Current Space Weather VOACAP Quick Guide: Home

 

VOACAP SSNs for 2011

Below is the list of (near-)current sunspot numbers to be used with VOACAP. This list is manually updated on a regular basis. Consult the source for the latest numbers; new SSN predictions are now available!

2011

JAN 32.4  JUL 45.1
FEB 34.4  AUG 47.0
MAR 36.2  SEP 49.1
APR 38.6  OCT 51.6
MAY 41.4  NOV 53.8
JUN 43.4  DEC 55.3

Source: ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SUNSPOT_NUMBERS/sunspot.predict

Propagation tools to aid short-term prediction

Current Grayline

Real-Time Solar Wind   http://www.sec.noaa.gov/SWN/sw_dials.gif, National Oceanic and Atmospheric Administration, Space Environment Center

Magnetogram: State of Earth's Magnetic Field

Variations in Earth's magnetic field are measured by magnetometers. Any strong and sudden variations (up or down) in the X component (uppermost graph) are indications of VHF radio-auroral activity (e.g. on 144 MHz when variations suddenly peak, say, 300 nT).

http://sgodata.sgo.fi/pub_mag/Magplots/SOD_latest.GIF, Sodankylä Geophysical Observatory

http://flux.phys.uit.no/cgi-bin/plotgeodata.cgi?Last24&site=kev1a&, Utsjoki/Kevo

Real-Time K-Index

A 3-hourly index of geomagnetic activity expressed in the logarithmic units on a scale from 0 to 9.

http://flux.phys.uit.no/Kindice/k_tro2a.gif, Tromsø Geophysical Observatory

X-Ray Flux

Class M and X flares affect the sunlit area of the Earth, causing increased D-region absorption. Strong flares are source of Shortwave Fadeouts (SWF) and Sudden Ionospheric Disturbances (SID). Look for the 1-8 Angstrom graph (red).

Proton Flux

High-energy protons are guided into the polar cap by Earth's magnetic field. Strong proton bursts are source of Polar Cap Absorption (PCA), i.e. high D-region absorption on paths passing through the polar areas. A proton event is in progress if the red curve crosses the threshold (dotted white line) in the uppermost graph.