Intro

The jump

    The 2 images show the dynamic spectra for 1 hour during the jump. the images have been scaled to +/- 5 sigma. The bandpass correction was taken from 4 minutes prior to the jump.

The plots show the total power vs time (.ps) (.pdf)

• Black is polA, red is polB
• Page 1: total power for full day and around the  jump;
  
• Top: total power vs time for the entire day.
  
• The purple lines show the region blown up in the lower plot.
  
• the total power was computed using 30 to 80 MHz (skipping some low freq rfi).
• The level changed by about 13% during the jump
• From about 13:30 to 19:30 the noise in polA is much larger than polB.
  
• Looking at the daily movie, this is occurring between 50 and 80 MHz in polA. PolB does not have much change.
• Mano thinks this is a type 4 stationary burst which can be polarized.
  
• Bottom: Blowup around the jump
• There is a bit of action while on the rising edge.
• the increase is about 13%
• about .5 hours in , polA jumps up a little and then back down below the orignal jump value.
• Page 2: total power during strongest burst.
  
• The strongest burst occurred at 16.42 (16:25).
• top: 15 minutes around burst.
  
• the 2 polarizations have equal power levels.
• the polA strength is about 30% of Tsys. polB is a little weaker.
  
• the (.jpeg) image shows the corresponding dynamic spectra for this burst.
• There are at least 3 weaker bursts during these 15 minutes.
• polB has a dropout around 16:17:30. You can also see this in the total power plot. The dropout does not occur in polA.
  
• there is a weak precursor prior to the large burst.
• The purple lines are blown up in the lower frame
• Bottom: Burst duration
• This shows how long the burst lasted..(about 20 seconds).

SUMMARY:

• The total power jumped by about 13% for 1 hour in both polA and polB. During the jump polA show a smaller jump.
• this is most likely an instability in our system. Looking at other Callisto spectrometers did not show any solar action during this period.
  
• The larger total power noise level in polA that lasted for 6 hours corresponded to spectral densit changes in 50 to 80 MHz. This may have been a type 4 stationary burst.
• The largest burst occurred at 16.42 and was about 30% of Tsys. It was unpolarized and lasted for about 20 seconds.
• the blowup around this burst also showed  a dropout in polB (with  no dropout in polA). Looking at the daily movie, you can see this happening in polB at other times.
  

processing: x101/220131/Callisto_jmp.pro

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