Regular reports of my grabber activity and that of others, plus information on QRSS software, hardware and technique that comes my way

Tuesday, July 10, 2012

Comparison of Two Solar Flares as Observed on QRSS Signals

The past two days there were M-Class Solar Flares the effects of which were observed on the Pensacola  QRSS grabber.  I present the data here just to document the effect as a starting point for further obversations.

The first two pictures are the grabber images and the last two the measured x-ray flux.

Figure 1.  08JUL12 Solar Flare on 30m

Figure 2.  09JUL12 Solar Flare on 20m
Figure 3.  08JUL12 X-Ray Flux Observed by GOES Satellites

Figure 4.  09JUL12 X-Ray Flux Observed by GOES Satellites

In the first event there was a rapid dropout of signal called a Sudden Ionospheric Disturbance (SID) but no noticable frequency shift.  The SID lasted about 20 minutes.  The X-Ray flux was 7x10^-5 W/m^2 and the Sun was almost directly over the skip point.  The transmitting stations were to the east of me at distances of about 300 miles/482 km.

In the second event there was only a modest drop in signal strength but a noticible upward shift in frequency indicating an upward movement of the reflecting layer.  As the signal began to recover there was a noticable broadening of the frequency with a return to normalcy after about 30 minutes.  The X-ray flux was 1x10^-5 W/m^2 or about 7 times weaker than the first event.  The Sun was low in the sky to the west relative to the skip point.  The transmitting station was 1164 miles/1872 km to the west of me.

It makes sense that the difference in the x-ray flux caused the difference in observed effect but at this point I just want to save the observations and numbers in a safe place for comparison to, hopefully, future observations.  We've seen these effects in the past but I haven't written down any numbers.

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