Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...486.1058w&link_type=abstract
Astrophysical Journal v.486, p.1058
Astronomy and Astrophysics
Astronomy
2
Convection, Hydrodynamics, Sun: Activity, Sun: Interior, Sun: Oscillations, Sun: Rotation
Scientific paper
The 35 most exceptional, deep convective events that have occurred since the year 1750 are identified using Fj, an index of solar activity. The average event lasted 38 days and was followed by several years of lesser eruptions in a repeatable time sequence. This contradicts the common assumption that stellar convection is random. Deep convective events, which have lifetimes comparable to the stellar rotation period, will accumulate a net azimuthal motion relative to the ambient fluid. In the Sun, the rising portion of such an event moves in longitude ~1 deg day-1 as it partially conserves initial angular momentum. Its kinetic energy, ~1029 J, in azimuthal motion amounts to a pulse that is available to excite global oscillations (r-modes). Following the pulse, signatures of r-modes can be traced for 1000 days in the lesser solar eruptions, which is evidence that the r-modes are causing or modulating convection. A successful, nonlinear model of this is constructed in which magnetic fields play no role.
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