Ah! Prima di dimenticarmi, eccovi la spiegazione ufficiale della Nasa (via Ray Alex) riguardo il fenomeno (avvenuto tra il 12 e il 13 marzo 2012):
The enormous triangular hole in the Sun's corona was captured earlier today by NASA's Solar Dynamics Observatory, seen above from the AIA 211 imaging assembly. This gap in the Sun’s atmosphere is allowing more charged solar particles to stream out into the Solar System… and toward Earth as well.da leggere in accoppiata con quella rilasciata da Mauro Masserotti a La Stampa.
Normally, loops of magnetic energy keep much of the Sun's outward flow of gas contained. Coronal holes are regions sometimes very large regions, such as the one witnessed today where the magnetic fields don't loop back onto the Sun but instead stream outwards, creating channels for solar material to escape.
The material constantly flowing outward is called the solar wind, which typically "blows" at around 250 miles (400 km) per second. When a coronal hole is present, though, the wind speed can double to nearly 500 miles (800 km) per second. Increased geomagnetic activity and even geomagnetic storms may occur once the solar wind reaches Earth, possibly within two to three days. The holes appear dark in SDO images because they are cooler than the rest of the corona, which is extremely hot around 1,000,000 C (1,800,000 F)
Ad ogni modo, su tutta la vicenda, questo credo che sia il tweet migliore di tutti: P.S.: che dite se si usa l'hashtag #lascienzahasemprerallentatoilfuturo per diffondere, invece, foto e link riguardanti tutto quello che della scienza riteniamo importante per questo presente?
Mioddio! MIODDIO!
RispondiEliminaAiuto.