We study the complexity of the supergranular network through fractal dimension by using the Ca II K digitized data archive obtained from the Kodaikanal Solar Observatory.The data consist of 326 visually selected super...We study the complexity of the supergranular network through fractal dimension by using the Ca II K digitized data archive obtained from the Kodaikanal Solar Observatory.The data consist of 326 visually selected supergranular cells spread across the 23rd solar cycle.Only cells that were well-defined were chosen for the analysis and we discuss the potential selection effect thereof,mainly that it favors cells of a smaller size(<20 Mm).Within this sample,we analyzed the fractal dimension of supergranules across the solar cycle and find that it is anticorrelated with the activity level.展开更多
We present findings from an analysis of the fractal dimension of solar supergranulation as a function of latitude,supergranular cell size and solar rotation, employing spectroheliographic data in the Ca II K line of s...We present findings from an analysis of the fractal dimension of solar supergranulation as a function of latitude,supergranular cell size and solar rotation, employing spectroheliographic data in the Ca II K line of solar cycle no.23. We find that the fractal dimension tends to decrease from about 1.37 at the equator to about 1 at 20° latitude in either hemisphere, suggesting that solar rotation rate has the effect of augmenting the irregularity of supergranular boundaries. Considering that supergranular cell size is directly correlated with fractal dimension, we conclude that the mechanism behind our observation is that solar rotation influences the cell outflow strength, and thereby cell size, with the latitude dependence of the supergranular fractal dimension being a consequence thereof.展开更多
文摘We study the complexity of the supergranular network through fractal dimension by using the Ca II K digitized data archive obtained from the Kodaikanal Solar Observatory.The data consist of 326 visually selected supergranular cells spread across the 23rd solar cycle.Only cells that were well-defined were chosen for the analysis and we discuss the potential selection effect thereof,mainly that it favors cells of a smaller size(<20 Mm).Within this sample,we analyzed the fractal dimension of supergranules across the solar cycle and find that it is anticorrelated with the activity level.
文摘We present findings from an analysis of the fractal dimension of solar supergranulation as a function of latitude,supergranular cell size and solar rotation, employing spectroheliographic data in the Ca II K line of solar cycle no.23. We find that the fractal dimension tends to decrease from about 1.37 at the equator to about 1 at 20° latitude in either hemisphere, suggesting that solar rotation rate has the effect of augmenting the irregularity of supergranular boundaries. Considering that supergranular cell size is directly correlated with fractal dimension, we conclude that the mechanism behind our observation is that solar rotation influences the cell outflow strength, and thereby cell size, with the latitude dependence of the supergranular fractal dimension being a consequence thereof.
