<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 18:10:00.000"
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="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" >
2026.04.02 (092) 18:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609204021810009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="12.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.336" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.080" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="6.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="310.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="310.000" 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="12.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="591.956" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.989" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.168" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="406.487" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="291.856" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.806" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="152.237" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="69.045" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="81.431" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="195.350" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.190" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="130">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 12.25 12.3 12.35 12.4 12.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
310.000 315.000 317.000 319.000 321.000 323.000 325.000 325.000 325.000 330.000 332.500 335.000 335.000 340.000 341.667 343.333 345.000 346.667 348.333 350.000 355.000 355.000 355.000 355.000 360.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 387.500 390.000 395.000 395.000 397.500 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 430.000 435.000 440.000 440.000 445.000 445.000 450.000 455.000 455.000 460.000 460.000 460.000 465.000 465.000 470.000 470.000 472.500 475.000 475.000 480.000 480.000 480.000 480.000 485.000 485.000 490.000 495.000 495.000 495.000 495.000 500.000 500.000 502.500 505.000 500.000 505.000 510.000 510.000 510.000 513.333 516.667 520.000 522.500 525.000 526.250 527.500 528.750 530.000 535.000 535.000 537.500 540.000 542.500 545.000 549.167 553.333 557.500 561.667 565.833 570.000 575.000 580.000 580.000 585.000 588.287 591.956 596.077 600.737 606.052 612.170 619.287 627.669 637.687 649.872 665.012
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 0 0 0 0 45 48 45 45 0 45 48 45 0 0 48 0 0 51 48 51 45 45 51 51 54 51 51 54 51 54 54 57 57 54 0 54 45 51 0 51 54 51 57 54 57 51 54 51 57 51 57 54 60 60 60 54 60 57 60 57 51 60 51 60 63 60 63 57 60 48 60 60 54 60 60 51 57 57 0 45 0 0 57 51 54 0 45 45 0 51 54 54 0 0 48 0 45 0 0 0 45 48 45 0 0 0 42 0 0 0 0 0 45 42 42 45 48 48 0 45 45 0 42 0 42 0 42 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 -1.953125 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 0.390625 1.953125 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 0.390625 -2.734375 0.390625 0.390625 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.953125 0.390625 0.390625 -1.171875 0.390625 -2.734375 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -2.734375 0.390625 0.390625 -0.390625 0.390625 1.953125 0.390625 -0.390625 0.390625 2.734375
</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" >
89.547 90.0 95.0 100.0 105.0 110.0 113.267 115.0 116.533 119.8 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 406.487 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.237 2.009 2.587 2.892 2.989 2.867 2.867 2.867 2.989 2.997 3.187 3.36 3.524 3.685 3.843 4.001 4.16 4.319 4.479 4.641 4.804 4.969 5.135 5.302 5.471 5.64 5.811 5.982 6.153 6.325 6.498 6.67 6.843 7.016 7.188 7.361 7.533 7.706 7.878 8.05 8.223 8.395 8.567 8.739 8.912 9.085 9.258 9.431 9.605 9.779 9.954 10.129 10.305 10.482 10.659 10.837 11.015 11.193 11.37 11.546 11.72 11.888 12.048 12.193 12.316 12.405 12.448 12.45 12.448 12.437 12.418 12.39 12.355 12.312 12.262 12.205 12.142 12.073 11.998 11.918 11.833 11.743 11.649 11.55 11.448 11.343 11.234 11.122 11.007 10.89 10.771 10.65 10.527 10.403 10.277 10.15 10.022 9.893 9.764 9.634 9.504 9.373 9.243 9.112 8.982 8.852 8.722 8.593 8.464 8.336 8.209 8.082 7.957 7.832 7.708 7.586 7.464 7.343 7.224 7.106 6.989 6.873 6.759 6.645 6.534 6.423 6.314 6.206 6.1 5.995 5.891 5.789 5.689 5.589 5.491 5.395 5.3 5.206 5.114 5.023 4.933 4.845 4.758 4.673 4.589 4.506 4.425 4.344 4.266 4.188 4.112 4.037 3.963 3.891 3.82 3.749 3.681 3.613 3.546 3.481 3.417 3.354 3.292 3.231 3.171 3.112 3.054 2.997 2.942 2.887 2.833 2.78 2.728 2.677 2.627 2.578 2.53 2.483 2.436 2.39 2.346 2.302 2.258 2.216 2.174 2.134 2.093

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.989" PeakHeight="110.0" Num="3" Error="0.0">
-30.186 12.689 -2.956
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.989" EndFrequency="12.45" PeakHeight="406.487" Num="5" zHalfNm="291.856" Error="2.913">
-242.56 -70.517 33.046 -9.27 2.614
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.8" Depth="0.122"/>
<TopsideChapman PeakHeight="406.487" PeakDensity="1923108.0" PeakScaleHeight="81.431" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
