Role of observable nonlinearities in solar cycle modulation
نویسندگان
چکیده
Context. Two candidate mechanisms have recently been considered for the nonlinear modulation of solar cycle amplitudes. Tilt quenching (TQ) is a negative feedback between amplitude and mean tilt angle bipolar active regions relative to azimuthal direction; latitude (LQ) consists in positive correlation average emergence regions. Aims. Here we explore importance determining factors behind LQ TQ effects. Methods. The degree nonlinearity induced by TQ, their combination systematically probed grid surface flux transport (SFT) models. role also explored successful 2x2D dynamo model optimized reproduce statistical behaviour real cycles. Results. vs found correlate with ratio u 0 /{\eta} SFT grid, where meridional flow {\eta} diffusivity. An analytical interpretation this result given, further showing that main underlying parameter effectivity range {\lambda} R which turn determined equatorial divergence shown scale as C 1 +C 2 /{\lambda} . presence demonstrated dynamo, contributing an amount comparable TQ. For other models literature contribution covers broad from being insignificant dominant form feedback. On hand, effect (with usually assumed amplitude) never negligible.
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics
سال: 2022
ISSN: ['0004-6361', '1432-0746']
DOI: https://doi.org/10.1051/0004-6361/202142572