Unique Physics in Interstellar Space: Voyager Spacecraft Detect New Type of Solar Electron Burst

This artist’s concept shows one of NASA’s Voyager spacecraft entering interstellar space, or the space between stars. This region is dominated by plasma ejected by the death of giant stars millions of years ago. Hotter, sparser plasma fills the environment inside our solar bubble. Credit: NASA

Physicists report accelerated electrons linked with cosmic rays.

More than 40 years since they 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, thus making them the first craft to record this unique physics in the realm between stars.

These newly detected electron bursts are like an advanced guard accelerated along magnetic field lines in the interstellar medium; the electrons 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 Voyager spacecraft continue to make discoveries even as they travel through interstellar space. In a new study, University of Iowa physicists report on the Voyagers’ detection of cosmic ray electrons associated with eruptions from the sun — more than 14 billion miles away. Credit: NASA/JPL-Caltech

The shock waves emanated from coronal mass ejections, expulsions of hot gas and energy that move outward from the sun at about one million miles per hour. Even at those speeds, it takes more than a year for the shock waves to reach the Voyager spacecraft, which have traveled further from the sun (more than 14 billion miles and counting) than any 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 physics and astronomy at Iowa 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 underpinning 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 we experience 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.”

Reference: “A Foreshock Model for Interstellar Shocks of Solar Origin: Voyager 1 and 2 Observations” by D. A. Gurnett, W. S. Kurth, E. C. Stone, A. C. Cummings, B. Heikkila, N. Lal, S. M. Krimigis, R. B. Decker, N. F. Ness and L. F. Burlaga, 3 December 2020, The Astronomical Journal.
DOI: 10.3847/1538-3881/abc337

Co-authors include William Kurth from Iowa; Edward Stone and Alan Cummings from the California Institute of Technology; Bryant Heikkila, Nand Lal, and Leonard Burlaga from the NASA Goddard Space Flight Center; Stamatios Krimigis and Robert Decker from the Applied Physics Laboratory at Johns Hopkins University; and Norman Ness from the University of Delaware.

NASA funded the research.

AstronomyAstrophysicsNASAUniversity of IowaVoyager
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  • Sekar Vedaraman

    Interesting.

    One Possible explanation. However,the questions we are asking should be looking for other possible explanations as well. Some thoughts for consideratio.

    1. If electrons already travel at close to the speed of light and can be accelerated by shock waves ( whatever the cause and explanation of the mechanism proposed) by 640 timesat what speeds do they actually travel after the acceleration? Einstien Theory of Relativity at risk ? Is wrap speed travel in Interstellr space possible – like the film makers in Star Trek envisaged? What is the medium of Intersteller space? Are we sure that the solar rays we are detetcting are fromour own Sun or from another much bigger Star? Maybe the Briitish attempt underway to study our Sun can resolve some of the mysteries about the Sun? Both a Closelook and a look from afar and data gathered from both views may be required.

    We Control the speed and acceleration of Particles Including electrons in Huge devices we create (Cern) in Partice Physics using magnetic Fields, and accelerate the same and crash them against each other to see the outputs and explain the outputs. How about some matematical explanations and prediction technologies —-about likly outcomes of such experiments prior to and then post – experiment as well?.