Modeling of the force-free magnetic field in the active region NOAA 7216 taking information on the coronal fields into account

Details Modeling of the force-free magnetic field in the active region NOAA 7216 taking information on the coronal fields into account Modeling of the force-free magnetic field in the active region NOAA 7216 taking information on the coronal fields into account

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997kfnt...13c..49a&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol. 13, p. 49

Astronomy and Astrophysics

Astronomy

Solar Activity, Force-Free Magnetic Fields, Solar Corona, Photosphere, Solar Magnetic Field, Astronomical Models, Current Density

Scientific paper

The method of calculating the linear force-free magnetic field in a bounded domain proposed by us earlier is applied here to AR NOAA 7216. The B(z) component of the photospheric field was used, with the available information on coronal magnetic fields employed as complementary data. It is shown that the coronal magnetic field of AR 7216 (4 July 1992, 00h30 TM UT, NI2, El7) was nonlinear force-free with positive alpha. The electric current density in the coronal loops decreases with height. The twisting of the coronal field (clockwise) is atypical for active regions in the northern hemisphere. The large-scale electric current system connecting the leader with the tail spots was very weak. Two necessary conditions for the growth of its energy were not fulfilled: the dominance (over the AR area) of the current helicity was virtually absent, and large-scale vortical motions around the main spots were not found. As a result, the increase of free magnetic energy in the corona appeared to be retarded. This can explain the low flare activity of this large active region.

Affiliated with

Also associated with

No associations

Rating

Modeling of the force-free magnetic field in the active region NOAA 7216 taking information on the coronal fields into account 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 Modeling of the force-free magnetic field in the active region NOAA 7216 taking information on the coronal fields into account, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modeling of the force-free magnetic field in the active region NOAA 7216 taking information on the coronal fields into account will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1476791