By tramakers - Last updated: Sunday, February 23, 2020 - Save & Share - Leave a Comment

February 23, 2020. New Addition to the ALPO Publications Section Monographs

Researchers who follow the Sun’s Carrington Rotations will be interested to know that a new monograph by ALPO Solar Section Assistant Coordinator Theo Ramakers has been uploaded to the online ALPO Monographs folder.

Titled Solar Activity from 2014 through 2016 with the subtitle An unorthodox analysis of solar activity during three years, on the way to solar minimum, this nine-page paper documents the research done to evaluate the relationship between the Wolf number indicator used to identify solar activity in many amateur solar reports and the size of the areas which Active Regions occupy during times of high solar energy.”

Quoting further from the paper’s Abstract: “The evaluation period covered only a portion of solar cycle 24 and coincided with the beginning of the down-trend of solar activity going from solar maximum to solar minimum (January 4, 2014 to January 4, 2017). Indicators for high solar activity used in the analysis were solar flares which would trigger an R2 alert from the Space Weather Prediction Center (SWPC) and which were equal to or exceeded the flux of an M5.0 flare, thus including the upper M-class and X-class flares. The analysis did focus on the rapid increase these measurements have during the time leading up to major solar flares. The analysis included the mapping of the data obtained for both indicators for the day of the flare, as well as the three days prior to the flare. The result indicated that Active Region Areas of active regions are much more inclined to a rapid increase than the Wolf number in days prior to the flare.”

To access these documents, go to, then click on the ALPO Section Galleries link near the top right corner of the screen. Next click on the Publications Section folder, then the ALPO Monographs folder. You’ll then have access to all of the monographs.

Ken Poshedly
Member of the Board, Assn of Lunar & Planetary Observers
Coordinator, ALPO Publications Section
Atlanta, Georgia USA

Minor Planet “31836 Poshedly”