Abstract: An overview of the radio observations during August 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 August 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 7 days, moderate to strong lightning activity. On three of these days (August 7, 9 and 21), the discharges occurred in the immediate vicinity of the beacon, giving rise to series of short pulses that are difficult to distinguish from meteor reflections. In addition, a lot of solar eruptions were recorded during the last 6 days of the month, but these did not pose a problem in counting the meteors. To minimize the effects of these disturbances, the automatic counts were corrected manually.
The eye-catchers of the month were, of course, the Perseids, with many long-lasting reflections, as every year.
After a start-up period with increased activity in the first part of the month, the expected maximum came in the night of 12–13 August. The surprise, however, came on August 14th, with a massive eruption that exceeded the forecasted maximum, peaking here between 08h00m and 09h00m UT. Some screenshots of this eruption have been included in this report (Figures 3 to 12). If desired, the counts per 5 minutes are also available for August 14, 2021.
After the shower maximum, meteor activity declined very rapidly and remained quite low during the second half of the month, with however several long and strong reflections.
Over the entire month, 77 reflections longer than 1 minute were recorded here. A selection of others striking or strong reflections is also added in this report (Figures 12 to 28).
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.