Sudden Ionospheric Disturbances (SID) Recorded During July 2001

The events listed above meet at least one of the following criteria

Reported in at least two observer reports Visually analyzed with definiteness rating = 5 Reported by overseas observers with high definiteness rating

Solar Events

July was a very slow month for SID Observers, especially as compared to some of the last few months of this year. There were 139 flares detected by the GOES-8 Satellite but as can be seen from the chart below many of these were lower B-Class flares. There were only 3 M-Class flares and no X-Class. This all resulted in few SIDs being detected. Only sixteen for that matter. Most were medium intensity events with an importance rating of 2 or 2+. We are starting to head down the path to Solar Minimum so months like this can be expected more and more as time goes on. Now is the time to get those high-Q capacitors and fine tune your receiving systems. There is a new Q&A section on the AAVSO web site in the SID section that contains some interesting material to this end. It was generated based on some questions by a potetial observer but I think brought up some good points that could be of help to even those of us who are already up and running. Check it out and see of any of the info can be of help to you.

• Back to July Solar Bulletin
• Sudden Ionospheric Disturbances Supplement