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Voyager 1 has entered a new region of space, sudden changes in cosmic rays indicate

Date:
March 20, 2013
Source:
American Geophysical Union
Summary:
Thirty-five years after its launch, Voyager 1 appears to have travelled beyond the influence of the Sun and exited the heliosphere, according to a new study.

The spacecraft Voyager 1 appears to have left the heliosphere, according to a new study.
Credit: NASA

Thirty-five years after its launch, Voyager 1 appears to have travelled beyond the influence of the Sun and exited the heliosphere, according to a new study appearing online today.

The heliosphere is a region of space dominated by the Sun and its wind of energetic particles, and which is thought to be enclosed, bubble-like, in the surrounding interstellar medium of gas and dust that pervades the Milky Way galaxy.

On August 25, 2012, NASA's Voyager 1 spacecraft measured drastic changes in radiation levels, more than 11 billion miles from the Sun. Anomalous cosmic rays, which are cosmic rays trapped in the outer heliosphere, all but vanished, dropping to less than 1 percent of previous amounts. At the same time, galactic cosmic rays -- cosmic radiation from outside of the solar system -- spiked to levels not seen since Voyager's launch, with intensities as much as twice previous levels.

The findings have been accepted for publication in Geophysical Research Letters, a journal of the American Geophysical Union.

"Within just a few days, the heliospheric intensity of trapped radiation decreased, and the cosmic ray intensity went up as you would expect if it exited the heliosphere," said Bill Webber, professor emeritus of astronomy at New Mexico State University in Las Cruces. He calls this transition boundary the "heliocliff."

In the GRL article, the authors state: "It appears that [Voyager 1] has exited the main solar modulation region, revealing [hydrogen] and [helium] spectra characteristic of those to be expected in the local interstellar medium."

However, Webber notes, scientists are continuing to debate whether Voyager 1 has reached interstellar space or entered a separate, undefined region beyond the solar system.

"It's outside the normal heliosphere, I would say that," Webber said. "We're in a new region. And everything we're measuring is different and exciting."

The work was funded by NASA's Jet Propulsion Laboratory in Pasadena, Calif.


Story Source:

The above story is based on materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Journal Reference:

  1. W.R. Webber, F.B. McDonald. Recent Voyager 1 data indicate that on August 25, 2012 at a distance of 121.7 AU from the Sun, sudden and unprecedented intensity changes were observed in anomalous and galactic cosmic rays. Geophysical Research Letters, 2013; DOI: 10.1002/grl.50383

Cite This Page:

American Geophysical Union. "Voyager 1 has entered a new region of space, sudden changes in cosmic rays indicate." ScienceDaily. ScienceDaily, 20 March 2013. <www.sciencedaily.com/releases/2013/03/130320134256.htm>.
American Geophysical Union. (2013, March 20). Voyager 1 has entered a new region of space, sudden changes in cosmic rays indicate. ScienceDaily. Retrieved August 21, 2014 from www.sciencedaily.com/releases/2013/03/130320134256.htm
American Geophysical Union. "Voyager 1 has entered a new region of space, sudden changes in cosmic rays indicate." ScienceDaily. www.sciencedaily.com/releases/2013/03/130320134256.htm (accessed August 21, 2014).

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