, Athay, Athay, Axford, Bartoe, Bartoe, Bartoe, Basri, Bocchialini, Bohlin, Bonnet, Brekke, Brosius, Brosius, Brosius, Brown, Brueckner, Brueckner, Brueckner, Brynildsen, Büchner, Büchner, Chae, Chae, Chae, Chen, Chen, Chen, Chuanyi Tu, Culhane, Curdt, Curdt, Curdt, Curdt, Curdt, Curdt, Dammasch, Dammasch, De Pontieu, Del Zanna, Dere, Dere, Dere, Doschek, Doschek, Doschek, Dowdy, Doyle, Doyle, Doyle, Doyle, Eckart Marsch, Evershed, Evershed, Falconer, Fang, Feldman, Feldman, Feldman, Fontenla, Fontenla, Foukal, Foukal, Foukal, Gabriel, Golub, Gontikakis, Gouttebroze, Gouttebroze, Griffiths, Gunár, Guo, Habbal, Hansteen, Hansteen, Harra, Harrison, Harrison, Hassler, He, He, He, Heinzel, Hui Tian, Hénoux, Ichimoto, Imada, Innes, Innes, Jiansen He, Jin, Jordan, Katsukawa, Kneer, Lemaire, Lemaire, Lemaire, Li, Liu, Longcope, Madjarska, Madjarska, Magara, Mariska, Mariska, Marsch, Marsch, Marsch, Marsch, Marsch, Marsch, McClymont, McIntosh, McIntosh, McIntosh, McIntosh, Metcalf, Nicolas, Nicolas, Parnell, Patsourakos, Peter, Peter, Peter, Peter, Peter, Popescu, Priest, Raju, Ravindra, Reeves, Sakao, Santos, Schmieder, Schrijver, Seehafer, Sheeley, Solanki, Stucki, Teriaca, Teriaca, Teriaca, Teriaca, Teriaca, Teriaca, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tian, Tu, Tu, Tu, Ugarte-Urra, Ugarte-Urra, Ugarte-Urra, Vernazza, Vernazza, Vial, Vial, Vial, Wang, Wang, Warren, Watanabe, Webb, Werner Curdt, Wiegelmann, Wiegelmann, Wiegelmann, Wilhelm, Wilhelm, Wilhelm, Wilhelm, Wilhelm, Xia, Xia, Xia, Xu, Zhang, Zhang, Zhang, Zhang, Zhang, Zhang   +192 more
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