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Young stars in the Classical T Tauri phase are characterized by complex and highly dynamical phenomena involving the stars, their circumstellar disks, mass accretion, and outflows. Quite unsurprisingly, high energy processes, as traced by, e.g., the X-ray emission, are affected or even driven by the interaction between these components. Because of the widely different characteristic temperatures of the involved physical

The question of what heats the million degrees solar corona has been debated for decades. One scenario proposed since the 80s has been a finely stranded corona where each strand is heated by a rapid pulse. Unfortunately, neither such fine structure has been resolved, nor direct or conclusive evidence has been found so far, e.g., extensive superhot plasma, nanoflaring activity,

Negli ultimi 10 anni e’ stata osservata emissione X da diversi getti protostellari: HH 154 e HH 2 nel 2000 , HH 80/81 nel 2002, DG Tau nel 2003,…. Il modello di getto espulso dalla stella progenitrice con velocita’ variabile nel tempo (getto pulsato) spiega l’emissione ottica ed X osservata come interazione tra blob espulsi in tempi diversi e con