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24494

Re: Squigglies

Hello, I heard Squigglies this week on 14 MHz band in Portugal. I didn't heard stations from asia at this time. 73 from Thierry, F4EOB-CT2JTZ. [Non-text
thierry alves
9:57 AM
#24494
 
24493

ALERT: Geomagnetic K-index of 6 (G2)

Space Weather Message Code: ALTK06 Serial Number: 358 Issue Time: 2015 Aug 28 2101 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2015 Aug 28 2059 UTC
SWPC Product Subscription Service
Aug 28
#24493
 
24492

ALERT: Geomagnetic K-index of 6 (G2)

Space Weather Message Code: ALTK06 Serial Number: 357 Issue Time: 2015 Aug 28 0306 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2015 Aug 28 0259 UTC
SWPC Product Subscription Service
Aug 27
#24492
 
24491

ALERT: Geomagnetic K-index of 6 (G2)

Space Weather Message Code: ALTK06 Serial Number: 356 Issue Time: 2015 Aug 27 2351 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2015 Aug 27 2350 UTC
SWPC Product Subscription Service
Aug 27
#24491
 
24490

ALERT: Geomagnetic K-index of 6 (G2)

Space Weather Message Code: ALTK06 Serial Number: 355 Issue Time: 2015 Aug 27 0903 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2015 Aug 27 0859 UTC
SWPC Product Subscription Service
Aug 27
#24490
 
24489

ALERT: Geomagnetic K-index of 6 (G2)

Space Weather Message Code: ALTK06 Serial Number: 354 Issue Time: 2015 Aug 27 0340 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2015 Aug 27 0339 UTC
SWPC Product Subscription Service
Aug 26
#24489
 
24488

Re: Do Whistlers Contain a Doppler Shift?

Unfortunately no. You'd have to measure the full Poynting vector. The remaining 180 degree ambiguity probably wouldn't be a problem with the ground below you.
Gallagher, Dennis L. (MSFC-ZP10)
Aug 26
#24488
 
24487

Re: Do Whistlers Contain a Doppler Shift?

"accomplished via the 500 Hz Doppler shift carried on the radio signal along with a triangle or square pattern of mounted antennas." There's no Doppler shift
Facility 406 DM09
Aug 25
#24487
 
24486

Re: ALERT: Geomagnetic K-index of 6 (G2)

Check this out:Through the lens CONAIR940  . On Monday, August 17, 2015 11:04 AM, "Paul paul@... [VLF_Group]"
conair
Aug 25
#24486
 
24485

Do Whistlers Contain a Doppler Shift?

I am curious if anyone knows whether whistlers exhibit Doppler shift? Direction finding of man-made radio signals can be accomplished via the 500 Hz Doppler
Shawn
Aug 25
#24485
 
24484

SUMMARY: X-Ray Event exceeded M5 (R2)

Space Weather Message Code: SUMXM5 Serial Number: 140 Issue Time: 2015 Aug 24 0837 UTC SUMMARY: X-ray Event exceeded M5 Begin Time: 2015 Aug 24 0726 UTC
SWPC Product Subscription Service
Aug 24
#24484
 
24483

Re: Getting back into VLF

Myron, be sure to bypass all of your receiver power lines. Also a good hi Q series LC tuned to the AM station in your antenna input will do wonders. When I
w9ifz
Aug 23
#24483
 
24482

ALERT: Geomagnetic K-index of 6 (G2)

Space Weather Message Code: ALTK06 Serial Number: 353 Issue Time: 2015 Aug 23 0901 UTC ALERT: Geomagnetic K-index of 6 Threshold Reached: 2015 Aug 23 0859 UTC
SWPC Product Subscription Service
Aug 23
#24482
 
24481

Getting back into VLF

After being away from trying to monitor VLF (small children take priority) I'm ready to try to get back into it. I was in this group before and had a question
myronpw
Aug 22
#24481
 
24480

Re: VLF Experiment, Overloading of Soundcard Inputs.........

... Why not use a logarithmic amplifier? It can handle signals with a large dynamic range. Or a clamping circuit like an OpAmp with a couple of back-to-back
Claudio Pozzi
Aug 22
#24480
 
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