Saturday, March 2, 2013

LES 1

 Phil Williams, G3YPQ, is an Amateur Radio Astronomer in
North Cornwall in the U.K..  According to reports he
accidentally picked up the signal and after cross checking
with various lists, he identified it as LES 1.
 
LES 1 was built by the Massachusetts Institute of Technology
and launched in 1965. The satellite failed to reach its
intended orbit owing to a wiring error and has been drifting
out of control ever since.

Williams ran across it while monitoring near 237 MHz when he
noticed a signal with a peculiar signal drift caused by the
bird tumbling end over end every 4 seconds as the solar
panels became shadowed by the satellites engine.  Williams
said that gives the signal a particularly ghostly sound as
the voltage from the solar panels fluctuates.

The LES 1 satellite is about the size of a small car and is
not likely to re-enter the atmosphere for a long time as the
orbit is still relatively high.  It poses no threat other
than that caused by the thousands of other pieces of space
junk currently in orbit.  By now its likely that the on
board batteries have now disintegrated so its likely that
some other component failure has caused the transmitter to
start up when its in sunlight bringing the ghost satellite
back to life.

My Stamp Collecting Blog

Counter Added January 1, 2011

free counters

HOW TO READ PROPAGATION NUMBERS

The A index [ LOW is GOOD ]

  • 1 to 6 is BEST
  • 7 to 9 is OK
  • 11 or more is BAD

Represents the overall geomagnetic condition of the ionosphere ("Ap" if averaged from the Kp-Index) (an average of the eight 3-hour K-Indices) ('A' referring to amplitude) over a given 24 hour period, ranging (linearly) typically from 1-100 but theoretically up to 400.

A lower A-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Ap-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

SFI index [ HIGH is GOOD ]

  • 70 NOT GOOD
  • 80 GOOD
  • 90 BETTER
  • 100+ BEST

The measure of total radio emissions from the sun at 10.7cm (2800 MHz), on a scale of 60 (no sunspots) to 300, generally corresponding to the sunspot level, but being too low in energy to cause ionization, not related to the ionization level of the Ionosphere.

Higher Solar Flux generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; Solar Flux rarely affects the 30, 40, 60, 80, & 160 Meter Bands.

K index [ LOW is GOOD ]

  • 0 or 1 is BEST
  • 2 is OK
  • 3 or more is BAD
  • 5 is VERY VERY BAD

The overall geomagnetic condition of the ionosphere ("Kp" if averaged over the planet) over the past 3 hours, measured by 13 magnetometers between 46 & 63 degrees of latitude, and ranging quasi-logarithmically from 0-9. Designed to detect solar particle radiation by its magnetic effect. A higher K-index generally means worse HF conditions.

A lower K-Index generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands; a low & steady Kp-Index generally suggest good propagation on the 30, 40, 60, 80, & 160 Meter Bands.

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