Abstract: An overview of the radio observations during September 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 September 2021.
The hourly numbers, for echoes shorter than 1 minute, are weighted averages derived from:
Local interference and unidentified noise remained moderate during most of the month. On 4 days lightning activity was observed.
During this month no real eye-catching shower was active, but the activity remained quite interesting, showing both a number of minor showers and a fair number of long reflections.
Determining the radiant of minor showers on the basis of forward scatter isn’t strait forwards but nonetheless usually possible if several parameters are taken into account. Some of these are the time of greatest activity, the type of reflection (underdense vs. long lasting overdense), the approximate velocity derived from measurable head echoes and others. In the absence of suitable software, careful examination of all of these can be very time consuming and a challenge, but at the same time quite rewarding!
This month 13 reflections longer than 1 minute were observed here. A selection of others striking or strong reflections is also added in this report (Figures 3 to 11).
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.