This page provides access to plots of several indices of solar and geomagnetic activity that are frequently used as inputs to space-weather models. Brief definitions of each of the indices plotted are as follows:

• X-ray: Solar x-ray flux over the band 1-8 Angstroms;
• F10.7 - Solar radio noise flux at a wavelength of 10.7 cm;
• GPS-derived F10.7 - F10.7 value derived from GPS IONO coefficients;
• SSNe - Effective sunspot number derived from ionospheric measurements;
• SWS T index - Ionospheric index derived from ionospheric measurements;
• Ap - Daily global index of geomagnetic activity (preliminary).
• Kp - 3-hour global index of geomagnetic activity (preliminary).
• Qe - Effective Q index (auroral activity index).

Tabular listing of selected indices.

Maps of Geomagnetic Latitude and Regimes

Near Real-Time Plots

Plot of (Provisional) Kp Geomagnetic Activity Index, DSCOVR solar wind data, GOES Magnetometer data

Plot of Qe Auroral Oval Index, DSCOVR solar wind data, GOES Magnetometer data

Plot of R/T 24hr SSNe Index

Plots of Daily Indices

1-8 Angstron Solar X-ray Flux

10.7cm Solar Radio Flux (Observed and Inferred)

Effective SSN and T Indices

Geomagnetic Daily Ap Index (Provisional)

Comparison of SSN Indices

Plots of NOAA/SWPC 27-day F10 and Ap Forecasts

Track the status of the solar-cycle: one year of SSNe

Cycles 23-25 Effective Sunspot Number plot.

The data shown in these plots came from the following sources:

• F10.7 and SSN from the NOAA Space Weather Prediction Center(SWPC)
• GPS IONO coefficients from the NOAA NGS CORS site.
• SSNe from NWRA calculated using foF2 data from the NOAA NCEI
• SWS T index from the Austrailian Space Weather Services (SWS).
• Provisional Kp and Ap from the GeoForchungsZentrum Helmholtz Centre Potsdam.

If you would like to get a feel for how effective these effective-SSN indices are, foF2 plots comparing the observations with model foF2 values calculated using the NWRA SSNE and SWS T values are available. There is a one-day delay between the latest SSNe values available and these plots to permit more data to arrive at the NOAA NCEI for comparison.

Daily foF2 Comparison Plots

If you are interested in further information regarding ionospheric radio propagation, the Radio Society of Great Britain Propagation Studies Committee has a large collection of links to things propagational.