Intro:

    there was a 1 week hf run starting on 02jun16 (more info). Data was taken with the echotek and the usrp systems. This page shows how the usrp data looked. It discusses some of the ways to process the hf data (with enhanced plasma line) that is not normally with non heater plasma line data.

10 second spectral integrations

What is seen:

• spreading of enhanced plasma line, ion line in freq and height for:
• .1 sec hf  on during 10 sec integration
• 10 sec hf on during 10 sec integration
• The effect of median filtering on the bandpass, enhanced lines..

The setup:

• No rfi removal was done when decoding (i was afraid it might affect the enhanced plasma line)
• Hf freq was 5.1 MHz, polarization: rcp
• 430 transmitter: clp, 2 usec baud, 440 usec rf pulse length, ipp=10ms.
• heights sampled at 1 usec
• 16384 length ffts.. 1.5 kHz resolution.
• Two data sets:
• set1: 02jun16 20:17:56 T2681 brett isham
  
• .1 sec hf on during 10 sec average
  
• average 20:17:56 to 20:18:06
• heater on 20:18:00 to 20:18:00.1    heater rf on for .1 sec
  
• set2: 02jun16 20:32:06 T681 brett isham
  
• hf on for entire 10 second integration.
  
• average 20:32:06 to 20:32:16
  
• heater on 20:32:00 to 23:32:30

.1 second hf on, 10 second integration:

• the heater came on for .1 seconds, 4 seconds after the start of the integration (it had been off for 59.9secs).
• A 71length median filter (100kHz) was used to remove a baseline on each spectra of the image.
  
• image range vs freq. image full scale -2 to +5 sigmas  (.gif)
• high sensitivity,  strong signals clipped
  
• image range vs freq. image full scale -2 to 100 sigmas (.gif)
• lower sensitivity, showing ion line, enhanced plasma line location. you can also see the rfi around 420 MHz.
  
• line plots of enhanced plasma line (.ps) (.pdf)
• Page 1: spectra of 230.90 km (max of  upshifted enhanced plasma line).
• The black lines are the spectra with no median filtering
• the green lines has a 71 length median filtered band pass removed from each spectra.
  
• top:25 MHz spectra. Normalized to median value for all heights. so scale is close to Tsys.
• 2nd Frame: Blowup of ion line
• dashed red line is 430 MHz
  
• 3rd frame: Blowup of upshifted enhanced plasma line
• red line is 430 + hfFreq (5.1 MHz)
  
• bottom Frame: blowup of downshifted enhanced plasma line
• red line is 430 - hfFreq
• Page 2: blowup in freq  ion and enhanced plasma lines. 230.90 km
  
• top: ion line
• middle: upshifted enhanced plasma line
• looks like two separate peaks. separated by about 70 kHz.
  
• bottom: downshifted enhanced plasma line
• Page 3: over plot spectra at heights close to 230.90 km
• these spectra have not been median filtered.
  
• Top: over plot spectra with offsets for display
• the max freq occurs at 231.42 km
• Bottom: over plot spectra with no offsets.
• shows relative strength of various heights.
• Page 4: over plot heights at freq channels around 435.09 MHz
• top: ranges 228  to 234 km for various freq channels (with offsets)
• bottom: ranges 228 to 234 Km with no offsets.
• Page 5: show the extent of range aliasing/clutter caused  by the code
• multiple freq channels plotted vs range
• Top: no median filtering of the spectra
• bottom: 71 length median filtered band pass removed from each spectra.
  

10 second hf on, 10 second integration

• The heater was on for 6 seconds prior to the start of the 10 second integration. It remained on for the 10 seconds..
  
• image range vs freq. image full scale -2 to +5 sigmas  (.gif)
• high sensitivity,  strong signals clipped
  
• image range vs freq. image full scale -2 to 1000 sigmas (.gif)
• lower sensitivity, showing ion line, enhanced plasma line location
• line plots of enhanced plasma line (.ps) (.pdf)
• Page 1: spectra of 237.95 km (max of  upshifted enhanced plasma line).
• The black lines are the spectra with no median filtering
• the green lines has a 71 length median filtered band pass removed from each spectra.
  
• top:25 MHz spectra. Normalized to median value for all heights. so scale is close to Tsys.
• 2nd Frame: Blowup of ion line
• dashed red line is 430 MHz
  
• 3rd frame: Blowup of upshifted enhanced plasma line
• red line is 430 + hfFreq (5.1 MHz)
  
• bottom Frame: blowup of downshifted enhanced plasma line
• red line is 430 - hfFreq
• Page 2: blowup in freq  ion and enhanced plasma lines. 237.95 km
  
• top: ion line
• middle: upshifted enhanced plasma line
• bottom: downshifted enhanced plasma line
• Page 3: over plot spectra at heights close to 237.95 km
• these spectra have not been median filtered.
  
• Top: over plot spectra with offsets for display
• the max line value occurs at 237.95km
• Bottom: over plot spectra with no offsets.
• shows relative strength of various heights.
• Page 4: over plot heights at freq channels around 435.09 MHz
• top: ranges 235 to 241  km for various freq channels (with offsets)
• bottom: ranges 235 to 241 Km with no offsets.
• Page 5: show the extent of range aliasing/clutter caused  by the code
• multiple freq channels plotted vs range
• Top: no median filtering of the spectra
• bottom: 71 length median filtered band pass removed from each spectra.
  

 
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