An overview of the radio observations during April 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 April 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.
As expected meteor activity remained relatively low in the first half of the month, but as from April 19th the Lyrids nicely showed up. As expected, they peaked on April 23rd, with quite numerous overdense reflections shorter than 1 minute.
During this month, 4 reflections longer than 1 minute were recorded. A selection of striking or strong reflections is attached. (Figures 3 to 8).
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.
Figure 1 – The daily totals of “all” reflections counted automatically, and of manually counted “overdense” reflections, as observed here at Kampenhout (BE) on the frequency of our VVS-beacon (49.99 MHz) during April 2021.
Figure 2 – The hourly numbers 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 April 2021.
Figure 3 – Meteor reflection 12 April 2021, 09h50m UT.
Figure 4 – Meteor reflection 14 April 2021, 04h50m UT.
Figure 5 – Meteor reflection 24 April 2021, 06h10m UT.
Figure 6 – Meteor reflection 27 April 2021, 10h25m UT.
Figure 7 – Meteor reflection 28 April 2021, 06h55m UT.
Figure 8 – Meteor reflection 30 April 2021, 06h35m UT.
