Reconnection nanojets in the solar corona

Paolo Pagano, Antonino Petralia, Fabio Reale, Paolo Pagano, Patrick Antolin, Antonino Petralia, Fabio Reale, Paola Testa, Paola Testa

Risultato della ricerca: Articlepeer review

Abstract

The solar corona is shaped and mysteriously heated to millions of degrees by the Sun’s magnetic field. It has long been hypothesized that the heating results from a myriad of tiny magnetic energy outbursts called nanoflares, driven by the fundamental process of magnetic reconnection. Misaligned magnetic field lines can break and reconnect, producing nanoflares in avalanche-like processes. However, no direct and unique observations of such nanoflares exist to date, and the lack of a smoking gun has cast doubt on the possibility of solving the coronal heating problem. From coordinated multi-band high-resolution observations, we report on the discovery of very fast and bursty nanojets, the telltale signature of reconnection-based nanoflares resulting in coronal heating. Using state-of-the-art numerical simulations, we demonstrate that the nanojet is a consequence of the slingshot effect from the magnetically tensed, curved magnetic field lines reconnecting at small angles. Nanojets are therefore the key signature of reconnection-based coronal heating in action.
Lingua originaleEnglish
pagine (da-a)54-62
Numero di pagine9
RivistaNature Astronomy
Volume5
Stato di pubblicazionePublished - 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

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