High Resolution Spectral Analyses ... , Krausche et al, 1976
For many years, the Scientists at the University of Florida relentlessly perfected their spectrographs and observed Jupiter.
I assume they followed the example of Jorma Riihimaa ( " A One Man Army
", Flagg 2000, Listening to Jupiter , a very good read ).
Meanwhile, I was helping to build the VLA in New Mexico, and had other problems to think about.
By 1976, after 5 years of observations, Krausche Flagg Lebo and Smith in their paper :
were able to report great progress with new instrumentation, capable of about 3 Khz and 0.3 millisecond resolution.
Their spectra show remarkable detail, notice the finely modulated L
emission a megahertz above the S emission, very well resolved by their
spectrograph.
At low resolution, one could call this an L burst , at high resolution an S burst .
Their analysis led to a new conception for L and S radiation:
"... in many cases L bursts are entirely composed of S or I bursts ..."
"... It may be true that L- and S-bursts are components of a single emission process... "
The careful analysis of S burst drift rates supported the model of
cyclotron emission, for decametric and decimetric radiation, and the emitting regions are sketched
in their figure 4 :
Note that at this time, their knowlege of the
Jovian magnetic field is very limited, based on measurements by the
Pioneer 11 spacecraft, with field intensities differing by as much as
40% in the decimetric region of emission. They choose a simple dipole
model for simplicity.
Very interesting paper.
Victor Herrero
http://herrero.10gbfreehost.com/
http://hubbleed.bravehost.com/
