Results 1 to 10 of about 41,517 (188)

A Space Weather mission concept: Observatories of the Solar Corona and Active Regions (OSCAR) [PDF]

Journal of Space Weather and Space Climate, 2015
Coronal Mass Ejections (CMEs) and Corotating Interaction Regions (CIRs) are major sources of magnetic storms on Earth and are therefore considered to be the most dangerous space weather events. The Observatories of Solar Corona and Active Regions (OSCAR)
Strugarek Antoine, Janitzek Nils, Lee Arrow, Löschl Philipp, Seifert Bernhard, Hoilijoki Sanni, Kraaikamp Emil, Mrigakshi Alankrita Isha, Philippe Thomas, Spina Sheila, Bröse Malte, Massahi Sonny, O’Halloran Liam, Blanco Victor Pereira, Stausland Christoffer, Escoubet Philippe, Kargl Günter   +16 more
doaj   +7 more sources

The solar corona as an active medium for magnetoacoustic waves [PDF]

Plasma Physics and Controlled Fusion, 2021
Abstract The presence and interplay of continuous cooling and heating processes maintaining the corona of the Sun at the observed one million K temperature were recently understood to have crucial effects on the dynamics and stability of magnetoacoustic (MA) waves.
D Y Kolotkov, D I Zavershinskii, V M Nakariakov   +2 more
openaire   +2 more sources

Dominance of Bursty over Steady Heating of the 4–8 MK Coronal Plasma in a Solar Active Region: Quantification Using Maps of Minimum, Maximum, and Average Brightness

The Astrophysical Journal, 2022
A challenge in characterizing active region (AR) coronal heating is in separating transient (bursty) loop heating from the diffuse background (steady) heating.
Sanjiv K. Tiwari, Lucy A. Wilkerson, Navdeep K. Panesar, Ronald L. Moore, Amy R. Winebarger   +4 more
doaj   +1 more source

The First Flight of the Marshall Grazing Incidence X-Ray Spectrometer (MaGIXS)

The Astrophysical Journal, 2023
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) sounding rocket experiment launched on 2021 July 30 from the White Sands Missile Range in New Mexico.
Sabrina L. Savage, Amy R. Winebarger, Ken Kobayashi, P. S. Athiray, Dyana Beabout, Leon Golub, Robert W. Walsh, Brent Beabout, Stephen Bradshaw, Alexander R. Bruccoleri, Patrick R. Champey, Peter Cheimets, Jonathan Cirtain, Edward E. DeLuca, Giulio Del Zanna, Jaroslav Dudík, Anthony Guillory, Harlan Haight, Ralf K. Heilmann, Edward Hertz, William Hogue, Jeffery Kegley, Jeffery Kolodziejczak, Chad Madsen, Helen Mason, David E. McKenzie, Jagan Ranganathan, Katharine K. Reeves, Bryan Robertson, Mark L. Schattenburg, Jorg Scholvin, Richard Siler, Paola Testa, Genevieve D. Vigil, Harry P. Warren, Benjamin Watkinson, Bruce Weddendorf, Ernest Wright   +37 more
doaj   +1 more source

Fundamental transverse vibrations of the active region solar corona [PDF]

Astronomy & Astrophysics, 2019
Context. Some high-resolution observations have revealed that the active region solar corona is filled with a myriad of thin strands even in apparently uniform regions with no resolved loops. This fine structure can host collective oscillations involving a large portion of the corona due to the coupling of the motions of the neighbouring strands. Aims.
Luna, M., Oliver, R., Antolin, P., Arregui, I.   +3 more
openaire   +6 more sources

Properties of Flare-imminent versus Flare-quiet Active Regions from the Chromosphere through the Corona. I. Introduction of the AIA Active Region Patches (AARPs)

The Astrophysical Journal, 2023
We begin here a series of papers examining the chromospheric and coronal properties of solar active regions. This first paper describes an extensive data set of images from the Atmospheric Imaging Assembly on the Solar Dynamics Observatory curated for ...
Karin Dissauer, K. D. Leka, Eric L. Wagner   +2 more
doaj   +1 more source

Solar activity cycle and rotation of the corona [PDF]

Astronomy & Astrophysics, 2002
In this paper we consider the dependence of the coronal rotation period on solar activity. We analyzed the 10.7 cm radio emission flux covering cycles 19 to 22. We have established a new method for studying the rotation rate: by identifying the flux pulses with the recurrence of active longitudes.
Mouradian, Zadig, Bocchia, R., Botton, C.   +2 more
openaire   +2 more sources

High-resolution Observations of the Low Atmospheric Response to Small Coronal Heating Events in an Active Region Core

The Astrophysical Journal, 2023
High-resolution spectral observations of the lower solar atmosphere (chromosphere and transition region) during coronal heating events, in combination with predictions from models of impulsively heated loops, provide powerful diagnostics of the ...
Paola Testa, Helle Bakke, Luc Rouppe van der Voort, Bart De Pontieu   +3 more
doaj   +1 more source

THE ROLE OF RADIO WAVE PROPAGATION EFFECTS IN THE SOLAR CORONA TO INTERPRET THE BEHIND-LIMB BURSTS

Radio Physics and Radio Astronomy, 2016
Purpose: The radio emission propagation of solar radio bursts in the solar corona which sources are located on the far side of the Sun relative to the observer on Earth is studied.
A. A. Stanislavsky
doaj   +1 more source

Co-existence of two plasma phases in solar and AGN coronas [PDF]

Serbian Astronomical Journal, 1998
Here we have juxtaposed two distant cosmic locations of the Sun and AGN where neutral hydrogen appears in a close connection with hot coronas. Besides the solar photosphere, chromosphere and prominences where the presence of neutral hydrogen is ...
Kubičela A., Arsenijević J., Popović L.Č., Trajković N., Bon E.   +4 more
doaj   +1 more source