Monday, February 18, 2013

U.S. Tornado Environment Browser

New:  A tornado environment browser for the contiguous United States is now available. A tornado environment—convective mode sample (2003-2011) displays statistical information of supercell-related convective parameters accompanied by smoothed tornadic convective mode climatology images. (Updated: January 22 2013)

source; http://www.spc.noaa.gov/exper/envbrowser/

ARISS has switched after experiencing issues w/Kenwood D700

ARISS has switched radios. After experiencing issues with the Kenwood D700 on two consecutive school contacts, Amateur Radio on the International Space Station operations have announced plans to use the Ericsson radio on the Columbus module for all contacts until problems with the D700 are resolved.

Frank Bauer, KA3HDO, is AMSAT's Vice President for Human Spaceflight Programs. He says that for some reason signals from the Service Module Kenwood D700 radio are much diminished. He notes that a recent contact with Israel had low audio levels. Another contact with the Hospital for Sick Children was even worse. Only one student was able to talk to Chris Hadfield before signals on the ground were lost even though the crew reports hearing the ground station well.

It should be noted that both these contacts were with made using telebridge stations which have above average gear. Also astro-ham Hadfield used the space stations IP Phone, immediately after the hospital radio contact and answered all the student's questions so that all was not lost. A later contact with a school in Japan using the Columbus Module Ericsson radio proved very successful. (ANS, ARISS)

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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