Back to the Home Page


Jupiter observations

My first observation of a Jupiter storm, May 30, 1979

The NICEro observatory started to monitor the Jovian storms back in 1979. At t that time a Yaesu FRG-7 receiver was used with a long wire antenna.
The strip-chart recorder was home-built with the electronics to drive the roll of paper and the pen and a pulse generator for time interval markers
(1 minute in this plot).
The signal was first recorded on tape, selected portions were then strip-charted. Of course no measurements could be performed with such a primitive
instrument but it triggered my curiosity for radioastronomy.
Many years elapsed since that day and I always feel the same thrill when hearing the first bursts of a Jupiter storm..I believe that scientific
curiosity does not exclude some kind of aesthetic pleasure when listening to the "Music of the Spheres"...

My last observation, August 23, 2009

   The following is the plot of  a seven minutes Io-C storm recorded on August 23, 2009 at the frequency
of 20.1 MHz using Radio-SkyPipe. The staircase steps are temperature calibrations using the RF-2020S  noise
The antenna is the two-elementsYagi.

this is the detailed bursts structure during one minute.
Click  here  for the audio

Look at the picture below, it shows in a bandwidth of 1 MHz, centered on 20.1 MHz, the RF spectrum received
by the PERSEUS receiver and displayed by the SpectraVue software. The frequency is on the vertical axis, time
goes from left to right, time stamps are shown every 2 minutes
The spectrum covers ca 13 minutes starting  at 00:41UT.
The vertical zones with different intensities correspond to the temperature calibration steps as shown above in the
SkyPipe plot. The "cloud" between 00:51 and 00:52 UT is the sequence of bursts shown in the plot, it covers a
bandwidth of ca 300 kHz. Other bursts can be seen at the beginning of the spectrum and just after the calibration steps.
The horizontal line is an interferring carrier at 20 MHz.


A document Jupiter Observations 2000 -2006  lists all the NICEro observations ( 54 observations) of Jovians storms since year 2000.
For each observation  the name of  the corresponding Radio-SkyPipe file (.spd) is shown together with the name of the audio file (if any)..
The Jovian source  (Io-A, Io-B or Io-C)  and the type of burst ( L-burst, S-burst or mixed burst) is also given.
A  picture of the .spd file is displayed and a snap shot of a selected sequence of bursts is also shown for each observation.
This is a sample :

The System III Central Meridian Longitude of Jupiter (CML III) and the Io Phase are given for the starting and ending time of each observation .
It shall be pointed out that the probability of detecting the emission depends on the values of the CML III and the Io Phase.
The following table shows the Jovian sources and the corresponding CML III /Io Phase values. (ref:  )

Source CML III Io Phase Characteristics of emission
Io related source
Io-A  200-290 195-265 Right Hand polarized, mostly L bursts
Io-B 90-200 75-105 Right Hand polarized, mostly S bursts
Io-C 290-10 225-250 Left Hand polarized, L and S bursts
Non-Io related sources
Starting in year 2000 all the Jovian  storms monitored at  the NICEro observatory have been archived (.spd and .wav files), some of them can
also be found in the NASA RadioJove archive

  Back to the Home Page