An overview of the radio observations during July 2021 is given.
The graphs show both the daily totals (Figure 1) and the hourly numbers (Figure 2) of “all” reflections counted automatically, and of manually counted “overdense” reflections, overdense reflections longer than 10 seconds and longer than 1 minute, as observed here at Kampenhout (BE) on the frequency of our VVS-beacon (49.99 MHz) during the month of July 2021.
The hourly numbers, for echoes shorter than 1 minute, are weighted averages derived from:
As usual, observations were sometimes complicated by unwanted interference, unidentified noise, and on 9 days, moderate to strong lightning activity. To minimize the effects of these disturbances as much as possible, the automatic counts were corrected manually.
The rather remarkable increase of mainly shorter overdense reflections on 21 July is possibly due to the phi Piscids and/or the kappa Perseids, but this should be confirmed.
14 reflections of more than 1 minute were observed during this month. A selection of others striking or strong reflections is also attached. (Figures 5 to 13).
If you are interested in the actual figures, or in plots showing the observations as related to the solar longitude (J2000) rather than to the calendar date, I can send you the underlying Excel files and/or plots. Please send me an e-mail; felix.verbelen at skynet.be.