Wednesday, August 25, 2010

Meteor Explosion

AUSTRALIA - Meteor explosion wows community. Many residents heard the loud rumble, and some were even lucky enough to see something in the sky, but simply everyone is talking about the supposed meteor that exploded over the Tombong area last Tuesday afternoon. A huge number of locals report having heard a loud unexplained “thundering” noise on Tuesday at around 2pm, while others tell of seeing a light falling through the sky at around the same time. No one got quite as close as a local Country Energy worker who was preparing to climb a power pole to make repairs. He suddenly noticed a light in the sky, which started traveling straight towards him in an east to west direction. He knew the bright object was traveling far too quickly to be an aircraft, and he watched in astonishment for over 20 seconds as it flew over the top of him, making a loud hissing or “swooshing” sound. He said the initially bright object dulled and broke up into four or five pieces, with a huge roar to be heard.
“Everything shook. I’ve never been in an earthquake, but it was that kind of a thing.”
Two reports had been registered on the Sydney Observatory ‘Lights in the Sky’ blog page that most likely related to the occurrence. The reports tell of sightings of a daytime meteor between 1.50pm and 2pm on the Tuesday. “A meteor bright enough to be seen during the day may well be sufficiently large to survive the journey through the atmosphere and become a meteorite on the ground. However, unless it was seen to land we are unlikely to ever find out.”

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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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