By: SPACE.com Staff 
 
 Published: 01/23/2012 04:42 PM EST on Space 
 
 
 
 An intense solar flare unleashed the biggest radiation storm in years today (Jan. 23), but astronauts aboard the International Space Station are not in any danger, NASA officials say. 
 
 
 
 The sun eruption triggered the most powerful radiation storm since 2005 in a wave of charged particles that is expected to hit our planet Tuesday (Jan. 24) at around 9 a.m. EST (1400 GMT), according to experts at the Space Weather Prediction Center, which is operated by the National Oceanic and Atmospheric Administration (NOAA). 
 
 
 
 NASA scientists also routinely monitor space weather conditions in order to protect astronauts and hardware in orbit from harmful radiation, and today's solar storm is no exception, agency officials said. 
 
 
 
 "The flight surgeons have reviewed the space weather forecasts for the flare and determined that there are no expected adverse effects or actions required to protect the on-orbit crew," NASA spokesman Kelly Humphries told SPACE.com. 
 
 
 
 The solar flare erupted this morning at 0359 GMT (which corresponds to late Sunday, Jan. 22 at 10:59 p.m. EST), triggering a solar explosion known as a coronal mass ejection that sent a stream of charged particles into space. When these charged particles hit Earth they stream down the planet's magnetic field lines to create so-called geomagnetic storms that can supercharge Earth's auroras (also known as the northern and southern lights). 
 
 
 
 But space weather can also have negative effects, such as interfering with power grids and communications infrastructure on Earth, and disrupting satellites and other spacecraft in orbit. 
 
 
 
 
 
 
 
 According to the skywatching site Spaceweather.com, today's coronal mass ejection "will deliver a strong glancing blow to Earth's magnetic field on Jan. 24-25 as it sails mostly north of our planet." 
 
 
 
 In response, NOAA's Space Weather Prediction Center has issued a geomagnetic storm watch, and the agency's deputy, Kathy Sullivan, said that polar flights are expected to be re-routed. 
 
 
 
 Editor's note: If you snap an amazing northern lights photo, or other skywatching image, and would like to share it for a possible story or gallery, please contact managing editor Tariq Malik at tmalik@space.com. 
 
 
 
 OurAmazingPlanet staff writer Brett Israel (@btisrael) contributed to this report from New Orleans, La. Follow SPACE.com for the latest in space science and exploration news on Twitter @Spacedotcom and on Facebook. ||||| A massive explosion on the sun's surface has triggered the largest solar radiation storm since 2005 and has unleashed a torrent of charged plasma particles toward Earth, though the threat to satellites, power grids and other high-tech hardware is believed to be manageable, scientists said.The National Oceanic and Atmospheric Administration detected a solar flare Sunday night that peaked at 7:59 p.m. Pacific time. NOAA satellites traced the bright flash of X-ray light to an area on the sun's surface known as region 1402 — the same area that had produced a weaker flare Thursday. A coronal mass ejection — which can hurl billions of tons of plasma up to 5 million mph — quickly followed.Radiation from the explosion arrived at Earth within hours of the flash, said Doug Biesecker, a physicist with NOAA's Space Weather Prediction Center in Boulder, Colo. A burst of charged plasma particles is expected to reach Earth by 6 a.m. Tuesday. That charged plasma is traveling uncommonly fast, making the 93-million-mile trip to Earth in about 34 hours, rather than taking two or more days, as is usually the case, Biesecker said.Sunday's radiation storm is the strongest since May 2005, when another happened that was perhaps 10% larger, Biesecker said. Based on the amount of radiation emitted, both storms measure about a three on a scale of one to five.While the plasma may cause otherworldly displays of light and color in some parts of the sky Tuesday night, the bombardment of energetic particles can wreak havoc on Earth — potentially downing GPS systems, wiping out power grids, destroying sensitive satellite equipment in orbit and exposing astronauts to fatal doses of radiation.As a precaution Monday, some flights were rerouted around polar regions, where the flash flood of charged plasma particles may interfere with navigation systems. Others flew at lower altitudes to reduce the risk of radiation exposure.Though it had been more than six years since the last storm of this magnitude, storms of this size are expected to become more frequent as a period of peak solar activity approaches in 2013."As we ramp up to the solar maximum next year, this sort of storm will become normal," Biesecker said.Scientists still don't know how to predict these solar events — which is a problem because they deliver a triple threat to technology on Earth, said Stanford solar astronomer Todd Hoeksema.X-rays traveling at the speed of light hit the Earth in about eight minutes. These can interfere with radio communications.A burst of radiation traveling at near-light speeds begins pelting Earth 20 minutes to an hour later. This radiation causes what are known as "single event upsets." Essentially, a high-energy proton traveling through a satellite can interfere with the charges in the silicon-based hardware, which can cause it to spit out spurious signals.The third and final attack comes from the burst of charged particles that affects Earth's magnetosphere, potentially interfering with airplane navigation systems. This particular worry is expected to force rerouting of some flights during the storm.These are not hypothetical fears, Biesecker said. For example, the infamous October 2003 " Halloween storm" took out Japan's ADEOS-II spacecraft, among other victims, causing the approximately $600-million satellite to fail less than a year after its launch."With all the technology of our advanced civilization, solar storms can have significant effects on communication, power, things like that," said UC Berkeley physicist Robert Lin. "The really big ones can have an enormous effect on space weather on the Earth."But most satellites built today should be relatively safe from mid-level storms such as the current one, said NOAA research scientist Juan Rodriguez. Modern satellites are built to withstand space weather as severe as a 1989 storm that caused a massive power outage in Canada's Quebec province.That said, those looking for a light show Tuesday night might be in for a treat. The aurora borealis probably won't be visible in Los Angeles, Rodriguez said, "but in Canada, maybe in the northern United States, it's a pretty amazing sight."
– A stream of charged plasma is headed toward Earth today, thanks to the biggest solar storm since 2005. The storm poses a small, manageable threat to satellites, power grids, and other high-tech hardware, and could cause some spectacular displays of light and color, the LA Times reports. The National Oceanic and Atmospheric Administration first detected the flare late Sunday, followed by a coronal mass ejection, which hurled billions of plasma particles toward Earth at uncommonly fast speeds. The first radiation from the flare hit Earth within hours, but the plasma is expected to arrive at about 9am today, potentially knocking out some GPS systems and power grids. Some flights were rerouted around polar regions yesterday as a precaution. Though such flares can expose astronauts to deadly radiation, NASA has indicated that this one won't, according to the Huffington Post. Of course, the fun part is that this might produce spectacular light displays tonight. A similar, weaker flare in the same part of the sun on Thursday produced such auroras this weekend, and you can see amazing photos of them here.