Tag: sole

Micro-flares and the problem of the coronal heating. The paper: “Coronal energy release by MHD avalanches. Effects on a structured, active region, multi-threaded coronal loop” of G. Cozzo (UNIPA) appeared on A&A

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The corona is the outermost part of the Solar atmosphere, filled with plasma at temperatures reaching several million degrees. The mechanism responsible for heating the Solar plasma to these temperatures is a long-standing problem. It began in the 1930s when physicists Bengt Edlen and Walter Grotrian proposed that the mysterious spectroscopic lines observed in the corona were not due to

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A joint study Solar Orbiter / Parker Solar Probe of the solar wind. The paper: “Connecting Solar Orbiter remote-sensing observations and Parker Solar Probe in situ measurements with a numerical MHD reconstruction of the Parker spiral” of R. Biondo (UNIPA/INAF-OATo) recently appeared on A&A

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Solar wind is made of charged particles (plasma) ejected by the coronal magnetic activity and travelling through the interplanetary space. Once these particles reach Earth and interact with the magnetosphere and atmosphere of our planet, they produce phenomena such as the aurorae.   In their journey through the interplanetary space, these particles are funelled by the solar magnetic field. Every

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Nanoflares and nanojets and the coronal heating problem. The paper: “Reconnection Nanojets in the Solar Corona” of P. Antolin (Northumbria University) appeared on Nature Astronomy

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Solar corona is the outer atmosphere of our star. Extended for several solar radii, it is made of million degrees plasma, thus being hotter than the gas in the photosphere (about 5600 degrees). Several scientist have tried understanding the mechanism responsible for the heating of coronal plasma, but it is has been an open issue for decades. The most promising

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Pulsations in the solar corona. The study: “Large-amplitude quasi-periodic pulsations as evidence of impulsive heating in hot transient loop systems detected in the EUV with SDO/AIA” of F. Reale (UNIPA/INAF-OAPA) recently appeared on ApJ

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Solar corona is made of plasma at million degrees. The mechanism responsible for the heating of the corona, which is the outer part of the solar atmosphere, is still one of the unsolved problems of solar physics. For comparison, the plasma in the photosphere is on average at about 5600 degrees. It is widely accepted that the responsible for heating

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Impulsive heating of plasma in coronal loops. The study: “Impulsive coronal heating from large-scale magnetic rearrangements: from IRIS to SDO/AIA” of F. Reale (UNIPA/OAPA) recently appeared on ApJ

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The Solar corona is visible in the energetic bands of the electromagnetic spectrum as composed by magnetic arcs filled by plasma at million degrees, which are particularly bright in the active regions. Despite it is clear that the magnetic field plays a fundamental role in heating and confining the plasma, the Solar corona is still a complex region where energetic

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Luglio 2017, la ricerca in evidenza: il Sole, un laboratorio unico per la fisica del plasma

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di Mario Giuseppe Guarcello    ( segui mguarce)     Solido, liquido e gassoso….questi sono gli stati della materia a cui siamo abituati sulla Terra. Nell’Universo non è esattamente cosi’. Il 99% della materia conosciuta (ed osservabile) nell’Universo infatti si trova sotto forma di plasma, uno stato che sulla Terra si trova naturalmente nei fulmini o nelle aurore boreali.   Cosa

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Febbraio 2017, la ricerca in evidenza: La pioggia solare e la turbolenta realtà delle stelle giovani

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I ricercatori dell’Osservatorio Astronomico di Palermo stanno studiando i fenomeni che caratterizzano le stelle giovani, con pochi milioni di anni di vita, osservando ciò che accade nel nostro “vecchio” (5 miliardi di anni) Sole.   Lo studio del Sole e delle stelle giovani sono da tempo due pilastri portanti dell’attività di ricerca dell’Osservatorio Astronomico di Palermo, due realtà quasi indipendenti

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