Amateur Radio Propagation Studies


Science, research, engineering, operating


The following list presents a number of selected webpages, online services and resources which may be helpful in radio propagation studies.

Acknowledgement: The author is grateful to the HAARP project, Leicester University, NOAA, Oulu University, Cornell University and the POES program for granting permission to use the following images and resources.


The Sun & the Earth's space environment
The magnetosphere, Aurora
The ionosphere
The neutral atmosphere, meteorology, synoptics
Remote sensing, geophysical radio observatories
Scientific institutes & organisations
Magazines, journals, online services

The success of the scientific enterprise can often blind us to the astonishing fact that science works. Although most people take it for granted, it is both incredibly fortunate and incredibly mysterious that we are able to fathom the workings of nature by the use of the scientific method.

Paul Davies


Sunspot Cycle predictions
Comment: Visit this page to understand solar cycle predictions and its scientific background.
Comment: Science news and information about the Sun-Earth environment including a gallery of attractive images.
Solar Terrestrial Activity Report
Comment: Sunspot numbers, solar flux and planetary A index.
Space Environment Center, NOAA
Comment: Excellent site providing links to many other webpages featuring real time information.
Today's Space Weather
Comment: H-alpha image of the sun, 3-day solar-geophysical forecast, solar x-ray flux and other types of information.
ACE (Advanced Composition Explorer)
Comment: Real time solar wind data from the ACE spacecraft which orbits the L1 Lagrange point, i.e. the point of Earth-Sun gravitational equilibrium about 1.5 million km from Earth and 148.5 million km from the Sun. (solar wind data)
Space Weather Now
Comment: Today's sun, animated solar wind data, POES auroral oval, active regions on the sun.
Windows of the Universe
Comment: The University Corporation for Atmospheric Research (UCAR) developed this "different" web site about Earth and space sciences.
Start page:
Space weather today:
Satellites and space weather:
Astronauts and space radiation:
Space storms and radio communication:
How does space weather affect pipelines?:
Electric power grids and space weather:



Current NOAA data, courtesy of N3KL solar monitor


August 11, 1999. (C) DF5AI

Space Weather CD ROM

How do solar terrestrial phenomena affect the ionosphere and many technical systems? You may find the answers and lots of stunning information on the Space Weather CD ROM published by the University of Greifswald. HTML...

Magnetosphäre der Erde und anderer Planeten
Comment: Introduction into the physics of the magnetosphere.

Auroral Activity Report from POES
Comment: Current extent and position of the auroral oval in the northern and southern hemisphere, extrapolated from measurements taken during the most recent polar pass of the NOAA POES satellite.
Note: the POES webpage now provides a new feature, i.e. the estimated time of the next arrival of data. HTML.... (northern hemisphere only)
Hourly STD DMSP/POLAR Auroral activity report
Comment: Including estimated visibility of auroral activity from any location in the northern hemisphere, updated every 5 minutes with the latest solar wind data.
What is the Aurora doing today? Ultraviolet Imager
Comment: What would it be like to sit out in space and look down on the Earth with special UV glasses? (homepage) (current image)
Visible Imaging System/POLAR
Comment: Auroral images from the VIS Earth camera on board of the POLAR spacecraft.
Planetary K index
Comment: Estimated planetary K-index updating every 15 minutes.
Realtime magnetograms
Comment: Please note the actual scale when viewing the magnetograms.
Station Kiruna, Sweden:
Station Lycksele, Sweden:
Station Ny-Aalesund, Norway:
Station Tromsö, Norway: see Ny-Aalesund
Station Leknes, Norway: see Ny-Aalesund
Station Dombaas, Norway: see Ny-Aalesund
Station Wingst, Germany:
Station DK0WCY, Scheggerott, Germany:
Station Fürstenfeldbruck, Germany
Station Braunschweig, Germany
Station Moscow, Russia
See the Ham links section of this web site to view amateur radio webpages dealing with realtime magnetograms.

Magnetogram, Kiruna

POES, Sept. 25, 2001

In memoriam
Prof. Dr. Walter Dieminger, DL6DS

Atmosphären- und Ionosphärenphysik
Comment: Introduction into the physics of the atmosphere and ionosphere.

