Polar-cap and coronal-hole-associated brightenings of the Sun at millimeter wavelengths

Details Polar-cap and coronal-hole-associated brightenings of the Sun at millimeter wavelengths Polar-cap and coronal-hole-associated brightenings of the Sun at millimeter wavelengths

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sfcp.nasa..215k&link_type=abstract

In NASA. Marshall Space Flight Center Solar Flares and Coronal Physics Using P/OF as a Research Tool p 215-219 (SEE N86-24614

Physics

Mapping, Millimeter Waves, Polar Caps, Solar Corona, Atmospheric Attenuation, Root-Mean-Square Errors, Solar Limb

Scientific paper

Mapping observations of the Sun at millimeter wavelengths were made on 16 to 22 July 1984 with the 45-m telescope of the Nobeyama Radio Observatory. Seven 36-GHz (8.3-mm) maps and five 98-GHz (3.1-mm) maps were taken with half-power beam widths of 46 arc sec and 17 arc sec, respectively. Instead of the conventional rastering technique, a radial-scan method was adopted in which every scan passes through the disk center. Accordingly, the variation of the atmosphere attenuation due to changes in the weather conditions can be easily estimated and removed by using the brightness values at the disk center as calibration data. Also, the pointing errors of the telescope due to the high-speed scans can be corrected by using the solar limbs as position references. The rms residual errors in relative brightness and position after the corrections were estimated to be approx. 2% and approx. 5 arc sec respectively. To further reduce these errors, enabled us to make high-quality maps with with or approx. 1% uncertainty in brightness. Here and in the following, brightness is expressed in terms of the average brightness of the solar disk as a unit. Note that the brightness temperature of the quiet Sun is approx. 8000 K and approx. 6000 K at 36 GHz and 98 GHz, respectively.

Affiliated with

Also associated with

No associations

Rating

Polar-cap and coronal-hole-associated brightenings of the Sun at millimeter wavelengths 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 Polar-cap and coronal-hole-associated brightenings of the Sun at millimeter wavelengths, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polar-cap and coronal-hole-associated brightenings of the Sun at millimeter wavelengths will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1103877