G4JVF VLF receiving NAA on 24 kHz
W4HBK grabber on 10m receiving G0PKT
W5COV receiving WWVB
This is a comparison of the exact timing of the onset of the SID as seen by the three observers.
|G4JVF VLF RX Receiving NAA in Maine|
|W4HBK 10m Grabber Receiving G0PKT|
|W5COV VLF RX receiving WWVB in Colorado|
For comparison here is the X-Ray flux measured by the GOES satellite:
|GOES X-Ray Flux for 06NOV13 SID|
Previously with SIDs I had gotten the impression that the QRSS method was more sensitive to the onset time than were other methods. But now that I have seen them together and put some numbers with onset features it looks like there is no significant difference.