Gravitational energy, solar radius and solar cycle

Details Gravitational energy, solar radius and solar cycle Gravitational energy, solar radius and solar cycle

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477..209c&link_type=abstract

In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:

Physics

2

Maunder Minimum, Sunspot Activity, Gravitational Energy, Luminosity

Scientific paper

A self-consistent approach is used. From the change (1.2 W/m2) in the solar constant (1367 W/m2) during a solar cycle we deduced a relation between the change in solar radius ΔR and the depth d = (1-α)R in the convection zone where the expansion starts. A second relation is obtained by equating the gravitational energy required for the expansion and the decrease in luminosity during half a solar cycle. This yields values for ΔR ≍ 8 km, d ≍ 0.96R (super-granular region) and for the change in gravitational energy ΔE ≍ 1032J. Similar considerations are made for the Maunder Minimum yielding ΔR ≍ 60 km, d ≍ 0.94R and ΔE ≍ 1033J. There is some change, say 40 per cent, if we use a quadratic expansion instead of a linear one. Moreover this theory suits a qualitative explanation why the Sun expands during a minimum of the magnetic activity.

Affiliated with

Also associated with

No associations

Rating

Gravitational energy, solar radius and solar cycle 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 Gravitational energy, solar radius and solar cycle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gravitational energy, solar radius and solar cycle will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-780154