We’re currently going through a solar minimum – a period where the sun tends to have less activity. Despite this, the sun has suddenly picked up intense activity over the last few days, baffling scientists.
Two massive sunspots are currently visible on the Sun’s surface, causing a lot of controversy and speculation among experts.
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The Conversation reports: The solar storms they’ve sent toward Earth may affect communications and other technologies like GPS and radio signals. They’re causing amazing displays of the northern and southern lights. And space weather scientists like us are excited because we wouldn’t normally expect this much activity from the sun at the moment.
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Decided the current huge sunspot regions were worthy of breaking out the old trusty Earth-ograph (Earth-ometer?) to viz their spatial scale pic.twitter.com/skI52TOTiT
— Karl Battams (@SungrazerComets) September 5, 2017
The sun goes through 11-year cycles of solar activity. What scientists call a solar maximum is the time in the cycle when the sun is putting out the most energy. That’s when we tend to see the most sunspots, solar flares and associated solar storms. Some solar maxima are larger or more active than others—such as the 1990 to 1991 solar max. But this last cycle, which peaked in 2014, was quite small, and there were few large geomagnetic storms.
We’re heading into the bottom of solar minimum, when the sun tends to have fewer sunspots, solar flares and coronal mass ejections—large expulsions of plasma, electrons and ions, and magnetic fields. But despite where we are in the sun’s cycle, activity on the sun has dramatically picked up over the past few days. On and off, these two sunspots have been flaring and shooting out coronal mass ejections, directed toward Earth.
So what’s going on with the sun? And should we be concerned about this somewhat out-of-character solar behavior?
Here’s what’s happened so far
On September 4, the sun started sputtering. A moderately large flare (classified as an M5.5) erupted at approximately 18:30 Coordinated Universal time (UTC). It produced a coronal mass ejection aimed at Earth.
The sun continued to flare on September 5. A solar energetic particle event from the previous day’s activity arrived at the Earth, where it likely affected radio communications as well as the health of satellite systems.
On September 6, the sun produced two massive X-Class flares. This is the category for the strongest of all solar flares. NASA announced one was the most powerful since at least 2008. It produced another coronal mass ejection.
Over the next day, the same sunspots continued to spit out more solar flares. It took about an hour for the solar energetic particles they emitted to arrive at Earth. These protons are incredibly fast-moving. They can affect communication systems, typically in the polar regions, where they are more likely to enter into the Earth’s atmosphere. As with all increases of radiation in space, they can also affect satellite systems and the health of astronauts.
Early in the morning hours of September 7 in the U.S., that first coronal mass ejection that erupted from the sun three days earlier arrived at Earth. Because of the way its magnetic field aligned with Earth’s, it generated only a small geomagnetic storm.
After being detected by spacecraft upstream from Earth in the solar wind, the massive coronal mass ejection from September 6 also hit Earth on the evening of September 7 EDT. Its arrival was a few hours earlier than space weather forecasting agencies around the world predicted.
What other effects will Earth see?
All this solar activity has already caused a couple of radiation storms in Earth’s high latitude regions that blacked out radio communication at certain frequencies. The impacts extended toward the equator and have affected high-frequency communications, including ham radios, which are used in emergency and disaster relief management. Radio fade-out maps from the Australian Bureau of Meteorology show that high-frequency radio communication disruptions have likely occurred in the same areas being pummeled by Hurricane Irma.
There has likely been a loss of global navigation system satellite communications in those same areas, but it will take time for the data to be analyzed and for us to gain a full understanding of how this space weather activity has affected those on the ground. The radiation storms may also force flights over the polar regions to reroute to avoid increased radiation exposures for people on board, and potential loss of communication and navigation systems for aircraft on these paths.
With the collision of the coronal mass ejection from this X-Class flare with Earth come other impacts for the near-Earth space environment. Geomagnetic storms, like the one currently in progress, are known to wreak havoc on a range of satellite and ground-based communication technologies, as well as power grids, GPS/GNSS, and orbit predictions of satellites and space debris. It is also very likely to produce dazzling aurora activity as far south as the northern U.S. and Europe in the Northern Hemisphere, and as far north as southern Australia and New Zealand in the Southern Hemisphere.
While scientists and aurora-hunting enthusiasts closely watch the storm’s ongoing effects, others will be bracing for problems and disruptions to the many technological services that will be affected.
We don’t need to worry about this coronal mass ejection being “the big one”—a solar storm direct hit that could cause widespread power blackouts and trigger as much as $2 trillion worth of damage, according to a National Academy of Sciences study. But this storm, on the back of this month’s abnormally active space weather, may wind up on the larger end of the scale, and will be the subject of lots of analysis and research.
We don’t yet fully understand everything that is happening. But the activity over the past few days, when the sun should be within its quietest period, shows that significant space weather events are possible at any stage of the 11-year solar cycle.
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