Space Weather Web
Comment: This website provides near real time data and forecast data of ionospheric parameters relevant to navigation and communication users.
CUTLASS ionospheric data
Comment: Real time data of the CUTLASS radars, see below.
Realtime ionograms
Comment: Public access to the latest ionograms of the Digisonde network.
Tromsö, Norway:
Dourbes, Belgium:
Rome, Italy:
Juliusruh, Germany:
El Arenosillo, Spain:
Millstone Hill, U.S.A.:
see the full 'Digisonde Station List':
... and 'Map Depicting Locations of the Stations':
ESRAD latest data
Comment: Quick-look data from northern Sweden updating every 15 minutes.
SKiYMET - All-Sky Meteor Radar
Comment: Online data on meteor flux at Andoya Rocket Range.
Millstone Hill real time data
Comment: Millstone Hill is one of the nine incoherent scatter radars in the world.
Azimuth scan:
Elevation scan:
Local F-Region:
An Introduction to Meteor Burst Communication
Comment: Some basic information on MBC compiled by K. Mahmud

Daily variation of the ionospheric
Ionogram, Juliusruh


Blitz-Radar, Gewitter Infos so schnell wie der Blitz...
Comment: See the actual radar plot of thunderstorms and lightning activity in central Europe.

Vaisala Lightning Explorer
Comment: The Vaisala Lightning Explorer displays recent lightning activity across the entire continental U.S.
Spectacular flashes recorded above thunderstorms
Comment: Hundreds of unusual red flashes were recorded above thunderstorms reaching the lower ionosphere.
Online weather map of Europe, University of Cologne
Comment: Permanently updated and maintained by the University of Cologne.
Atmospheric sounding, University of Wyoming *** excellent ***
Comment: Vertical profiles of temperature, wind, humidity and other meteorological quantities available for many places around the world.


The Open Radar Initiative - Reliable Technology for Radio Science
Comment: The Open Radar Initiative is a project to develop reliable and reusable technology for radio science applications.
Comment: SuperDARN is a network of high-frequency radars used to study the Earth's ionosphere.
CUTLASS (Co-operative UK Twin Auroral Sounding System)
Comment: Radars located in Iceland and Finland studying the high latitude ionosphere.
Origins of radar-based research in Canada
Comment: D.R. Moorcroft is an expert in ionospheric physics talking about the history of radar applications.
STARE (Scandinavian Twin Auroral Radar Experiment)
Comment: STARE is a coherent scatter ionospheric radar system operating from two locations in central Finland and central Norway.
SOUSY (Sounding System)
Comment: SOUSY is a mesosphere-stratosphere-troposphere (MST) radar which studies the structures and the dynamics of the neutral atmosphere.
SOUSY Svalbard:
ESRAD (Esrange MST radar)
Comment: The Esrange MST radar is an atmospheric radar located at Esrange, just outside Kiruna in northern Sweden. The radar provides information on the dynamic state of the atmosphere - winds, waves, turbulence and layering, from the troposphere up to the lower thermosphere (ca. 1 km -110 km altitude).
SESCAT (Sporadic-E scatter)
Comment: SESCAT operates on 50 MHz and is located on the island of Crete, Greece, studying coherent echoes from the mid latitude E-region.
HLMS (High Latitude Monitoring Station)
Comment: The VHF auroral radar, located at Elmendorf Air Force base near Anchorage, Alaska, measures reflections from intense patches of ionization in the E-region of the ionosphere over Fairbanks, Poker Flat, and the downrange area.
TIGER (Tasman International Geospace Environment Radar)
Comment: The TIGER radar is one of a number of international radars designed to help further our understanding of the near-Earth space (or Geospace) environment.
HAARP (High Frequency Active Auroral Research Program)
Comment: HAARP is a scientific endeavor aimed at studying the properties and behavior of the ionosphere, with particular emphasis on being able to understand and use it to enhance communications and surveillance systems for both civilian and defense purposes.
Comment: The HEATING facility is used to conduct plasma physics and active geophysical research of the lower and upper ionosphere by the controlled injection of powerful HF (4-8 MHz) waves.
LOFAR (Low Frequency Array)
Comment: LOFAR will be a major new multi-element, interferometric, imaging radio telescope designed for the 10-240 MHz frequency range.
European Incoherent Scatter Organisation (EISCAT)
Comment: Incoherent Scatter (IS) radar is the most powerful ground based technique for the study of the Earth's ionosphere and its interactions with the upper atmosphere, the magnetosphere and the interplanetary medium (solar wind).
Tromsö site:
Sodankylä site:
Kiruna site:
Svalbard site:
Present activities
Acrecibo Observatory, Puerto Rico
Comment: The Arecibo telescope is the largest radio telescope in the world.
Sondrestrom IS Radar, Greenland
Comment: The incoherent scatter transmitter station moved from Chatanika, Alaska, to Sondrestrom, Greenland.
Jicamarca Radio Observatory, Peru
Comment: The Jicamarca Radio Observatory is the equatorial anchor of the Western Hemisphere chain of incoherent scatter radar (ISR) observatories extending from Lima, Peru, to Sondrestrom, Greenland.
Space Science in EAS
Comment: The department of Earth and Atmospherics Science at Cornell University studies the Earth's upper atmosphere and ionosphere using high power radars such as the Arecibo and Jicamarca incoherent scatter radars and also small coherent scatter radars like the 30 MHz imaging radar interferometer.
CUTLASS, Finland
The mobile SOUSY radar
HAARP, Alaska

