The Sudden Ionospheric Disturbance (SID) Database lists all events identified in the AAVSO Solar Bulletin. These results are provided monthly by the worldwide network of SID observers in the AAVSO Solar Division. Individual results are correlated with other observers' reports and reduced to a list of events with high definiteness ratings.
Thanks to an excellent volunteer effort by Ilka Petermann, the AAVSO's Solar Observing Guide is now available in German.
Click here to get to download (free-of-charge)
If you would like to translate the Guide into your native language, please contact Sara at AAVSO HQ. In addition to this new German version, we also have a French translation and Italian and Spanish versions are in progress.
(There are translations of this manual into French, German, Greek, Italian, Portuguese, and Spanish available below.)
Thanks to a lot of hard work on the part of long-time sunspot observer Frank Dempsey and his team, the AAVSO is proud to announce the publication of a brand new observing manual designed to help introduce observers to the art and science of solar observing.
Click the link above to read more and download your copy - free of charge.
The term "sunspot" appears in the news, often in connection with stories on aurorae, electrical outages, and problems with orbiting satellites. But often these stories don't really explain what sunspots are and why they're of interest to us on Earth. So what are sunspots?
Here are a number of solar photographs obtained by AAVSO solar observers over many years. Thanks to all of the photographers for sharing their images with us!
Contributed by Tom Fleming (FLET)
Reports and observations submitted to the AAVSO use the following ratings for atmospheric turbulence (Seeing): Poor, Fair, Good and Excellent.
