More than 40 years since they were launched, the Voyager spacecraft are still making discoveries.
In a new study, a team of physicists led by the University of Iowa, report the first detection of bursts of cosmic-ray electrons accelerated by shock waves originating from major eruptions on the sun. The detection, made by instruments onboard both the Voyager 1 and Voyager 2 spacecraft, occurred as the Voyagers continue their journey outward through interstellar space, making them the first craft to record this unique phenomenon in the realm between stars.
These newly detected electron bursts travel at nearly the speed of light, some 670 times faster than the shock waves that initially propelled them. The bursts were followed by plasma wave oscillations caused by lower-energy electrons arriving at the Voyagers’ instruments days later—and finally, in some cases, the shock wave itself as long as a month after that.
The shock waves emanated from coronal mass ejections, which are expulsions of hot gas and energy that move outward from the sun at about 1 million mph. Even at that speed, it takes more than a year for the shock waves to reach the Voyager spacecraft, which have travelled further from the sun (more than 14 billion miles and counting) than any other human-made object.
“What we see here, specifically, is a certain mechanism whereby when the shock wave first contacts the interstellar magnetic field lines passing through the spacecraft, it reflects and accelerates some of the cosmic ray electrons,” says Don Gurnett, professor emeritus in the Department of Physics and Astronomy and the study’s corresponding author. “We have identified through the cosmic ray instruments these are electrons that were reflected and accelerated by interstellar shocks propagating outward from energetic solar events at the sun. That is a new mechanism.”
The discovery could help physicists better understand the dynamics of shock waves and cosmic radiation that come from flare stars (which can vary in brightness briefly due to violent activity on their surface) and exploding stars. The physics of such phenomena would be important to consider when sending astronauts on extended lunar or Martian excursions, for instance, during which they would be exposed to concentrations of cosmic rays far exceeding what can be experienced on Earth.
The physicists believe these electrons in the interstellar medium are reflected off of a strengthened magnetic field at the edge of the shock wave and subsequently accelerated by the motion of the shock wave. The reflected electrons then spiral along interstellar magnetic field lines, gaining speed as the distance between them and the shock increases.
In a 2014 paper in the journal Astrophysical Letters, physicists J.R. Jokipii and Jozsef Kota described theoretically how ions reflected from shock waves could be accelerated along interstellar magnetic field lines. The current study looks at bursts of electrons detected by the Voyager spacecraft that are thought to be accelerated by a similar process.
“The idea that shock waves accelerate particles is not new,” Gurnett says. “It all has to do with how it works, the mechanism. And the fact we detected it in a new realm—the interstellar medium—which is much different than in the solar wind where similar processes have been observed. No one has seen it with an interstellar shock wave in a whole new pristine medium.”
The findings were published online in the Astronomical Journal, in a paper titled “A Foreshock Model for Interstellar Shocks of Solar Origin: Voyager 1 and 2 Observations.”
Source: University of Iowa