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Posted by Robert VA3ROM [ va3rom@gmail.com ] on August 16, 2022 at 12:28:51.
In Reply to: A Little Bit of SID posted by Robert, VA3ROM on August 16, 2022 at 12:20:25.
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Forgot to explain the attachments. NOAA SWC is the X-ray solar flux recorded by the NOAA Space Weather Center (SWC). It's the best way to confirm what you record by monitoring the high power military VLF transmitters NPM, NAA, NLK and NML (for North American SID monitors). The "shark fin" is the classic indicator of a SID. It can be either upright or inverted. In this case, I'm only 30 minutes east of NML and it is usually my best SID detector, but I also see that NPM in Oahu, HI also was affected slightly by the two solar flares that hit back to back over a couple of hours. The flares weren't that strong and only caused about an 8 dB and 5 dB shark fin peaks. NAA was in idle mode for it's usually Monday maintenance while NLK has been off-air for a while for some reason. 73
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