The circularly polarized sun at 12.6 CM wavelength

Details The circularly polarized sun at 12.6 CM wavelength The circularly polarized sun at 12.6 CM wavelength

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983tuft.reptq....l&link_type=abstract

Interim Report Tufts Univ., Medford, MA. Dept. of Physics.

Physics

Circular Polarization, Maps, Solar Activity, Solar Radio Emission, High Temperature Plasmas, Hot Electrons, Photosphere, Solar Corona, Solar Magnetic Field

Scientific paper

Circular polarization maps of the Sun with 45 sec angular resolution at 12 cm wavelength are presented for six continuous days. The maps have degrees of circular polarization up to pc = 20%, and they show an excellent correlation with photo-static magnetograms. A similar correlation exists at 6 cm and 20 cm, and at all three wavelentghs the brightness temperatures, TB, of the circularly polarized emission is TB approx 1,000,000 K. This suggests that the emission at all three wavelengths is due to the same hot plasma radiating in the presence of magnetic fields that project radially upwards from the photosphere into the low solar corona. At 6 cm wavelength highly circularly polarized (pc appprox 50%), core sources with angular sizes 0 approx 10 sec to 30 sec occur near sunspots. These core sources are due to gyroesonant emission at the third harmonic of the gyrofrequency, implying longitudinal magnetic field strengths of Hl approx 580 spots, gauss at altitudes h approx 3 x 10 to the ninth power cm above the sunspots. In regions near sunspots, the circularly polarized emission at 6 cm, 12 cm and 20 cm could all be due to the gyroemission of hot electrons spiralling in magnetic fields of strength Hl approx 280 gauss and Hl approc 170 guass are inferred from the 12 cm and 20 cm data, respectively. An alternative explanations is polarization by bremsstrahlung propagating in magnetic fields of strength Hl approx 100 guass and 50 gauss, respectively.

Affiliated with

Also associated with

No associations

Rating

The circularly polarized sun at 12.6 CM wavelength 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 The circularly polarized sun at 12.6 CM wavelength, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The circularly polarized sun at 12.6 CM wavelength will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1509558