Solar X-rays: Solar Xray Status
Geomagnetic Field: Geomagnetic Field Status

dhs threat level

Report of Solar and Geophysical Activity

Sun, 10/19/2014 - 11:00pm
The Report and Forecast of Solar and Geophysical Activity is the primary daily report prepared by SEC. It provides a summary and analysis of solar and geomagnetic activity during the previous 24 hours as well as the most recent solar indices. It also provides a forecast of activity and indices for the next 3 days.

Small Antennas for High Frequencies

Sun, 10/19/2014 - 11:00pm
This is about Small Antenna types and their properties which can help choosing proper antenna for high-frequency wireless communications as: two-way radio, microwave short links, repeaters, radio beacons or wireless telemetry

Real time F2 Map

Sun, 10/19/2014 - 11:00pm
Global real time ionospheric foF2 map

160 m Propagation Prediction

Sun, 10/19/2014 - 11:00pm
160 Meter Radio Propagation Prediction Table

Radiowave Propagation Center

Sat, 10/18/2014 - 11:00pm
High frequecy and VHF radio propagation data, solar and geomagnetic real-time and historic data, sunspot activity reports, as well as forecasts. A comprehensive propagation resource compiled by Tomas Hood, editor of the propagation columns of CQ, CQ VHF, Popular Communications, and Monitoring Times magazines.

Solar Activity and 3-day Predictions

Sat, 10/18/2014 - 11:00pm
Prepared jointly by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center and the U.S. Air Force.

Understanding propagation numbers

Sat, 10/18/2014 - 11:00pm
Quick reference table on understanding A K SFI indexes and how can be translated in usable frequency opportunities

Long Path Propagation

Sat, 10/18/2014 - 11:00pm
Long path hf radio propagation is sometimes the best path to work dx, since the shortest path is not always the best path.

High Latitude Geomagnetic data

Fri, 10/17/2014 - 11:00pm
A dynamic collection of high latitude geomagnetic data from 12 Canadian observatories

Solar Terrestrial Activity Report

Fri, 10/17/2014 - 11:00pm
Solar data with current solar status, forecast and propagation report

Ionosphere Web Site

Thu, 10/16/2014 - 11:00pm
Ionospheric Data Archived at NGDC

VOACAP Online

Thu, 10/16/2014 - 11:00pm
Online professional-grade high-frequency (3-30 MHz) propagation predictions

IPS - HF Systems MUF maps and prediction charts

Thu, 10/16/2014 - 11:00pm
These pages provide general propagation advice for HF communicators. Information available includes inferred global propagation conditions, real time HF fadeout coverage charts, regional ionospheric vertical MUF maps and Hourly Area Prediction charts for Astralia and Asia, Europe and North America

Is HF propagation reciprocal

Wed, 10/15/2014 - 11:00pm
Some test circuits using the ACE-HF System Simulation & Visualization software, about reciprocal propagation on HF bands by NW7US

The DXrobot - Spots e-skip and aurora alerts

Wed, 10/15/2014 - 11:00pm
Automatic e-skip and aurora alerts via email or SMS, it sends also latest dxspots via email.

WM7D Solar Resources

Wed, 10/15/2014 - 11:00pm
Solar Flux reports, Current Alerts and Warnings from NOAA, 27 day forcast from NOAA, charts reflecting the past 7 years Solar cycle summary charts from NOAA

DF5AI Long delayes echoes

Tue, 10/14/2014 - 11:00pm
LDE articles and reports about long delayes radio echoes by DF5AI

NVIS Area

Tue, 10/14/2014 - 11:00pm
NVIS description at tactical-link.com

Geophysical Alert Message wwv.txt

Tue, 10/14/2014 - 11:00pm
Broadcast via WWV and WWVH at 18 and 45 minutes past the hour. This message is updated every 3 hours. Reports current Solar-terrestrial indinces, Solar Flux, A-index, K-Index, forecast for space weather storms. Prepared by the US Dept. of Commerce, NOAA, Space Environment Center

Waveguide basics tutorial

Mon, 10/13/2014 - 11:00pm
Summary, tutorial about the basics of what is a waveguide and the basic waveguide theory.