<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-17 -290 20:10:00.000"
URSICode="SAA0K"
StationName="SaoLuis"
GeoLatitude="-2.6"
GeoLongitude="315.8"
Source="Ionosonde"
SourceType="DPS-4"
ScalerType="auto">
<SystemInfo UMLStationID="903">
<FrequencyStepping StartFrequency="1.0" StopFrequency="15.0">
<LinearStepping Step="0.05" Units="MHz" />
</FrequencyStepping>
<RangeStepping StartRange="80.0" StopRange="1360.0" >
<LinearStepping Step="5.0" Units="km" />
</RangeStepping>
<AutoScaler Name="Artist5" Version="500200" ArtistFlags="2 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x cusp</Comments>
<ContactPerson>
<Name>Dr. Mangalathayil Ali Abdu</Name>
<Affiliation>INPE, Division of Aeronomy</Affiliation>
<Address>Av dos Astronautas, 1.758 Jd. Granja - CEP: 12227-010 Sao Jose dos Campos - SP Brasil</Address>
<Email>maabdu@dae.inpe.br</Email>
</ContactPerson>
<StartTime Format="yyyy.MM.dd (DDD) HH:mm:ss" TimeZone="Coordinated Universal Time" >
2026.10.17 (290) 20:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.39" Model="IGRF 3.0" Altitude="300"/>
<DeclinationAngle Val="-19.74" Model="IGRF 3.0" Altitude="300"/>
<SunSpotNumber Val="-1.0" Status="predicted"/>
</SolarTerrestrialData>
<DigisondePreface Format="FF">
FF202629010172010009039031101000005015000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="11.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.689" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.466" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="280.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="280.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="110.000" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="20.000" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="460.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.824" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="364.761" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="281.770" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="10.446" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="117.431" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="45.428" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="61.646" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="130.960" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.540" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="151">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
4.2 4.25 4.3 4.35 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 5.95 6.0 6.05 6.1 6.15 6.2 6.25 6.3 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
280.000 280.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 290.000 290.682 291.364 292.045 292.727 293.409 294.091 294.773 295.455 296.136 296.818 297.500 298.182 298.864 299.545 300.227 300.909 301.591 302.273 302.955 303.636 304.318 305.000 305.000 310.000 310.000 311.250 312.500 313.750 315.000 315.000 316.667 318.333 320.000 320.000 322.500 325.000 322.500 320.000 325.000 330.000 330.000 330.000 332.500 335.000 335.000 335.000 335.000 335.000 335.000 336.603 338.205 339.808 341.410 343.013 344.615 346.218 347.821 349.423 351.026 352.628 354.231 355.833 357.436 359.038 360.641 362.244 363.846 365.449 367.051 368.654 370.256 371.859 373.462 375.064 376.667 378.269 379.872 381.474 383.077 384.679 386.282 387.885 389.487 391.090 392.692 394.295 395.897 397.500 399.103 400.705 402.308 403.910 405.513 407.115 408.718 410.321 411.923 413.526 415.128 416.731 418.333 419.936 421.538 423.141 424.744 426.346 427.949 429.551 431.154 432.756 434.359 435.962 437.564 439.167 440.769 442.372 443.974 445.577 447.179 448.782 450.385 451.987 453.590 455.192 456.795 458.397 460.000 465.000 475.000 480.000 485.000 490.000 495.000 504.388 515.644 529.388 546.546 568.573 597.881
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 66 57 0 0 0 0 0 0 0 69 63 0 51 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 87 84 81 81 0 0 0 78 81 0 51 78 75 63 63 0 81 0 69 75 75 0 72 75 81 81 0 78 0 78 0 0 0 0 0 0 0 0 0 54 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 63 63 57 57 57 60 60 63 57 60 57 0 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -2.734375 -0.390625 1.171875 -1.171875 -0.390625 2.734375 -0.390625 -0.390625 2.734375 0.390625 -0.390625 2.734375 1.953125 -0.390625 -0.390625 2.734375 -1.171875 -1.171875 1.953125 2.734375 2.734375 -2.734375 2.734375 -0.390625 0.390625 -1.953125 -2.734375 1.953125 1.953125 2.734375 -0.390625 -0.390625 -2.734375 1.953125 -1.171875 -2.734375 -1.953125 1.171875 -0.390625 0.390625 -2.734375 2.734375 -2.734375 -1.171875 0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.815 90.0 95.0 100.0 105.0 110.0 115.0 119.208 120.0 125.0 128.417 130.0 135.0 137.625 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 364.761 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.216 1.221 1.58 1.765 1.824 1.785 1.688 1.688 1.688 1.688 1.711 1.785 1.824 1.907 2.074 2.237 2.401 2.566 2.736 2.91 3.09 3.276 3.468 3.667 3.872 4.084 4.303 4.528 4.759 4.996 5.239 5.487 5.74 5.998 6.26 6.525 6.794 7.066 7.34 7.617 7.895 8.174 8.454 8.733 9.012 9.288 9.561 9.83 10.093 10.347 10.59 10.82 11.032 11.223 11.387 11.521 11.621 11.681 11.7 11.7 11.692 11.67 11.634 11.585 11.525 11.454 11.372 11.281 11.181 11.073 10.957 10.835 10.706 10.572 10.433 10.29 10.143 9.993 9.84 9.684 9.527 9.367 9.207 9.046 8.884 8.722 8.56 8.398 8.237 8.077 7.917 7.759 7.601 7.445 7.291 7.138 6.987 6.838 6.691 6.546 6.403 6.262 6.123 5.987 5.852 5.72 5.59 5.463 5.338 5.215 5.094 4.976 4.86 4.746 4.635 4.526 4.419 4.314 4.212 4.111 4.013 3.917 3.823 3.731 3.641 3.554 3.468 3.384 3.302 3.221 3.143 3.066 2.991 2.918 2.847 2.777 2.709 2.643 2.578 2.514 2.453 2.392 2.333 2.276 2.219 2.165 2.111 2.059 2.008 1.958 1.91 1.862 1.816 1.771 1.727 1.684 1.642 1.602 1.562 1.523 1.485 1.448 1.412 1.377 1.343 1.309 1.276 1.245 1.214 1.183 1.154 1.125 1.097 1.07 1.043 1.017 0.992 0.967 0.943 0.919 0.896 0.874 0.852 0.831 0.81 0.79 0.77

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.824" PeakHeight="110.0" Num="3" Error="0.0">
-28.776 10.73 -2.139
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.824" EndFrequency="11.7" PeakHeight="364.761" Num="5" zHalfNm="281.77" Error="2.212">
-206.005 -30.921 11.131 -2.445 1.104
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="27.625" Depth="0.136"/>
<TopsideChapman PeakHeight="364.761" PeakDensity="1698387.1" PeakScaleHeight="61.646" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
