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

dhs threat level

NVIS Propagation maps

Mon, 09/15/2014 - 11:00pm
Maps and propagation indices

Near-Real-Time F2-Layer Critical Frequency Map

Mon, 09/15/2014 - 11:00pm
This map can be used to determine the frequencies that will always be returned to the Earth. Transmitted frequencies higher than the indicated contours (which are given in MHz) may penetrate the ionosphere, resulting in lost power to space. The map shows the radio auroral zones as green bands near the northern and southern poles.

HF Propagation Primer

Sun, 09/14/2014 - 11:00pm
Flash Movie describing HF (shortwave) radio propagation to beginners. Very helpful aid in understanding.

144MHz E-skip Alerts for North America

Sun, 09/14/2014 - 11:00pm
Automatic 144MHz E-skip Alerts for North America

Troposcatter propagation

Sun, 09/14/2014 - 11:00pm
Introduction to troposcatter or tropospheric scatter propagation using the troposphere

NOAA Kp Index Monitor

Sun, 09/14/2014 - 11:00pm
The Estimated 3-hour Planetary Kp-index plot

Solar Cycle 24

Sun, 09/14/2014 - 11:00pm
Current status, prediction, solar weather for the solar cycle 24 by VE3EN

IPS - HF Systems MUF maps and prediction charts

Sun, 09/14/2014 - 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

Current Optimal Frequency Charts

Sun, 09/14/2014 - 11:00pm
Optimal Working Frequencies (MHz) for High Frequency (HF) / Shortwave Radio. By region, updated monthy.

RK3AF Aurora pages

Sat, 09/13/2014 - 11:00pm
VHF, ms, aurora, es, photos, audio, link, soft and more.

Basics of Radio Wave Propagation

Sat, 09/13/2014 - 11:00pm
Exaustive introduction to radio wave propagation, includes a very detailed glossary on common propagation terms, composed by AE4TM.

Report of Solar and Geophysical Activity

Sat, 09/13/2014 - 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.

Near-Realtime MUF indicator

Sat, 09/13/2014 - 11:00pm
This is a highly informative map that can be used by amateur and professional radio communicators to determine maximum usable frequencies for any world-wide path at the indicated UTC (Zulu) time.

VHF Radio Aurora Research

Fri, 09/12/2014 - 11:00pm
Website dedicated to vhf radio aurora operations by KG0VL

NASA Sunspot Cycle Predictions

Fri, 09/12/2014 - 11:00pm
Nasa MSFC predictions on the behavior of current sunspot cycle.

Maunders Butterfly Diagram

Fri, 09/12/2014 - 11:00pm
How to understand when a new solar cycle starts. At the beginning of a new solar cycle, sunspots tend to form at high latitudes, but as the cycle reaches a maximum the spots form at lower latitudes.

Amateur Radio Propagation RSS (XML) Live Feed

Fri, 09/12/2014 - 11:00pm
Live space weather and propagation data, in RSS (XML) format.

H.F. F-Layer Propagation Predictions

Fri, 09/12/2014 - 11:00pm
Assembled from a prediction model written by VE5ZX/G0TZX, from parameters supplied by G4FKH

NOAA Dailiy Reports

Thu, 09/11/2014 - 11:00pm
Report of solar & geophysical activity

An introduction to HF Propagation

Thu, 09/11/2014 - 11:00pm
This article will help to unravel some of the mysteries as well as giving useful operating tips to maximize your chances of working that rare station by G4UCJ