# Relationship between group sunspot number and Wolf sunspot number - Astrophysics > Solar and Stellar Astrophysics

Relationship between group sunspot number and Wolf sunspot number - Astrophysics > Solar and Stellar Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Continuous wavelet transform and cross-wavelet transform have been used toinvestigate the phase periodicity and synchrony of the monthly mean Wolf$R {z}$ and group $R {g}$ sunspot numbers during the period of June 1795 toDecember 1995. The Schwabe cycle is the only one common period in Rg and Rz,but it is not well-defined in case of cycles 5-7 of Rg and in case of cycles 5and 6 of $R {z}$. In fact, the Schwabe period is slightly different in $R {g}$and $R {z}$ before cycle 12, but from cycle 12 onwards it is almost the samefor the two time series. Asynchrony of the two time series is more obviouslyseen in cycles 5 and 6 than in the following cycles, and usually more obviouslyseen around the maximum time of a cycle than during the rest of the cycle.$R {g}$ is found to fit $R {z}$ better in both amplitudes and peak epoch duringthe minimum time time of a solar cycle than during the maximum time of thecycle, which should be caused by their different definition, and around themaximum time of a cycle, $R {g}$ is usually less than $R {z}$. Asynchrony of$R {g}$ and $R {z}$ should somewhat agree with different sunspot cyclecharacteristics exhibited by themselves.

Author: ** Kejun Li, Hongfei Liang**

Source: https://arxiv.org/