A laboratory experiment of magnetic reconnection: Outflows, heating, and waves in chromospheric jets

N. Nishizuka, Y. Hayashi, H. Tanabe, A. Kuwahata, Y. Kaminou, Y. Ono, M. Inomoto, T. Shimizu

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Hinode observations have revealed intermittent recurrent plasma ejections/jets in the chromosphere. These are interpreted as a result of non-perfectly anti-parallel magnetic reconnection, i.e., component reconnection, between a twisted magnetic flux tube and the pre-existing coronal/chromospheric magnetic field, though the fundamental physics of component reconnection is not revealed. In this paper, we experimentally reproduced the magnetic configuration and investigated the dynamics of plasma ejections, heating, and wave generation triggered by component reconnection in the chromosphere. We set plasma parameters as in the chromosphere (density 1014cm -3, temperature 5-10eV, i.e., (5-10) × 104K, and reconnection magnetic field 200G) using argon plasma. Our experiment shows bi-directional outflows with the speed of 5kms-1 at maximum, ion heating in the downstream area over 30eV, and magnetic fluctuations mainly at 5-10 μs period. We succeeded in qualitatively reproducing chromospheric jets, but quantitatively, we still have some differences between observations and experiments such as in jet velocity, total energy, and wave frequency. Some of them can be explained by the scale gap between solar and laboratory plasma, while the others are probably due to the difference in microscopy and macroscopy, collisionality, and the degree of ionization, which have not been achieved in our experiment.

Original languageEnglish
Article number152
JournalAstrophysical Journal
Volume756
Issue number2
DOIs
Publication statusPublished - 2012 Sep 10
Externally publishedYes

Keywords

  • magnetic fields
  • magnetic reconnection
  • methods: laboratory
  • plasmas
  • Sun: activity
  • Sun: chromosphere

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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