By Katrina Pascual, Tech Times
While they make for stunning images, solar flares could also disturb the atmospheric layer where GPS and communications signals travel.
NASA’s Solar Dynamics Observatory captured images of a mid-level solar flare at 8:29 p.m. EDT last April 17. A loop of solar material was seen emanating off the sun’s right limb.
An awe-inducing solar event,solar flares are potent bursts of energy radiating from the surface of the sun. Once these intense energy beams hit Earth, they can interact with the planetary magnetic field and atmosphere, producing lights at the north and south poles.
It is yet to be known exactly what causes these flares, but it has been proposed that the process of magnetic reconnection occurs and converts magnetic energy into light. This prevailing theory obtained evidence in the form of high-resolution images of an eruption in 2015, the most detailed image seen of the formation of these events.
This recent flare led to “moderate radio blackouts” during its peak. Such blackouts only take place during the course of a solar flare, which means they have already subsided and are no longer a cause for worry. They are also unlikely to have a major impact on the planet.
The Space Weather Prediction Center defines a radio blackout as the lack of capability to communicate on high-frequency bands in the 5 to 35 MHz spectral range. Lower frequency radio communications, though, may also be substantially affected during radio blackouts…..READ MORE
Given a legitimate need to protect Earth from the most intense forms of space weather – great bursts of electromagnetic energy and particles that can sometimes stream from the sun – some people worry that a gigantic “killer solar flare” could hurl enough energy to destroy Earth, but this is not actually possible.
Solar activity is indeed currently ramping up toward what is known as solar maximum, something that occurs approximately every 11 years. However, this same solar cycle has occurred over millennia so anyone over the age of 11 has already lived through such a solar maximum with no harm.
This is not to say that space weather can’t affect our planet. The explosive heat of a solar flare can’t make it all the way to our globe, but electromagnetic radiation and energetic particles certainly can. Solar flares can temporarily alter the upper atmosphere creating disruptions with signal transmission from, say, a GPS satellite to Earth causing it to be off by many yards. Another phenomenon produced by the sun could be even more disruptive. Known as a coronal mass ejection or CME these solar explosions propel bursts of particles and electromagnetic fluctuations into Earth’s atmosphere. Those fluctuations could induce electric fluctuations at ground level that could blow out transformers in power grids. A CME’s particles can also collide with crucial electronics onboard a satellite and disrupt its systems.
In an increasingly technological world, where almost everyone relies on cellphones, and GPS controls not just your in-car map system, but also airplane navigation and the extremely accurate clocks that govern financial transactions, space weather is a serious matter.
But it is a problem the same way hurricanes are a problem. One can protect oneself with advance information and proper precautions. During a hurricane watch, a homeowner can stay put … or he can seal up the house, turn off the electronics and get out of the way. Similarly, scientists at NASA and NOAA give warnings to electric companies, spacecraft operators and airline pilots before a CME comes to Earth so that these groups can take proper precautions.
NOAA’s Space Weather Prediction Center (http://swpc.noaa.gov) is the U.S. government’s official source for space weather forecasts, alerts, watches and warnings. Improving these predictive abilities the same way weather prediction has improved over the last few decades is one of the reasons NASA studies the sun and space weather. We can’t ignore space weather, but we can take appropriate measures to protect ourselves.
And, even at their worst, the sun’s flares are not physically capable of destroying Earth.
For more on X-class solar flares:
http://www.nasa.gov/mission_pages/sunearth/news/X-class-flares.html
For frequently asked questions on space weather:
http://www.nasa.gov/mission_pages/sunearth/spaceweather/index.html
Under a permanent agreement with the Australian Communications and Media Authority (ACMA) all Australian radio amateurs may use the alternative AX callsign prefix instead of VK on Australia Day, Saturday January 26. On Australia Day many c... Read more
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