Northwest Research Associates, Inc.

Main Pages: [ NWRA SpaWx Services Home | SpaWx Indices Home | Scintillation Home | Scintillation Services Home | ]
Graphics: [ F10 | Ap | F10/Ap Forecasts | SSNe | SSN Comparison | 24hr SSNe | Auroral Qe Index (DMSP) ]
Listings/Reports: [ Indices Table | Events | RSGA | SGAS | SRS ]

Space Weather Indices


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:

Additional information defining the various indices are included with the expanded plots that are obtained by clicking on the "button" versions of the plots on this page. References for the various indices are listed at the end of each page of expanded plots.

Tabular listing of selected indices.


Near Real-Time Plots

Plot of R/T Qe and Auroral Boundary Indices (DMSP)

Plot of R/T 24hr SSNe Index


Plots of Daily Indices

Picture 10.7cm Solar Radio Flux (Observed and Inferred)

Picture Effective SSN and T Indices

Picture Geomagnetic Daily Ap(est) Index

Picture 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 and 24 Effective Sunspot Number plot.

Maps of Geomagnetic Latitude and Regimes


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

This is not an exhaustive look at the issue of ionosphere-related space-weather indices.
Additional indices can be obtained from the National Geophysical Data Center.


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 IPS 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 SWPC for comparison.

Chung-Li Plot 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.

NWRA Space Weather Links

[ Space Weather Home Page | Scintillation Home Page ]

[ Home | About NWRA | Staff | Research Areas | Products ]

How to contact NWRA

Copyright © 1996-2014 NorthWest Research Associates, Inc.  All rights reserved.