propagation · live
Can we go far today?
Shortwave only crosses the ocean because it bounces off the ionosphere, and the Sun runs the ionosphere. That is why radio amateurs watch sunspots like fishermen watch the tides. Here are the current numbers, what they mean, and what the WSPR network actually measured. Understand propagation without mystery.
Solar flux
10.7 cm. Above 120 the high bands open up.
K Index
Magnetic field disturbance, from 0 to 9.
Solar X-rays
Class now. M and X black out shortwaves.
Forecast by band
Global estimate by N0NBH, not measured here.
Lendo...
NOAA scales now
From 0 (none) to 5 (extreme).
Lendo...
Gray line
Where it is day and where it is night right now. Around sunrise and sunset, the lower bands usually yield DX.
Solar X-rays, past 24 hours
GOES satellite. Each step on the scale represents ten times more energy.
Lendo...
Kp Index, last 7 days
Every three hours. When it rises, shortwaves get worse.
Lendo...
Solar cycle
The Sun has a cycle of about 11 years. At maximum, the high bands stay open.
Lendo...
WSPR: actually measured propagation
WSPR is a network of very low power beacons. Each spot is proof that a signal left one place and arrived at another. This includes only paths starting or ending in Sao Paulo and surroundings in the last 24 hours, openly published by the WSPRnet network.
By band
Lendo...
What time each band opens
Logs by Brasília time, spanning three days. The lighter the color, the more signal passing through.
Lendo...
The longest paths of the day
Tap a line to see where it came from and where it arrived. Only the prefix of each station appears.
Data: sol.json, clima-espacial.json, raios-x.json, ciclo-solar.json, wspr.json. Sources: N0NBH (hamqsl.com, author rights reserved, used with credit), NOAA Space Weather Prediction Center and SILSO (public domain) and WSPRnet via wspr.live (non-commercial use only). No affiliation or endorsement from any of them.