Sondrestrom, Greenland

EISCAT, Spitzbergen
EISCAT, Finland


Radio and Space Plasma Physics Group - University of Leicester
Comment: The Radio and Space Plasma Physics Group is at the forfront of research into the interaction of planetary environments with the solar wind.
Department of Upper Atmosphere Physics and Radiowave Propagation - Irkutsk
ALOMAR Observatory
Andoya Rocket Range
Comment: The ALOMAR observatory in the very far north of Europe is an international facility in atmospheric research. Andoya Rocket Range is the world's northernmost permanent launch facility for sounding rockets and scientific balloons.
Australian Space Weather Agency
IPS Radio and Space Services
Comment: IPS acts as the Australian Space Weather Agency, providing the Australian national radio propagation and space weather services.
MIT Haystack Observatory
Comment: This observatory explores, amoung other research topics, the temporal and spatial variations in the Earth's upper atmosphere and ionosphere.
National Oceanic and Atmospheric Administration (NOAA)
Comment: Excellent web site providing links to all subjects of NOAA's research activities.
University of Oulu, Space Institute
Comment: The Oulu space institute plans, directs and put in effect education, research and development in space oriented topics.
Pokerflat Research Range
Comment: Poker Flat is home to many scientific instruments designed to study the arctic atmosphere and ionosphere.
Radio Communications Research Unit (RCRU) at Rutherford Appleton Laboratory
Comment: The RCRU carries out research on a wide range of topics in radio wave propagation, radio communications and meteorology.
Swedish Institute of Space Physics (IRF)
Comment: The IRF is a governmental research institute. The primary task is to carry out basic research, education, and associated observatory activities in space physics.
Meteor Burst Communication Technology
Comment: Webpage of the Meteor Communication Corporation, USA.
Federation of Astronomical and Geophysical Datanalysis Services (FAGS)
Comment: FAGS was formed ny the International Council of Scientific Unions in 1956 and includes today 12 permanent services.

ESPERE - Enivronmental Science Published for Everybody Round the Earth
Comment: ESPERE stands for a climate information project, which makes available the current knowledge of environmental science.
Leibniz-Institut für Atmosphärenphysik, University of Rostock
Comment: Note, in particular, the radar working group dealing with ground based radar experiments for investigation of the vertical structure of the atmosphere.
Max-Planck-Institute for Aeronomie (MPAE)
Comment: The MPAE is dedicated to the investigation of the solar system, in particular the environments of the Earth, planets, and comets, as well as the sun, its heliosphere and their interaction with the interstellar medium.
Max-Planck-Institute for Extraterrestrial Physics (MPE)
Comment: The MPE's main research topics are astronomical observations in spectral regions (such as Far-Infrared, X-ray and Gamma-ray) which are only accessible from space because of the absorbing effects of the Earth's atmosphere, as well as in-situ measurements in near-Earth space investigating the collisionless interaction of cosmic plasmas.

Bild der Wissenschaft online
Comment: Popular German science magazine.
Astro News
Comment: Online service featuring lastest information in astronomy, astrophysics and space sciences.
Spektrum der Wissenschaft
Comment: Excellent science and research magazine.
Sterne und Weltraum
Comment: Online service covering all areas in astronomy and astrophysics.
Comment: Scientific online service featuring the world of scientific research and technology.
Comment: German webpage of the Nature magazine

Space Physics Textbook (Oulu University, Finland) *** excellent ***
Solar system, magnetosphere, ionosphere, atmosphere, geomagnetic activity, Aurora, waves, instabilities, plasma theory, measurements
Comment: I love this gorgeous resource and wish to express my special regards to the Oulu University staff for providing this excellent textbook in the internet. (contents)
Geophysical Alert Services (Radio Netherlands)
Comment: This excellent page explains the meaning and purpose of geophysical alert broadcasts (by David A. Rosenthal).
Comment: 'The world's best science on your desktop', international webpage
Scientific American
Comment: The oldest continuously published magazine in America, providing insights about developments in science and technology for more than 150 years.
New Scientist
Comment: Latest news, hot topics, opinions, weblinks and archives.
Astronomy Picture of the Day *** excellent ***
Comment: Each day a different image of our fascinating universe is featured, along with a brief explanation.