<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 19:50:00.000"
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="18.0">
<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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x cusp, One of F2 cusps was derived from the other</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" >
2026.02.28 (059) 19:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605902281950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="12.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.765" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="33.734" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="250.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="250.000" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="462.482" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.399" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="345.915" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="280.001" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.509" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="89.690" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="39.588" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="47.083" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="120.950" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.010" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="166">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.95 4.0 4.05 4.1 4.15 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 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
250.000 250.000 250.000 250.000 255.000 255.000 255.000 255.000 255.000 260.000 265.000 265.000 265.000 265.000 267.500 270.000 270.000 270.000 270.000 270.000 275.000 276.250 277.500 278.750 280.000 280.000 280.000 285.000 286.250 287.500 288.750 290.000 295.000 295.000 295.000 295.000 297.500 300.000 300.000 300.000 302.500 305.000 307.500 310.000 311.667 313.333 315.000 316.667 318.333 320.000 320.000 320.000 320.000 322.500 325.000 327.500 330.000 330.000 332.500 335.000 335.000 335.000 340.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 351.667 353.333 355.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 370.000 370.000 372.500 375.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 392.500 395.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 405.000 405.000 405.000 405.000 415.000 415.000 410.000 415.000 420.000 417.500 415.000 417.500 420.000 420.000 420.000 422.500 425.000 425.000 425.000 425.000 425.000 425.000 427.500 430.000 432.500 435.000 435.000 435.000 437.500 440.000 441.667 443.333 445.000 446.667 448.333 450.000 450.000 455.000 455.000 456.128 457.404 458.859 460.534 462.482 464.777 467.519 470.855 475.000 480.289 487.271
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 51 51 57 63 66 66 63 66 0 0 0 63 0 57 60 60 0 60 60 0 0 0 60 0 63 60 45 0 0 63 54 0 0 66 0 60 48 66 0 63 0 57 0 48 0 63 0 57 0 69 72 0 69 0 63 66 54 63 69 72 60 66 72 60 63 69 51 57 0 45 54 60 60 57 54 60 63 57 60 45 48 0 54 0 66 69 57 60 66 66 60 60 63 69 66 66 63 63 57 0 60 57 0 66 63 66 66 66 63 57 63 66 0 72 69 72 66 57 54 0 63 63 0 0 0 0 48 0 60 45 42 0 0 57 0 57 0 57 0 51 0 54 0 48 0 0 48 0 0 48 51 48 48 51 51 0 51 0 51 0 0 51 42 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</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" >
89.662 90.0 95.0 100.0 105.0 110.0 115.0 116.091 120.0 122.183 125.0 128.274 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 345.915 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.228 1.61 2.077 2.321 2.399 2.315 2.273 2.273 2.273 2.331 2.399 2.448 2.592 2.74 2.893 3.05 3.212 3.379 3.553 3.731 3.915 4.104 4.299 4.497 4.701 4.908 5.119 5.333 5.55 5.771 5.994 6.22 6.448 6.679 6.913 7.149 7.388 7.629 7.873 8.121 8.372 8.627 8.885 9.149 9.417 9.691 9.971 10.258 10.552 10.853 11.161 11.474 11.781 12.05 12.196 12.2 12.191 12.157 12.1 12.021 11.922 11.805 11.672 11.524 11.363 11.19 11.008 10.816 10.618 10.413 10.203 9.989 9.773 9.554 9.333 9.112 8.891 8.67 8.451 8.233 8.017 7.803 7.592 7.385 7.18 6.978 6.781 6.587 6.396 6.21 6.028 5.85 5.676 5.506 5.34 5.178 5.021 4.867 4.718 4.572 4.431 4.293 4.16 4.03 3.903 3.781 3.662 3.546 3.434 3.325 3.219 3.117 3.017 2.921 2.828 2.737 2.649 2.564 2.482 2.402 2.325 2.25 2.177 2.107 2.039 1.973 1.909 1.848 1.788 1.73 1.674 1.619 1.567 1.516 1.467 1.419 1.373 1.329 1.285 1.244 1.203 1.164 1.126 1.089 1.054 1.02 0.986 0.954 0.923 0.893 0.864 0.836 0.809 0.782 0.757 0.732 0.708 0.685 0.663 0.641 0.62 0.6 0.581 0.562 0.543 0.526 0.508 0.492 0.476 0.46 0.445 0.431 0.417 0.403 0.39 0.377 0.365 0.353 0.341 0.33 0.32 0.309 0.299 0.289 0.28 0.271 0.262

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.399" PeakHeight="110.0" Num="3" Error="0.0">
-29.599 11.849 -2.588
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.399" EndFrequency="12.2" PeakHeight="345.915" Num="5" zHalfNm="280.001" Error="1.676">
-166.579 -69.772 24.466 -7.102 1.346
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="18.274" Depth="0.126"/>
<TopsideChapman PeakHeight="345.915" PeakDensity="1846650.1" PeakScaleHeight="47.083" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
