Detalles de publicación
PP 07049
Jets in coronal holes: Hinode observations and 3D computer modelling
(1) Instituto de Astrofisica de Canarias, Tenerife, Spain, fmi@iac.es; (2) Dept of Astrophysics, Fac of Physics, Univ La Laguna, Tenerife, Spain; (3) Niels Bohr Institute, University of Copenhagen, Denmark; kg@astro.ku.dk; (4) Space Science Division, Naval Research Laboratory, Washington, USA, iugarte@ssd5.nrl.navy.mil; (5) College of Science, George Mason University, Fairfax, USA
Recent observations of coronal hole areas with the XRT and EIS instruments
onboard the Hinode satellite have shown with unprecedented detail the
launching of fast, hot jets away from the solar surface. In some cases these
events coincide with episodes of flux emergence from beneath the
photosphere. In this letter we show results of a 3D numerical experiment of
flux emergence from the solar interior into a coronal hole and compare them
with simultaneous XRT and EIS observations of a jet-launching event that
accompanied the appearance of a bipolar region in MDI magnetograms. The
magnetic skeleton and topology that result in the experiment bear a strong
resemblance to linear force-fee extrapolations of the SOHO/MDI
magnetograms. A thin current sheet is formed at the boundary of the emerging
plasma. A jet is launched upward along the open reconnected field lines with
values of temperature, density and velocity in agreement with the XRT and EIS
observations. Below the jet, a split-vault structure results with two
chambers: a shrinking one containing the emerged field loops and a growing
one with loops produced by the reconnection. The ongoing reconnection leads
to a horizontal drift of the vault-and-jet structure. The timescales,
velocities, and other plasma properties in the experiment are consistent with
recent statistical studies of this type of events made with Hinode data.
onboard the Hinode satellite have shown with unprecedented detail the
launching of fast, hot jets away from the solar surface. In some cases these
events coincide with episodes of flux emergence from beneath the
photosphere. In this letter we show results of a 3D numerical experiment of
flux emergence from the solar interior into a coronal hole and compare them
with simultaneous XRT and EIS observations of a jet-launching event that
accompanied the appearance of a bipolar region in MDI magnetograms. The
magnetic skeleton and topology that result in the experiment bear a strong
resemblance to linear force-fee extrapolations of the SOHO/MDI
magnetograms. A thin current sheet is formed at the boundary of the emerging
plasma. A jet is launched upward along the open reconnected field lines with
values of temperature, density and velocity in agreement with the XRT and EIS
observations. Below the jet, a split-vault structure results with two
chambers: a shrinking one containing the emerged field loops and a growing
one with loops produced by the reconnection. The ongoing reconnection leads
to a horizontal drift of the vault-and-jet structure. The timescales,
velocities, and other plasma properties in the experiment are consistent with
recent statistical studies of this type of events made with Hinode data.