X-Ray Variability and Mass Outflows in Class I Protostar

Physics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

High Temperature Plasmas, Plasma Temperature, Thermal Plasmas, Magnetic Field Reconnection, Magnetic Islands, Magnetohydrodynamic Stability, Magnetohydrodynamics, Plasmas (Physics), Solar X-Rays, Tearing Modes (Plasmas), Current Sheets, Electrical Resistivity, Parallel Computers, Solar Corona, Solar Flares, Solar Magnetic Field, Protostars, Simulation

Scientific paper

Recent X-ray astronomical observations show that magnetohydrodynamic (MHD) view is of vital importance in understanding the dynamics of the X-ray emitting hot plasmas in the universe. Especially they show that magnetic reconnection plays a key role. The Solar X-ray satellite, Yohkoh, showed various evidences of magnetic reconnection in solar corona. Here we extend the magnetic reconnection model of solar flares to hard X-ray flares observed in star forming regions. We carried out 2.5-dimensional magnetohydrodynamic (MHD) simulations of the disk-star interaction. The closed magnetic loops connecting the central star and the disk are twisted by the rotation of the disk. In the presence of resistivity, magnetic reconnection takes place in the current sheet formed inside the expanding loops. Hot, outgoing plasmoid and post flare loops are formed as a result of the reconnection. Numerical results are consistent with the observed plasma temperature (107 - 108)K, the length of the flaring loop (1011 - 1012)cm, and the velocity of optical jets (200 - 400km/s). We showed by high-resolution numerical simulations using parallel computers that multiple magnetic islands are created in the current sheet due to the growth of the tearing mode instability. The magnetic islands are ejected quasi-periodically. the intermittent flaring activity continues so long as the disk matter twists the post-flare loops.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

X-Ray Variability and Mass Outflows in Class I Protostar does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with X-Ray Variability and Mass Outflows in Class I Protostar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-Ray Variability and Mass Outflows in Class I Protostar will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1538436

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.