An overview of the radio observations during June 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 June 2021.
The hourly numbers, for echoes shorter than 1 minute, are weighted averages derived from:
This month quite severe local interference or unidentified noise sometimes disturbed the registrations, while weak lightning activity was recorded on 3 days. Most of this unwanted interference was manually corrected before the automatic counting.
Local interference and unidentified noise were quite strong at times, and on 9 days lightning activity, at times making counts problematic, was detected.
This month was mainly dominated by the known daylight showers, in particular the Arietids (ARI), zeta Perseids (ZPE) and beta Taurids (BTA), but also other showers were quite active. (Figures 3, 4 and 5) Only 8 reflections of more than 1 minute were observed during this month, but the one that showed up on June 20th lasted here for more than 5 minutes (Figure 6) and was thereby the strongest reflection in many years!
A selection of others striking or strong reflections is also attached. (Figures 7 to 14).
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.