Different contributions to space weather and space climate from different big solar active regions

The purpose of this paper is to show that large active regions (ARs) with different magnetic configurations have different contributions to short-term and long-term variations of the Sun. As a case study, the complex $\delta$-type AR 12673 and the simple $\beta$-type AR 12674 are investigated in detail. Since the axial dipole moment at cycle minimum determines the amplitude of the subsequent cycle and space climate, we have assimilated the individual observed magnetic configurations of these two ARs into a surface flux transport model to compare their contributions to the axial dipole moment $D$. We find that AR 12673 has a significant effect on $D$ at the end of the cycle, making it weaker because of the abnormal and complicated magnetic polarities. An initial strongly positive $D$ ends up with a strongly negative value. The flare-poor AR 12674 has a greater contribution to the long-term axial dipole moment than the flare-rich AR 12673. We then carry out a statistical analysis of ARs larger than 800 $\mu$Hem from 1976 to 2017. We use the flare index FI and define an axial dipole moment index DI to quantify the effects of each AR on space weather and space climate, respectively. Whereas the FI has a strong dependence on the magnetic configuration, the DI shows no such dependence. The DI is mainly determined by the latitudinal location and the latitudinal separation of the positive and negative magnetic fluxes of the ARs. Simple ARs have the same possibility as complex ARs to produce big DI values affecting space climate.Comment: 18 pages, 8 figures, Accepted for publication in the Astrophysical Journa

Study of B^{0}_{s} \rightarrow \ TT(a_{2}(1320),K^{*}_{2}(1430),f_{2}(1270),f^{'}_{2}(1525)) in the perturbative QCD approach

In this work, we calculate the two-body decays B^{0}_{s} \rightarrow \ TT ( T denotes tensor mesons, a_{2}(1320), K^{*}_{2}(1430), f_{2}(1270), f^{'}_{2}(1525)) in the perturbative QCD approach. The predictions of branching rations, polarization fractions, and direct CP violations are given in detail. We find that: (a) For the pure annihilation decay, the longitudinal polarization is around 90.0\%, and the transverse polarizations are relatively small; (b) The direct CP asymmetry is proportional to the interference between the tree and penguin contributions. The direct CP asymmetry for most decays are small in this paper; (c) Here are only six kinds of Feynman diagrams for B^{0}_{s} \rightarrow \ TT, because the tensor mesons cannot be produced through the (V \pm A) currents or (S \pm P) density, the factorizable emission diagrams are prohibited, the nonfactorizable and annihilation contributions are important in these decay modes. The branching ratios of our calculation for B^{0}_{s} \rightarrow \ TT are at the order of 10^{-6} and 10^{-7}, which can be tested in the LHC-b and Belle II experiments; (d) Mixing exists for the f_{2}(1270)and f^{'}_{2}(1525), just as the \eta and \eta^{'} mixing, the branching ratios about the mixing angle \theta are given in this work. But it is different from f_{1}(1285)-f_{1}(1420), the mixing angle is very small, so the decay branching ratio only has little change.Comment: we have corrected some printing error