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Start Over Author "Salvo, L." Publication Type Academic Journals
261 results on '"Salvo, L."'

2. Metis Observation of the Onset of Fully Developed Turbulence in the Solar Corona

Author

Daniele Telloni, Luca Sorriso-Valvo, Gary P. Zank, Marco Velli, Vincenzo Andretta, Denise Perrone, Raffaele Marino, Francesco Carbone, Antonio Vecchio, Laxman Adhikari, Lingling Zhao, Sabrina Guastavino, Fabiana Camattari, Chen Shi, Nikos Sioulas, Zesen Huang, Marco Romoli, Ester Antonucci, Vania Da Deppo, Silvano Fineschi, Catia Grimani, Petr Heinzel, John D. Moses, Giampiero Naletto, Gianalfredo Nicolini, Daniele Spadaro, Marco Stangalini, Luca Teriaca, Michela Uslenghi, Lucia Abbo, Frédéric Auchère, Regina Aznar Cuadrado, Arkadiusz Berlicki, Roberto Bruno, Aleksandr Burtovoi, Gerardo Capobianco, Chiara Casini, Marta Casti, Paolo Chioetto, Alain J. Corso, Raffaella D’Amicis, Yara De Leo, Michele Fabi, Federica Frassati, Fabio Frassetto, Silvio Giordano, Salvo L. Guglielmino, Giovanna Jerse, Federico Landini, Alessandro Liberatore, Enrico Magli, Giuseppe Massone, Giuseppe Nisticò, Maurizio Pancrazzi, Maria G. Pelizzo, Hardi Peter, Christina Plainaki, Luca Poletto, Fabio Reale, Paolo Romano, Giuliana Russano, Clementina Sasso, Udo Schühle, Sami K. Solanki, Leonard Strachan, Thomas Straus, Roberto Susino, Rita Ventura, Cosimo A. Volpicelli, Joachim Woch, Luca Zangrilli, Gaetano Zimbardo, and Paola Zuppella

Subjects
Magnetohydrodynamics, Interplanetary turbulence, Space plasmas, Solar corona, Solar wind, Astrophysics, QB460-466
Abstract

This Letter reports the first observation of the onset of fully developed turbulence in the solar corona. Long time series of white-light coronal images, acquired by Metis aboard Solar Orbiter at 2 minutes cadence and spanning about 10 hr, were studied to gain insight into the statistical properties of fluctuations in the density of the coronal plasma in the time domain. From pixel-by-pixel spectral frequency analysis in the whole Metis field of view, the scaling exponents of plasma fluctuations were derived. The results show that, over timescales ranging from 1 to 10 hr and corresponding to the photospheric mesogranulation-driven dynamics, the density spectra become shallower moving away from the Sun, resembling a Kolmogorov-like spectrum at 3 R _⊙ . According to the latest observation and interpretive work, the observed 5/3 scaling law for density fluctuations is indicative of the onset of fully developed turbulence in the corona. Metis observation-based evidence for a Kolmogorov turbulent form of the fluctuating density spectrum casts light on the evolution of 2D turbulence in the early stages of its upward transport from the low corona.

Published
2024
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5. The Solar Particle Acceleration Radiation and Kinetics (SPARK) Mission Concept

Author

Hamish A. S. Reid, Sophie Musset, Daniel F. Ryan, Vincenzo Andretta, Frédéric Auchère, Deborah Baker, Federico Benvenuto, Philippa Browning, Éric Buchlin, Ariadna Calcines Rosario, Steven D. Christe, Alain Jody Corso, Joel Dahlin, Silvia Dalla, Giulio Del Zanna, Carsten Denker, Jaroslav Dudík, Robertus Erdélyi, Ilaria Ermolli, Lyndsay Fletcher, Andrzej Fludra, Lucie M. Green, Mykola Gordovskyy, Salvo L. Guglielmino, Iain Hannah, Richard Harrison, Laura A. Hayes, Andrew R. Inglis, Natasha L. S. Jeffrey, Jana Kašparová, Graham S. Kerr, Christian Kintziger, Eduard P. Kontar, Säm Krucker, Timo Laitinen, Philippe Laurent, Olivier Limousin, David M. Long, Shane A. Maloney, Paolo Massa, Anna Maria Massone, Sarah Matthews, Tomasz Mrozek, Valery M. Nakariakov, Susanna Parenti, Michele Piana, Vanessa Polito, Melissa Pesce-Rollins, Paolo Romano, Alexis P. Rouillard, Clementina Sasso, Albert Y. Shih, Marek Stęślicki, David Orozco Suárez, Luca Teriaca, Meetu Verma, Astrid M. Veronig, Nicole Vilmer, Christian Vocks, and Alexander Warmuth

Subjects
particle acceleration, magnetic reconnection, instrumentation, corona, coronal mass ejections (CMEs), flares, Motor vehicles. Aeronautics. Astronautics, TL1-4050
Abstract

Particle acceleration is a fundamental process arising in many astrophysical objects, including active galactic nuclei, black holes, neutron stars, gamma-ray bursts, accretion disks, solar and stellar coronae, and planetary magnetospheres. Its ubiquity means energetic particles permeate the Universe and influence the conditions for the emergence and continuation of life. In our solar system, the Sun is the most energetic particle accelerator, and its proximity makes it a unique laboratory in which to explore astrophysical particle acceleration. However, despite its importance, the physics underlying solar particle acceleration remain poorly understood. The SPARK mission will reveal new discoveries about particle acceleration through a uniquely powerful and complete combination of γ-ray, X-ray, and EUV imaging and spectroscopy at high spectral, spatial, and temporal resolutions. SPARK’s instruments will provide a step change in observational capability, enabling fundamental breakthroughs in our understanding of solar particle acceleration and the phenomena associated with it, such as the evolution of solar eruptive events. By providing essential diagnostics of the processes that drive the onset and evolution of solar flares and coronal mass ejections, SPARK will elucidate the underlying physics of space weather events that can damage satellites and power grids, disrupt telecommunications and GPS navigation, and endanger astronauts in space. The prediction of such events and the mitigation of their potential impacts are crucial in protecting our terrestrial and space-based infrastructure.

