The Incoherent Scatter Radar (ISR) at Sondrestrom (66.99N, 50.95W) is at the approximate apex magentic latitude of 73.3 magN. The radar was moved from near Fairbanks, Alaska at the Chatanika site (65.1N, 147.4W, ~65.1 magN) by Stanford Research Institute International in 1982-1983. A link to the operations schedule, list arf archived data, and summary plots of all the recent data is located at http://isr.sri.com. All the data are in the SRI madrigal database at http://transport.sri.com/madrigal. The contact person is Anja Stromme (anja.stromme@sri.com, (650)-859-5343, Fax (650)-322-2318, SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025). Please contact her early to confirm correct use of the ISR data and to offer co-authorship for any publications. ACKNOWLEDGMENTS: The Sondrestrom incoherent scatter radar is supported by the National science Foundation. These data for the joint GEM-CEDAR Challenge of 2011 were taken from kindat=5521, which is a 3-position cycle of ~4.5 minutes at the zenith position, and then at 75 degrees elevation angle to the NW and NE. The zenith position had 42 altitudes from 70-578 km, where only 32 altitudes above 100 km were retained. This experiment had better E-region coverage than F-region. Corrected electron densities (Ne in m-3) and ion (Ti in K) and electron (Te) temperatures and their error bars were available. The data were retained if the temperature error bars were <200 K, and if the Ne error bar was less than the Ne value. Approximately 4-5 1-min profiles were averaged PROBABLY SHOULD HAVE DONE MEDIANS INSTEAD BUT THAT WAS HARDER TO CODE! every 20 min to improve the data quality. The maximum F-region Ne value (Nmax in m-3) was found in each profile above 150 km at height hmax (km). If a polynomial fit could be made, Nmax and hmax were refined. The total electron content (TEC in m-2) was found above 100 km using only non-missing data. The analyst for making these 20-min data was Barbara Emery of HAO/NCAR. Anja Stromme did a better job of finding 20 min profiles, TEC, hmax and Nmax by doing .... year dayn moda uth glat glon hmax foF2MHz Nmax(m-3) TEC(m-2) 2005 134 514 21.71 66.99 -50.95 513.91 4.73 0.2778E+12 0.8308E+17 2005 134 514 22.00 66.99 -50.95 501.58 5.31 0.3499E+12 0.7424E+17 2005 134 514 22.33 66.99 -50.95 505.99 4.75 0.2794E+12 0.7315E+17 2005 134 514 22.66 66.99 -50.95 410.89 4.55 0.2567E+12 0.5020E+17 2005 134 514 22.99 66.99 -50.95 294.76 4.11 0.2091E+12 0.5896E+17 2005 134 514 23.33 66.99 -50.95 291.18 4.65 0.2676E+12 0.5657E+17 2005 134 514 23.65 66.99 -50.95 288.41 4.21 0.2197E+12 0.7412E+17 2005 134 514 23.98 66.99 -50.95 226.25 4.71 0.2756E+12 0.6322E+17 2005 135 515 0.31 66.99 -50.95 536.81 5.10 0.3221E+12 0.6576E+17 2005 135 515 0.64 66.99 -50.95 283.57 3.66 0.1663E+12 0.3879E+17 2005 135 515 0.97 66.99 -50.95 536.80 4.48 0.2490E+12 0.7060E+17 2005 135 515 1.34 66.99 -50.95 494.83 4.23 0.2218E+12 0.5238E+17 2005 135 515 1.67 66.99 -50.95 249.75 3.76 0.1756E+12 0.6222E+17 2005 135 515 1.97 66.99 -50.95 407.11 4.36 0.2358E+12 0.4291E+17 2005 135 515 2.31 66.99 -50.95 494.83 4.26 0.2254E+12 0.1123E+18 2005 135 515 2.68 66.99 -50.95 503.95 5.47 0.3708E+12 0.9828E+17 2005 135 515 3.01 66.99 -50.95 536.81 4.67 0.2704E+12 0.7922E+17 2005 135 515 3.32 66.99 -50.95 371.13 3.72 0.1712E+12 0.3894E+17 2005 135 515 3.67 66.99 -50.95 468.69 4.63 0.2656E+12 0.6882E+17 2005 135 515 4.00 66.99 -50.95 536.81 4.37 0.2371E+12 0.8938E+17 2005 135 515 4.32 66.99 -50.95 356.30 3.76 0.1754E+12 0.7214E+17 2005 135 515 4.66 66.99 -50.95 308.77 4.00 0.1989E+12 0.5370E+17 2005 135 515 4.99 66.99 -50.95 546.55 4.61 0.2630E+12 0.7334E+17 2005 135 515 5.37 66.99 -50.95 225.32 4.34 0.2338E+12 0.3376E+17 2005 135 515 5.64 66.99 -50.95 408.21 5.45 0.3687E+12 0.5676E+17 2005 135 515 5.97 66.99 -50.95 398.10 4.19 0.2180E+12 0.6024E+17 2005 135 515 6.33 66.99 -50.95 334.11 3.59 0.1595E+12 0.2731E+17 2005 135 515 6.69 66.99 -50.95 391.17 4.93 0.3018E+12 0.4196E+17 2005 135 515 7.00 66.99 -50.95 494.83 4.73 0.2780E+12 0.7202E+17 2005 135 515 7.32 66.99 -50.95 154.57 4.58 0.2599E+12 0.1045E+18 2005 135 515 7.66 66.99 -50.95 173.58 4.29 0.2280E+12 0.4485E+17 2005 135 515 7.97 66.99 -50.95 452.86 4.53 0.2547E+12 0.4608E+17 2005 135 515 8.32 66.99 -50.95 410.89 3.39 0.1426E+12 0.6157E+17 2005 135 515 8.65 66.99 -50.95 410.89 4.03 0.2016E+12 0.3330E+17 2005 135 515 8.98 66.99 -50.95 368.11 4.85 0.2921E+12 0.8258E+17 2005 135 515 9.31 66.99 -50.95 452.86 5.44 0.3664E+12 0.5778E+17 2005 135 515 9.64 66.99 -50.95 201.00 3.08 0.1178E+12 0.2222E+17 2005 135 515 9.98 66.99 -50.95 224.72 4.38 0.2378E+12 0.5524E+17 2005 135 515 10.32 66.99 -50.95 280.18 4.40 0.2404E+12 0.6235E+17 2005 135 515 10.65 66.99 -50.95 412.88 4.91 0.2985E+12 0.5788E+17 2005 135 515 10.99 66.99 -50.95 223.97 4.77 0.2823E+12 0.6961E+17 2005 135 515 11.33 66.99 -50.95 367.09 4.21 0.2200E+12 0.3864E+17 2005 135 515 11.62 66.99 -50.95 461.21 5.79 0.4160E+12 0.8145E+17 2005 135 515 11.99 66.99 -50.95 463.57 4.89 0.2964E+12 0.1033E+18 2005 135 515 12.33 66.99 -50.95 511.93 4.48 0.2486E+12 0.8395E+17 2005 135 515 12.63 66.99 -50.95 542.52 5.94 0.4376E+12 0.7385E+17 2005 135 515 12.96 66.99 -50.95 192.70 4.23 0.2215E+12 0.6329E+17 2005 135 515 13.32 66.99 -50.95 166.04 4.07 0.2057E+12 0.5103E+17