Sound Samples

Listed below are examples of radio phenomena that you may hear from the UFRO live feeds. Each compressed sound file are isolated clips from actual data recordings.  They can be heard with any MP3 player (i.e. WINAMP)

Jupiter and Galactic Background

Sample of the galactic background radiation, referred to as cosmic noise

COSMIC.MP3 (39s, 630k)

The links below gives a brief description of two types of Jovian emission, the L-bursts and the S-bursts. 

L-BURSTS.MP3 (97s, 1557k)

S-BURSTS.MP3(44s, 711k)

Solar Bursts
Our Sun also produces high energy radio storms that our receivers can detect. 

SOLAR.MP3 (129s, 2000k)


Sometimes, radio frequency "noise" makes it difficult to distinguish emissions from Jupiter from emissions produced by nearby sources. Both natural and artificial sources contribute to this interference.

Natural sources of interference include:

  • Lightning
Artificial sources of interference include:
  • Power generating and transforming facilities 
  • Ground-based radio transmitters


Types of Interference

Several types of interference are commonly heard during an observation. The following is a short list and description of some of the common types:

There are many kinds of stations, voice, telegraphic (Morse code), telex, sweeper (some are ionospheric sounding stations), CW or continuous wave (no modulation). Stations are narrow band; usually they disappear if one tunes a few
kHz away.

Lightning crashes. 
Local lightning crashes are usually strong. They last for a second or less. Under some circumstances, distant lightning crashes may sound like S bursts. Lightning crashes are wide band; they don't disappear by tuning the receiver.

It originates in coronal discharges from power lines and
insulators. It is wide band.

Usually generated from power line transient

Radio interference can also be heard from a variety of ground based sources. In this clip, natural and man-made interference can be recognized. Please click on this link to listen.