Kasper, JC;
Klein, KG;
Lichko, E;
Huang, J;
Chen, CHK;
Badman, ST;
Bonnell, J;
... Zank, GP; + view all
(2021)
Parker Solar Probe Enters the Magnetically Dominated Solar Corona.
Physical Review Letters
, 127
(25)
, Article 255101. 10.1103/PhysRevLett.127.255101.
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Abstract
The high temperatures and strong magnetic fields of the solar corona form streams of solar wind that expand through the Solar System into interstellar space. At 09:33 UT on 28 April 2021 Parker Solar Probe entered the magnetized atmosphere of the Sun 13 million km above the photosphere, crossing below the Alfv´en critical surface for five hours into plasma in casual contact with the Sun with an Alfv´en Mach number of 0.79 and magnetic pressure dominating both ion and electron pressure. The spectrum of turbulence below the Alfv´en critical surface is reported. Magnetic mapping suggests the region was a steady flow emerging on rapidly expanding coronal magnetic field lines lying above a pseudostreamer. The sub-Alfv´enic nature of the flow may be due to suppressed magnetic reconnection at the base of the pseudostreamer, as evidenced by unusually low densities in this region and the magnetic mapping.
| Type: | Article |
|---|---|
| Title: | Parker Solar Probe Enters the Magnetically Dominated Solar Corona |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.127.255101 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.127.255101 |
| Language: | English |
| Additional information: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. |
| Keywords: | ALFVEN WAVES, ANGULAR-MOMENTUM, WIND, FIELD, SPEED, TRANSITION, TURBULENCE, DRIVEN, FLOWS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10141311 |
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