Sun_spot_num {astrodatR}

Sunspot numbers

Description

This dataset provides measurements of the number of sunspots, magnetic active regions, seen each month on the Sun from 1749 until May 2014. It shows the well-known 11-year solar magnetic cycle as well as other variations. The dataset is described in Appendix C.13 of Feigelson & Babu (2012) and is obtained from the Solar Physics research group at NASA's Marchall Space Flight Center solarscience.msfc.nasa.gov/SunspotCycle.shtml. The dataset has four columns: Year, Month, Monthly average sunspot number (SSN), and its standard deviation from the International Sunspot Number compiled by the Solar Influences Data Analysis Center in Belgium http://sidc.oma.be/. Users are encouraged to retrieve updated versions prior to study. The dataset is useful for the analysis of periodic and aperiodic time series.

Usage

Sun_spot_num

Format

A table containing 3185 rows and 4 columns.

Source

Feigelson and Babu (2012)

References

Feigelson, E. D. and Babu, G. J. (2012) Modern Statistical Methods for Astronomy with R Applications, Cambridge UK:Cambridge University Press