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When the speed of the solar wind suddenly decreases, the embedded solar magnetic field simultaneously suddenly increases, Ness said. There are also characteristic increases in the fluctuations of the magnetic field on either side of the termination shock.
On the Voyager 1 spacecraft, the instrument to measure the solar wind stopped working long ago so it was left to the sensitive dual magnetometers built 30 years ago at the Goddard Space Flight Center to reveal the existence of the termination shock. The measured magnetic field was observed to have suddenly increased by two-to-four times the average magnitude in the heliosphere, persuasively proving the crossing of the termination shock and entrance into the heliosheath, Ness said.
“I am going out with an exquisite result,” Ness said of his pending retirement and the scientific coup for Voyager 1. “The termination shock region is a plasma boundary we have been seeking for a very long time. It is like a Holy Grail of astrophysics. Estimating where it would be was a great challenge because there were no previous observations of such a phenomenon, and we had only theory to guide us. Finally, Voyager 1 has crossed it.”
On the Voyager 1 spacecraft, the instrument to measure the solar wind stopped working long ago so it was left to the sensitive dual magnetometers built 30 years ago at the Goddard Space Flight Center to reveal the existence of the termination shock. The measured magnetic field was observed to have suddenly increased by two-to-four times the average magnitude in the heliosphere, persuasively proving the crossing of the termination shock and entrance into the heliosheath, Ness said.
“I am going out with an exquisite result,” Ness said of his pending retirement and the scientific coup for Voyager 1. “The termination shock region is a plasma boundary we have been seeking for a very long time. It is like a Holy Grail of astrophysics. Estimating where it would be was a great challenge because there were no previous observations of such a phenomenon, and we had only theory to guide us. Finally, Voyager 1 has crossed it.”
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13TH ANNUAL INTERNATIONAL ASTROPHYSICS CONFERENCE: VOYAGER, IBEX, AND THE INTERSTELLAR MEDIUM (2015)
semanticscholar(2010)
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