Published
2023
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7. Coronal Heating Rate in the Slow Solar Wind

Author

Daniele Telloni, Marco Romoli, Marco Velli, Gary P. Zank, Laxman Adhikari, Cooper Downs, Aleksandr Burtovoi, Roberto Susino, Daniele Spadaro, Lingling Zhao, Alessandro Liberatore, Chen Shi, Yara De Leo, Lucia Abbo, Federica Frassati, Giovanna Jerse, Federico Landini, Gianalfredo Nicolini, Maurizio Pancrazzi, Giuliana Russano, Clementina Sasso, Vincenzo Andretta, Vania Da Deppo, Silvano Fineschi, Catia Grimani, Petr Heinzel, John D. Moses, Giampiero Naletto, Marco Stangalini, Luca Teriaca, Michela Uslenghi, Arkadiusz Berlicki, Roberto Bruno, Gerardo Capobianco, Giuseppe E. Capuano, Chiara Casini, Marta Casti, Paolo Chioetto, Alain J. Corso, Raffaella D’Amicis, Michele Fabi, Fabio Frassetto, Marina Giarrusso, Silvio Giordano, Salvo L. Guglielmino, Enrico Magli, Giuseppe Massone, Mauro Messerotti, Giuseppe Nisticò, Maria G. Pelizzo, Fabio Reale, Paolo Romano, Udo Schühle, Sami K. Solanki, Thomas Straus, Rita Ventura, Cosimo A. Volpicelli, Luca Zangrilli, Gaetano Zimbardo, Paola Zuppella, Stuart D. Bale, and Justin C. Kasper

Subjects
Magnetohydrodynamics, Magnetohydrodynamical simulations, Interplanetary turbulence, Solar corona, Solar coronal heating, Solar wind, Astrophysics, QB460-466
Abstract

This Letter reports the first observational estimate of the heating rate in the slowly expanding solar corona. The analysis exploits the simultaneous remote and local observations of the same coronal plasma volume, with the Solar Orbiter/Metis and the Parker Solar Probe instruments, respectively, and relies on the basic solar wind magnetohydrodynamic equations. As expected, energy losses are a minor fraction of the solar wind energy flux, since most of the energy dissipation that feeds the heating and acceleration of the coronal flow occurs much closer to the Sun than the heights probed in the present study, which range from 6.3 to 13.3 R _⊙ . The energy deposited to the supersonic wind is then used to explain the observed slight residual wind acceleration and to maintain the plasma in a nonadiabatic state. As derived in the Wentzel–Kramers–Brillouin limit, the present energy transfer rate estimates provide a lower limit, which can be very useful in refining the turbulence-based modeling of coronal heating and subsequent solar wind acceleration.

Published
2023
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28. Thermal ageing and creep damage in 316L(N) alloys: a 3D analysis.

Author

Ozdemir, Oguz, Valiyev, S., Montes, S.M., Ferrie, E., Blat-Yrieix, M., Delabrouille, F., and Salvo, L.

Subjects
ALLOY analysis, AUSTENITIC stainless steel, STAINLESS steel
Abstract

Creep behaviour of two alloys, namely, classical 316 L(N), labelled as LN, and nitrogen-modified 316 L(N), labelled as an HN, in this present work, have been studied at 575 °C at a stress level of 310 MPa. 3D analyses have been done by using two different X-ray sources. Additions of nitrogen in 316 L(N) have been demonstrated to be beneficial for extending the life of austenitic stainless steels, decreasing the creep damage. Creep cavities have been classified based on their shape, and the growth orientation of cavities is analysed. Even though the total lifetime of LN sample is shorter (649 h) compared to HN (9203 h), it exhibits more cavities. The orientation of the cavities and the complex shape of cavities have been proving that stress direction has a huge effect on the LN sample damage development with a concentration of 10° and 90°. [ABSTRACT FROM AUTHOR]

Published
2022
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46. Abstracts of learning resource centre

Author

Pistolesi, C., Messori, A., Mangues M. A., Farré R., Bonal J., Troncon, M. G., Cattaruzzi, C., Simon, G., De Rosa, M., Piantadosi, S., Musi, A., Bianchi, G., Covezzoli, Rago, S., De Rosa, M., Busca, P., Clark, C. M., Goldberg, L. A., Goffredo, Franca, Idoate, A., Giráldez, J., Idoipe, A., Garrido-Lestache, S., Marco, D. García, Delgado, E., de Juana, P., Bermejo, T., Pandolfi, A., Marangolo, M., Amiel, M. -L., Husson, M. -C., Cozzolino, S., Mancini, A., Zeuli, L., Scala, D., Lattarulo, M., Di Salvo, L., van Mil, J. W. F., Rampazzo, R., Direzione Regionale della Sanità. Regione Friuli — Venezia Giulia, and Gruppo Regionale di epidemiologia del farmaco. Regione Friuli-V Giulia

Published
1994
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