Observation and model calculations of sunspot ring structure at 8.46GHz

Details Observation and model calculations of sunspot ring structure at 8.46GHz Observation and model calculations of sunspot ring structure at 8.46GHz

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...316l..25g&link_type=abstract

Astronomy and Astrophysics, v.316, p.L25-L28

Astronomy and Astrophysics

Astrophysics

7

Solar Activity, Radio Emission, Magnetic Fields

Scientific paper

We present Very Large Array (VLA) observations of AR 7542 which demonstrate the existence of definite ring and horse-shoe structures of a sunspot in intensity (I) and polarization (V) at 8.46GHz (3.5cm wavelength) and compare them with model calculations of gyroresonance radiation. The VLA measurements have been made on three different days in July 1993 when AR 7542 was at three different longitudes which allows us to study the effect of viewing angle on sunspot-associated microwave emission. Model calculations of gyroresonance radiation have been carried out using a modified dipole model corresponding to the observed photospheric magnetic field strength and average temperature/electron density distributions consistent with soft X-ray and EUV observations (for the lower atmosphere) as well as theoretical assumptions (for the corona). The calculated I and V maps were found to be generally consistent with the radio observations. We obtain information on the magnetic scale length in vertical and horizontal directions above the sunspot and about the distribution of other plasma parameters (temperature, density) inside the radio source region.

Affiliated with

Also associated with

No associations

Rating

Observation and model calculations of sunspot ring structure at 8.46GHz 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 Observation and model calculations of sunspot ring structure at 8.46GHz, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observation and model calculations of sunspot ring structure at 8.46GHz will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-810291