Joy’s law and its features according to the data of three sunspot catalogs

This paper investigates the trend towards an increase in the tilt of sunspot groups with increasing latitude (Joy’s law) and the relationship between the features of this law and solar activity parameters. In addition to the known data of the Mount Wilson and Kodaikanal observatories, the analysis u...

Full description

Saved in:
Bibliographic Details
Published in:Geomagnetism and Aeronomy 2012-12, Vol.52 (8), p.999-1004
Main Author: Ivanov, V. G.
Format: Article
Language:English
Subjects:
Aeronomy
Data analysis
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Solar activity
Solar physics
Sun
Sunspots
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper investigates the trend towards an increase in the tilt of sunspot groups with increasing latitude (Joy’s law) and the relationship between the features of this law and solar activity parameters. In addition to the known data of the Mount Wilson and Kodaikanal observatories, the analysis uses the Pulkovo database of solar activity, which allows for the estimation of the reliability of the conclusions obtained by other authors from the first two catalogs. It is shown that Joy’s law is manifested in all three data series and has many features in common. In particular at latitudes above 25–30°, the tilt of sunspot groups is not linearly dependent on latitude and displays a slight decrease. However, some features of this law found previously in the data of the first two observatories (e.g., a decrease in its strength with an increase in the strength of the solar cycle) are not confirmed by our analysis.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793212080130