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How Effective are Effective-SSN Values?

Plot of foF2 Obs/Model

This page links to plots comparing ionospheric parameters calculated from models using effective SSN values (the NWRA and the IPS T-index values) to foF2 observations and 7-day means for a variety of stations. Note that not all of the data shown in these plots went into the SSNe calculations. All stations above a geomagnetic latitude of 50deg were excluded, and some of the data were not received prior to the SSNe calculations.

The foF2 parameter shown in these plots, and used in generating the two effective SSN indices, is defined as the highest frequency which will reflect from the main (F2) layer of the ionosphere on a vertical propagation path. It is measured at a number of locations around the world using an instrument known as an ionosonde. The "o" in foF2 indicates that it is for the "ordinary" propagation mode (as opposed to the extraordinary, or "x", mode). More details on this measurement and on ionosondes can be found at the National Geophysical Data Center (NGDC) ionospheric WWW site.

All plots have the same format as the one shown above. The foF2 observations for the UT day from the station are plotted as + symbols, and the 7-day mean foF2 are plotted as * symbols. The lines are foF2 values calculated from the CCIR foF2 model (the URSI-88 coefficients) using the NWRA SSNe (solid line) and the IPS T (dashed line).

To hourly SSNe24 plot
To 24-day SSNe24 plot


Comparisons are available for the following stations:


Geographic Geomagnetic
Station Name IUWDS Latitude Longitude Latitude Longitude
*Dixon 38701 74.0 81.0 68.8 156.8
*Tromso - 69.7 18.9 67.0 104.2
*Murmansk 03702 68.0 33.0 64.5 113.9
*Gakona - 62.0 215.0 63.1 266.8
*Salekhard 37701 66.0 66.0 61.7 141.2
*Magadan 45601 60.0 151.0 53.9 218.0
*Moscow 34503 55.0 37.0 52.3 111.7
*Tomsk 38601 56.0 85.0 51.6 157.1
Boulder 20401 40.0 -105.2 49.7 318.8
Fairford - 52.0 1.0 49.4 80.1
Wallops Island 17402 37.0 -75.0 49.0 359.6
Warsaw 32507 52.0 21.0 48.3 96.8
Dourbes - 50.0 5.0 46.8 82.8
Pruhonice - 50.0 15.0 46.3 91.1
Eglin AFB 19303 30.0 -86.0 42.1 344.0
Khabasrovsk 03501 48.0 135.0 41.6 206.1
Rome - 41.8 12.6 36.8 87.4
Roquetes - 41.0 0.0 36.3 76.4
San Vito - 40.6 18.0 35.4 92.0
Beijing 42404 40.0 116.0 34.1 187.9
Athens - 38.1 23.9 32.6 97.1
Ashkhabad 36401 37.0 58.0 32.4 130.0
El Arenosillo - 37.0 353.0 32.0 69.8
Ramey 78514 18.5 -67.2 30.3 7.7
Jeju - 33.0 126.0 29.4 198.6
*Ascension Island - -8.0 -14.6 -17.0 54.0
Darwin 83101 -12.0 131.0 -22.3 202.5
Cocos Island - -12.0 97.0 -23.1 167.1
Nuie - -19.0 170.0 -25.3 245.0
Townsville 85201 -19.0 147.0 -28.9 220.4
Madimbo - -22.0 31.0 -32.8 99.7
Learmonth 81202 -21.0 115.0 -32.9 185.7
Norfolk Island - -29.0 168.0 -36.5 245.4
Brisbane - -27.0 153.0 -36.9 228.4
Louisvale - -29.0 21.0 -38.6 86.6
Grahamstown - -33.0 27.0 -41.9 91.1
Hermanos - -34.0 19.0 -42.2 82.2
Camden 85305 -34.0 151.0 -44.7 227.7
Perth - -32.0 116.1 -45.6 187.6
Canberra 85302 -35.0 149.0 -46.0 225.6
*Hobart 85401 -42.0 147.0 -53.8 225.2
*Mawson - -67.6 62.9 -71.0 91.4
*Scott Base - -77.0 166.0 -80.3 320.0
*Casey 81701 -66.3 110.5 -80.8 157.5

[NOTE: Stations marked with an * were not included in the SSNe calculation either because they are above the high-latitude cutoff
(poleward of 50deg geomagnetic latitude) or because they were excluded for data quality reasons.]


AKNOWLEDGEMENT:
The fof2 data used in these plots came from the NOAA Space Environment Center. The IPS T index came from the Australian IPS Radio and Space Services organization..

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