Friday, November 8, 2013

Super Typhoon Haiyan

The Super Typhoon Haiyan has affected the Philippines, triggering flooding, destroying buildings and causing millions of people to take shelter.
Ramon Anquilan DU1UGZ of the Philippines Amateur Radio Association (PARA) reports that the typhoon made landfall at about 4.40am local time today in Guian Estern Samar, about 600 kilometers southeast of Manila, and neighboring provinces are affected.
Then it made second landfall over Dulag-Tolosa, Leyte with maximum sustained winds of 235 kilometers per hour near the center and gusting up to 275 kph.
Sadly the area of Bohol and Cebu, which suffered from the 7.2 magnitude earthquake in October, are also along the typhoon's path. Bohol was the epicenter of the earthquake that killed 222 people, where at least 5,000 survivors still living in tents.
There is no power in many areas including Masbate, Ticao Island, Southern Sorsogon, Romblon, Northern Samar, Eastern Samar, Samar, Leyte, Southern Leyte, Biliran, Northern Cebu, Cebu City, Bantayan, Camotes Islands, Northern Negros Occidental, Capiz, Aklan, Antique, Iloilo, Guimaras and Dinagat Province.
Ramon DU1UGZ said, "HERO (Ham Emergency Radio Operator) have reported that those along the typhoon path have shut down their radios as they wait out for it to pass. In a few hours, we feel we should be hearing them again."
Already there have been some 270 postings of emergency traffic. More reports are expected. Earlier PARA called for the frequencies of 7.095 and 144.740 to be kept clear for emergency traffic.
Typhoon Haiyan, the world's strongest this year, and some reports make it potentially one of the most intense recorded.
The Philippines is battered by an average of 20 major storms or typhoons each year. Typhoon Bopha left about 2,000 people dead or missing on Mindanao Island in December 2012.
Jim Linton VK3PC
 Chairman IARU Region 3 Disaster Communications Committee
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My Stamp Collecting Blog

My Stamp Collecting Blog

Counter Added January 1, 2011

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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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