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Coronal Heating Rate in the Slow Solar Wind

Authors :
Telloni, Daniele
Romoli, Marco
Velli, Marco
Zank, Gary P.
Adhikari, Laxman
Downs, Cooper
Burtovoi, Aleksandr
Susino, Roberto
Spadaro, Daniele
Zhao, Lingling
Liberatore, Alessandro
Shi, Chen
De Leo, Yara
Abbo, Lucia
Frassati, Federica
Jerse, Giovanna
Landini, Federico
Nicolini, Gianalfredo
Pancrazzi, Maurizio
Russano, Giuliana
Sasso, Clementina
Andretta, Vincenzo
Da Deppo, Vania
Fineschi, Silvano
Grimani, Catia
Heinzel, Petr
Moses, John D.
Naletto, Giampiero
Stangalini, Marco
Teriaca, Luca
Uslenghi, Michela
Berlicki, Arkadiusz
Bruno, Roberto
Capobianco, Gerardo
Capuano, Giuseppe E.
Casini, Chiara
Casti, Marta
Chioetto, Paolo
Corso, Alain J.
D'Amicis, Raffaella
Fabi, Michele
Frassetto, Fabio
Giarrusso, Marina
Giordano, Silvio
Guglielmino, Salvo L.
Magli, Enrico
Massone, Giuseppe
Messerotti, Mauro
Nisticò, Giuseppe
Pelizzo, Maria G.
Reale, Fabio
Romano, Paolo
Schühle, Udo
Solanki, Sami K.
Straus, Thomas
Ventura, Rita
Volpicelli, Cosimo A.
Zangrilli, Luca
Zimbardo, Gaetano
Zuppella, Paola
Bale, Stuart D.
Kasper, Justin C.
Publication Year :
2023
Publisher :
arXiv, 2023.

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 solar radii. 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 non-adiabatic 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.

Details

Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....17683dbb5c62532471195848db29e268
Full Text :
https://doi.org/10.48550/arxiv.2306.10819