Bipolar Magnetic Regions determined from Kitt Peak Vacuum Telescope Magnetograms

Citation and Acknowledgements Please cite both this database, the papers describing it, as well as adding the following acknowledgement: "Bipolar magnetic regions determined from KPVT full disk magnetograms were downloaded from the solar dynamo dataverse (https://dataverse.harvard.edu/dataverse/solardynamo), maintained by Andrés Muñoz-Jaramillo." Database citation format is shown at the top of this page, underneath the database title. It can be downloaded in a variety of formats directly from this page The papers describing this database are N. R. Sheeley, Jr., C. R. DeVore, and J. P. Boris, Simulations of the mean solar magnetic field during sunspot cycle 21, Solar Physics 98, 219, (1985). http://adsabs.harvard.edu/abs/1985SoPh...98..219S N. R. Sheeley, Jr. and Y-M Wang, Average properties of bipolar magnetic regions during sunspot cycle 21, Solar Physics 124, 81, (1989). http://adsabs.harvard.edu/abs/1989SoPh..124...81W Main Limitations The main limitations of these data are: Only the magnetic flux of the largest polarity is logged, assuming that the bipole is in perfect balance. The darkening of umbrae leads to an underestimation of the magnetic field strength by the KPVT-512. It is possible that flux is underestimated for the largest regions. Lower sensitivity is not constant during the survey so more small objects are logged towards the end than at the beginning. Description Bipolar Mangetic Regions (BMR) determined from Kitt Peak Vacuum Telescope (KPVT) Magnetograms. Detection of each BMR was performed manually by Neil Sheeley, Jr. using printed full disk magnetograms. Each BMR is identified uniquely from the moment of disk appearance to disappearance (either by decay, merging, or rotation). Returns after a full rotation are counted as new structures. Each of BMR is logged only once in the database at the point of maximum development. Columns are as follows: Date of maximum development. Hour of maximum development. Flux of leading polarity (1021 Mx). Latitude of leading polarity centroid. Longitude of leading polarity centroid. Latitude of trailing polarity centroid. Longitude of trailing polarity centroid.