Cool science: NASA Satellites Recreate Solar Eruption in 3-D

The more solar observatories, the merrier: Scientists have developed new models to see how shocks associated with coronal mass ejections, or CMEs, propagate from the Sun — an effort made possible only by combining data from three NASA satellites to produce a much more robust mapping of a CME than any one could do alone.

Much the way ships form bow waves as they move through water, CMEs set off interplanetary shocks when they erupt from the Sun at extreme speeds, propelling a wave of high-energy particles. These particles can spark space weather events around Earth, endangering spacecraft and astronauts.

Understanding a shock’s structure — particularly how it develops and accelerates — is key to predicting how it might disrupt near-Earth space. But without a vast array of sensors scattered through space, these things are impossible to measure directly. Instead, scientists rely upon models that use satellite observations of the CME to simulate the ensuing shock’s behavior.

The scientists — Ryun-Young Kwon, a solar physicist at George Mason University in Fairfax, Virginia, and Johns Hopkins University Applied Physics Laboratory, or APL, in Laurel, Maryland, and APL astrophysicist Angelos Vourlidas — pulled observations of two different eruptions from three spacecraft: ESA/NASA’s Solar and Heliospheric Observatory, or SOHO, and NASA’s twin Solar Terrestrial Relations Observatory, or STEREO, satellites. One CME erupted in March 2011 and the second, in February 2014.

The scientists fit the CME data to their models — one called the “croissant” model for the shape of nascent shocks, and the other the “ellipsoid” model for the shape of expanding shocks — to uncover the 3-D structure and trajectory of each CME and shock.

Each spacecraft’s observations alone weren’t sufficient to model the shocks. But with three sets of eyes on the eruption, each of them spaced nearly evenly around the Sun, the scientists could use their models to recreate a 3-D view. Their work confirmed long-held theoretical predictions of a strong shock near the CME nose and a weaker shock at the sides.

In time, shocks travel away from the Sun, and thanks to the 3-D information, the scientists could reconstruct their journey through space. The modeling helps scientists deduce important pieces of information for space weather forecasting — in this case, for the first time, the density of the plasma around the shock, in addition to the speed and strength of the energized particles. All of these factors are key to assessing the danger CMEs present to astronauts and spacecraft. Their results are summarized in a paper published in the Journal of Space Weather and Space Climate published on Feb. 13, 2018.

Advertisements

7 thoughts on “Cool science: NASA Satellites Recreate Solar Eruption in 3-D

  1. Very interesting article. I am curious to see how space organizations will mitigate CME exposure when we start branching out from low Earth orbit to explore places like Mars.

    • One of the most difficult issues we face in “manned” missions. One that has yet to be easily solved, mostly due to weight. Even the Apollo launches were predicated by solar activity. We looked for flares and new that a CME might be imminent (3 days away) so launch windows weren’t planned. Even then it was a period of relatively high solar activity.
      Currently the best candidates for radiation protection are good old water and interestingly, polyethylene. Unfortunately water is massive (weight is a relative term for space) so we minimize its needed volume with all sorts of recapture and recycling (the poo-pucks we oddly hang onto, while the Russians just jettison them). So, all we could afford long duration travelers, currently, are “safe bunkers” of limited volume where they could ride out a passing CME.

  2. Reminds me of the parable about the three blind men who encountered an elephant. Each felt only one part of the elephant (the trunk, the leg or tail). Only by discussing each’s impartial information could they better determine what they had encountered.

Comments are closed.