LA NASA SI ASPETTA L'INVERSIONE DEL CAMPO MAGNETICO DEL SOLE NEL
GIRO DI SETTIMANE
di: Tomas Jivanda
“Sembrerebbe che il nostro Sole si stia
preparando all'inversione del suo campo magnetico. Questo emerge da studi fatti
dalla Nasa che già nell'agosto di quest'anno ha lanciato
questa notizia dando come tempistica 3/4 mesi di tempo..ed ormai ci siamo!
Per buona pace dei veri "catastrofisti" questo evento
accade una volta ogni 11 anni attraverso un meccanismo interno del sole di cui
non si è ancora compresa appieno la genesi.
L'evento sarà seguito da vicino da ricercatori
Wilcox Solar Observatory della Stanford University, che monitora il campo
magnetico del sole quotidianamente.
Todd Hoeksema, direttore dell'Osservatorio di Wilcox Solar, ha
detto che il cambio di polarità è costruito lungo tutto il ciclo di
undici anni attraverso aree di intensa attività magnetica nota come le macchie solari
che si muovono gradualmente verso i poli, erodendo la polarità
esistente.
Alla fine, il campo magnetico si riduce a zero, per poi risalire
con la polarità opposta. "E 'un po' come una
marea in arrivo", ha detto Hoeksema. "Ogni piccola onda porta un pò
d'acqua e alla fine si arriva alla completa inversione."
ENGLISH
VERSION:
Sun will 'flip
upside down' within weeks, says Nasa
The sun’s magnetic field will reverse polarity at some point in the coming
weeks, sending ripples to the edge of interstellar space
By: TOMAS JIVANDA
The sun is set
to “flip upside down” within weeks as its magnetic field reverses polarity in an event that
will send ripple effects throughout the solar system.
Although it may
sound like a catastrophic occurrence, there’s no need to run for cover. The sun switches its polarity, flipping its
magnetic north and south, once every eleven years through an internal mechanism
about which little is understood.
The swap could
however cause intergalactic weather fronts such as geomagnetic storms, which
can interfere with satellites and cause radio blackouts.
Nasa said in
August that the change would happen in three to four months time, but it is
impossible to give a more specific date. Scientist won’t know for around another three weeks whether the flip is complete.
The impact of
the transfer will be widespread as the sun’s magnetic field exerts influence well beyond Pluto, past Nasa's Voyager
probes positioned near the edge of interstellar space.
The event will
be watched closely by researchers at Stanford University’s Wilcox Solar Observatory, which monitors the sun's magnetic field on a
daily basis.
Todd Hoeksema,
director of the Wilcox Solar Observatory, said the polarity change is built up
throughout the eleven year cycle through areas of intense magnetic activity
known as sunspots which gradually move towards the poles, eroding the existing polarity.
Eventually, the
magnetic field reduces to zero, before rebounding with the opposite polarity. “It's kind of like a tide coming in or going out,” Hoeksema said. “Each little wave brings a little
more water in, and eventually you get to the full reversal.”
One of the most
noticeable effect on Earth will be a boost in the occurrence, range and
visibility of auroras - the Northern Lights. “It’s not a catastrophic event, it’s a large scale event that has some real implications, but its not
something we need to worry about,” added
Hoeksema.
http://www.independent.co.uk/news/science/sun-will-flip-upside-down-within-weeks-says-nasa-8942769.html
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