Trovare una spiegazione del fenomeno potrebbe essere difficile, a me basterebbe capire perche' c'e' quel ricorrente "accelerare", che mi sa tanto di un evento non impulsivo ma in qualche modo diluito. Anche una catapulta e' diluita, gia' mi suona meglio che una racchetta
.
http://smsc.cnes.fr/html-images/shm.htmCita:
Differences between the corona and the traditional magnetohydrodynamic model were highlighted. The anisotropic temperatures and depending on the particles species, indicate a role of the cyclotronic waves in the corona heating. Systematic flows to the top were identified from the lower part of the corona in the coronal holes, suggesting that the wind is accelerated from the lower part of the corona. The detailed parameters measurements of the coronal plasma show the importance of the kinetic processes in the heating and the fundamental role of the very low corona for the wind acceleration.
[...]
The systematic presence of nonthermal populations of particles in solar wind and explosive processes of particles acceleration in the corona was observed, sometimes with relativistic energies (reached of GeV in a few seconds at the maximum!). The concept of "quiet" solar atmosphere lost its significance to the profit of a dynamic vision at all the observable scales.
Riporta anche un'altro fenomeno che mancava all'appello, i plumes (quali altri fenomeni "espulsivi" accadono?)
Cita:
The observation of the polar regions of our star obtained by these probes unveilled strange objects called "polar plumes" whose structure is still poorly known, but which could play an important role in the solar wind acceleration. Until now, a controversy existed about the nature of these objects: are the plumes magnetic field tubes or alignment effects along the lign of sight? In fact, the results show that in fact the two kinds of structures can coexist.
Poi riporto
http://en.wikipedia.org/wiki/Solar_windCita:
The continuous stream of particles flowing outward from the Sun was first suggested by British astronomer Richard C. Carrington. In 1859, Carrington and Richard Hodgson independently made the first observation of what would later be called a solar flare. This is a sudden outburst of energy from the Sun's atmosphere. On the following day, a geomagnetic storm was observed, and Carrington suspected that there may be a connection. George Fitzgerald later suggested that matter was being regularly accelerated away from the Sun and was reaching the Earth after several days.[1]
E di nuovo... ma perche' scrivono accelerated away, che mi sa tanto di fenomeno non impulsivo... di fatto parlano di un flusso continuo, ecco perche' non mi sta molto in testa un evento impulsivo.
Per finire qui si parla di slingshot, che non e' molto impulsivo (no?)
http://www.wired.com/wiredscience/2007/ ... lasma-bur/Cita:
(CME), a burst of accelerated, charged particles or plasma from the Sun.
Sempre sto accelerated...
http://www.alessandrobemporad.name/publ ... E_2009.pdfQui parla di accelerated by the shock waves.
Mi viene da dire che i protoni superveloci sono quindi accelerati dai brillamenti (che hanno energie spaventose e forse non sono istantanei quindi l'accelerazione dura un po' di tempo, creando una zona di shock waves che accelerano quel che si trovano davanti, ma non sono "schegge dell'esplosione"), mentre per i CME bo... non ho letto bene, pero' si parla delle parti basse della bellissima corona.
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