LONGTERM CHANGES OF SOLAR ACTIVITY ASYMMETRY

Long-term changes in the North--South asymmetry of solar activity

Letter to the Editor Longterm prediction of solar activity using Moscow Neutron Monitor Pressure-Corrected Values

In this paper, we use a function similar to the Planck function to reproduce the Moscow Neutron Monitor PressureCorrected Values of the time January 1958 to December 1998 and then give the predicted values after the year 1998. This kind of the values is found to be anticorrelated with sunspot numbers at a very high level when the value series has a backward phase shift of 7 months. An attempt t...

Long-term changes in the north–south asymmetry of solar activity: a nonlinear dynamics characterization using visibility graphs

Solar activity is characterized by complex dynamics superimposed onto an almost periodic, approximately 11-year cycle. One of its main features is the presence of a marked, time-varying hemispheric asymmetry, the deeper reasons for which have not yet been completely uncovered. Traditionally, this asymmetry has been studied by considering amplitude and phase differences. Here, we use visibility ...

Auroral Changes During the Eighteenth and Nineteenth Centuries and Their Implications for the Solar Wind and the LongTerm Variation of Sunspot Activity

Both auroral and geomagnetic activity provide information from which the behavior of the magnetosphere and the solar wind can be inferred. Swedish auroral sightings during the eighteenth and nineteenth centuries show a remarkable pattern of changes in the latitudes at which the auroras were observed. Auroral reports from New England confirm that these variations were hemisphere-wide. The patter...

The statistical significance of the North - South asymmetry of solar activity revisited

Aims. Many studies of the North-South asymmetry of solar activity and its features have been performed. However, most of these studies do not consider whether or not the asymmetry of the time series under consideration is statistically significant. If the asymmetry is statistically insignificant, any study about its behavior is meaningless. Here, we discuss the difficulties found when trying to...