First, some details on Magnetic Portals or what S0 occasionally calls the 'Earth Footprint' referring to the Sun-Earth Variable Magnetic Connection.
Since 2008 NASA has asserted that every 8 minutes, "A magnetic portal will open, linking Earth to the Sun 93 million miles away. Tons of high-energy particles may flow through the opening before it closes again...It's called a flux transfer event or 'FTE.'"
The article also outlines how FTE's form:
"On the dayside of Earth (the side closest to the sun), Earth's magnetic field presses against the sun's magnetic field. Approximately every eight minutes, the two fields briefly merge or "reconnect," forming a portal through which particles can flow. The portal takes the form of a magnetic cylinder about as wide as Earth.
The European Space Agency's fleet of four Cluster spacecraft and NASA's five THEMIS probes have flown through and surrounded these cylinders, measuring their dimensions and sensing the particles that shoot through."
Below is a screenshot, link to a useful PDF on Solar Flares Earth changes:
The 8 minute variable connection:
July 7, 2012: X-Flare, Gamma Ray Burst
(0:43) Having a look at the Solar Wind: the 'yellow' is the speed jumping up and down around 500 km/s, which is too fast to be nothing. The 'orange' is the density and there is no continuity: together these suggest that many little CME's are hitting Earth, don't forget we've had a ton of M-Flares, we're up to 26 actually.
(1:01) Most of them have pumped out bits of ejecta, enough so that around 17:00 UTC yesterday the Solar Wind began breaking through our Magnetosphere; that's the 'red' spike.
(1:09) You can see the sudden onset of particle bombardment in our electrojet, here, on Ovation Prime. It actually caused a brief Geomagnetic Storm, but then, just as our shields were down, BOOM!
(1:19) An X-Class Solar Flare cooked our highest protective layers and made a visibly unimpressive, but scientifically significant impact. And even though the 'Earth Footprint' is not updated, I believe it was connected to that Sunspot because we developed a radiation storm almost immediately; we're still in it now.
The bit reported right before this excerpt is about LARGE Gamma Ray Burst, Cosmic Ray readings. These cosmic rays cluster around and form icy areas in the atmosphere, inducing cloud formation and coupling with CFC's to destroy Ozone.
On the videos on the right, July 8th and July 9th, 2012 we can see the effects of Space Weather events building up to the melting of Greenland's Ice Sheet by July 12th, 2012.
S0s Videos Before Greenland's Melt!
Some Coverage on the Rapid Extent of Greenland's Continental Ice Sheet Melt:
On July 9th, 2012 S0 discusses the Radiation Storms that had popped up and were subsiding. Flare activity continued.
NASA noticed this (image on the right) taking place in Greenland on July 8, 2013:
"Extent of surface melt over Greenland’s ice sheet on July 8 (left) and July 12 (right). Measurements from three satellites showed that on July 8, about 40 percent of the ice sheet had undergone thawing at or near the surface. In just a few days, the melting had dramatically accelerated and an estimated 97 percent of the ice sheet surface had thawed by July 12."
According to NASA's Article:
"The melting spread quickly. Melt maps derived from the three satellites showed that on July 8, about 40 percent of the ice sheet's surface had melted.
By July 12, 97% had melted. This extreme melt event coincided with an unusually strong ridge of warm air, or a heat dome, over Greenland. The ridge was one of a series that has dominated Greenland's weather since the end of May…
The latest heat dome started to move over Greenland on July 8, and then parked itself over the ice sheet about three days later. By July 16, it had begun to dissipate."
The strong ridges of warm air at the end of May were due to the flurry of M-Flares the Earth was receiving.
With frequent Radiation, Geomagnetic Storms and Earth's magnetic connectivity to various active regions and Flaring Sunspots it's clear what caused Greenland's Ice to melt so quickly.
The reason this took place over Greenland in the Summertime is outline in this article about 'Volcanoes and Ozone':
"The chemical reactions that destroy ozone speed up when particles like ice crystals are in the air, because the ice crystals provide a surface on which the reactions can occur. That is why an "ozone hole" appears over the Antarctic each winter. There are no more CFCs there than elsewhere, but there are more ice crystals: more tiny platforms on chemical reactions can take place."
Mix in the massive Cosmic Ray Event on July 6, 2013, since "cosmic rays control the electrical system of the atmosphere which in turn affects cloud microphysics and radiative transfer of the atmosphere. Both clouds and radiative transfer change the global temperature and thus affect climate change" and these events led to Record Arctic Ice Melt in August as well?
Video by NASA on Magnetic Portals around Earth:
"Portals form via the process of magnetic reconnection. Mingling lines of magnetic force from the Sun and Earth criss-cross and join to create openings.
These 'X-points' are the sudden joining of magnetic fields can propel jets of charged particles from the X-point, creating an 'electron diffusion region.'"
"Of particular importance is the sun's extreme ultraviolet (EUV) radiation, which peaks during the years around solar maximum. Within the relatively narrow band of EUV wavelengths, the sun’s output varies not by a minuscule 0.1%, but by whopping factors of 10 or more. This can strongly affect the chemistry and thermal structure of the upper atmosphere."