Dependence of UV radiance of the quiet Sun on the solar cycle: Surface magnetic fields as the cause

Details Dependence of UV radiance of the quiet Sun on the solar cycle: Surface magnetic fields as the cause Dependence of UV radiance of the quiet Sun on the solar cycle: Surface magnetic fields as the cause

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...407..359p&link_type=abstract

Astronomy and Astrophysics, v.407, p.359-367 (2003)

Astronomy and Astrophysics

Astrophysics

10

Sun: Uv Radiation, Sun: Magnetic Field

Scientific paper

The quiet-Sun UV radiance depends on the solar cycle, as shown by data collected by the SUMER spectrograph on the Solar and Heliospheric Observatory (SOHO). The cause of this dependence is still unclear. Here the hypothesis is tested for the He I 584 Å line that these variations are due to changes in the magnetic network. The quiet-Sun variability is investigated with the two EUV instruments CDS (Coronal Diagnostic Spectrometer) and SUMER (Solar Ultraviolet Measurements of Emitted Radiation) and the MDI (Michelson Doppler Imager) magnetograph on SOHO. Using a monthly data set of co-spatial and co-temporal observations of quiet Sun areas near disk centre we follow the evolution of the quiet Sun over four years from solar cycle minimum to maximum conditions and find that the magnetic flux of the quiet network increases during this period. Furthermore, its variation is well correlated with the radiance change in the He I 584 Å line. Also, we find that the largest fractional change is in the flux of the strong network elements (largest average field strengths), while the weaker elements do not exhibit a significant change.

Affiliated with

Also associated with

No associations

Rating

Dependence of UV radiance of the quiet Sun on the solar cycle: Surface magnetic fields as the cause 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 Dependence of UV radiance of the quiet Sun on the solar cycle: Surface magnetic fields as the cause, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dependence of UV radiance of the quiet Sun on the solar cycle: Surface magnetic fields as the cause will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1662863