Wednesday, August 10, 2011

ISS-Perseid Sky Show This Weekend

The Perseid meteor shower peaks this weekend, and the International Space Station is joining the show. Sky watchers in many US towns and cities are favored with ISS flybys on August 12-13 just when Perseid meteor activity is expected to crest under full moonlight.

FULL STORY at

http://science.nasa.gov/science-news/science-at-nasa/2011/09aug_perseids2011/

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The Perseid meteor shower peaks on Friday night August 12 and should produce good meteor scatter contacts on the Amateur Radio 50, 70 and 144 MHz bands.

Although the Moon may reduce the visual impact it won't affect the impact of the shower on radio propagation. The Perseids should still provide an abundance of Meteor trails which will reflect signals in the Amateur 50, 70 and 144 MHz bands allowing distances of up to 2,500 km to be worked.

About Meteor Scatter Propagation
http://www.jt6m.org/meteor-scatter.php

G7IZU Radio Reflection Detection Page
http://www.tvcomm.co.uk/radio/

WSJT Meteor Scatter Software
http://www.physics.princeton.edu/pulsar/K1JT/

Wired - Perseids
http://www.wired.com/wiredscience/2011/08/
perseid-meteor-shower/

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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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