Zobrazeno 1 - 10
of 146
pro vyhledávání: '"Paola, Testa"'
Autor:
Vanessa Polito, Marianne Peterson, Lindsay Glesener, Paola Testa, Sijie Yu, Katharine K. Reeves, Xudong Sun, Jessie Duncan
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 10 (2023)
In this work we analyze a small B-class flare that occurred on 29 April 2021 and was observed simultaneously by the Interface Region Imaging Spectrograph (IRIS) and the Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray instrument. The IRIS observa
Externí odkaz:
https://doaj.org/article/1dcf9a00de094115aec2d2d8294c44dc
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 33 (2024)
The origin of nonthermal broadening in solar spectra is one of the long-standing questions in solar physics. Various processes have been invoked—including unresolved flows, waves, and turbulent processes—but definitive answers are lacking. To inv
Externí odkaz:
https://doaj.org/article/c293ff8bc753426e907fc2dd2bec0cc5
Autor:
Norbert S. Schulz, David P. Huenemoerder, David A. Principe, Marc Gagne, Hans Moritz Günther, Joel Kastner, Joy Nichols, Andrew Pollock, Thomas Preibisch, Paola Testa, Fabio Reale, Fabio Favata, Claude R. Canizares
Publikováno v:
The Astrophysical Journal, Vol 970, Iss 2, p 190 (2024)
The Orion Nebula Cluster (ONC) is the closest site of very young (∼1 Myr) massive star formation The ONC hosts more than 1600 young and X-ray bright stars with masses ranging from ∼0.1–35 M _⊙ . The Chandra HETGS Orion Legacy Project observed
Externí odkaz:
https://doaj.org/article/7430833ccb4e4d6b913e5ce2de25dae6
Autor:
Biswajit Mondal, P. S. Athiray, Amy R. Winebarger, Sabrina L. Savage, Ken Kobayashi, Stephen Bradshaw, Will Barnes, Patrick R. Champey, Peter Cheimets, Jaroslav Dudík, Leon Golub, Helen E. Mason, David E. McKenzie, Christopher S. Moore, Chad Madsen, Katharine K. Reeves, Paola Testa, Genevieve D. Vigil, Harry P. Warren, Robert W. Walsh, Giulio Del Zanna
Publikováno v:
The Astrophysical Journal, Vol 967, Iss 1, p 23 (2024)
Nanoflares are thought to be one of the prime candidates that can heat the solar corona to its multimillion kelvin temperature. Individual nanoflares are difficult to detect with the present generation of instruments, but their presence can be inferr
Externí odkaz:
https://doaj.org/article/c0fb35d4000c49de86001bfcf94c097c
Autor:
David M. Long, Deborah Baker, Andy S. H. To, Lidia van Driel-Gesztelyi, David H. Brooks, Marco Stangalini, Mariarita Murabito, Alexander W. James, Mihalis Mathioudakis, Paola Testa
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 1, p 63 (2024)
The composition of the solar corona differs from that of the photosphere, with the plasma thought to fractionate in the solar chromosphere according to the first ionization potential (FIP) of the different elements. This produces a FIP bias, wherein
Externí odkaz:
https://doaj.org/article/57c3e388a81c4a13ab11abb23ce025f5
Publikováno v:
The Astrophysical Journal, Vol 956, Iss 2, p 85 (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 prope
Externí odkaz:
https://doaj.org/article/190d7f66f47f470780eb6d85492d84f7
Autor:
Juan Martínez-Sykora, Bart De Pontieu, Viggo H. Hansteen, Paola Testa, Q. M. Wargnier, Mikolaj Szydlarski
Publikováno v:
The Astrophysical Journal, Vol 949, Iss 2, p 112 (2023)
The ponderomotive force has been suggested to be the main mechanism to produce the so-called first ionization potential (FIP) effect—the enrichment of low-FIP elements observed in the outer solar atmosphere, in the solar wind, and in solar energeti
Externí odkaz:
https://doaj.org/article/61f42ea2d5354c38a2e9d190d7117679
Publikováno v:
The Astrophysical Journal, Vol 944, Iss 2, p 117 (2023)
The element abundances in the solar corona and solar wind are often different from those of the solar photosphere, typically with a relative enrichment of elements with low first ionization potential (FIP effect). Here, we study the spatial distribut
Externí odkaz:
https://doaj.org/article/8db9c26b602c4b8b8fd85a3dc6df13bd
Publikováno v:
The Astrophysical Journal, Vol 945, Iss 2, p 143 (2023)
Nanoflares are regarded as one of the major mechanisms of magnetic energy release and coronal heating in the solar outer atmosphere. We conduct a statistical study on the response of the chromosphere and transition region to nanoflares, as observed b
Externí odkaz:
https://doaj.org/article/f76bd9e0956649b3a0e95e8b84662aeb
Autor:
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
Publikováno v:
The Astrophysical Journal, Vol 945, Iss 2, p 105 (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. MaGIXS is a unique solar observing telescope developed to capture X-ray spectral images o
Externí odkaz:
https://doaj.org/article/260e18b44e2a420d996a18e504d221ac