<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 20:30:00.000"
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: 70% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, Unidentified traces above foF2</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) 20:30:00</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">
FF202609204022030009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="11.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.717" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.435" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="260.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="260.000" 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="0.450" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.950" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="475.808" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.755" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="356.405" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="286.544" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.617" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="97.146" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="33.732" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="48.747" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="109.840" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.410" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="175">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.85 3.9 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
265.000 265.000 265.000 265.000 265.000 265.000 265.000 260.000 270.000 270.000 265.000 265.000 265.000 265.000 265.000 265.000 265.000 265.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 275.000 275.000 275.000 275.000 275.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 285.000 286.667 288.333 290.000 290.000 290.000 290.000 291.667 293.333 295.000 296.667 298.333 300.000 300.000 300.000 300.000 301.250 302.500 303.750 305.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 317.500 320.000 320.000 320.000 320.000 325.000 326.250 327.500 328.750 330.000 330.000 332.500 335.000 335.000 335.000 335.000 337.500 340.000 340.000 340.000 342.500 345.000 345.000 350.000 350.000 350.000 350.000 352.500 355.000 355.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 375.000 375.000 375.000 380.000 380.000 385.000 385.000 385.000 385.000 390.000 390.000 395.000 395.000 395.000 395.000 400.000 400.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 410.000 415.000 420.000 420.000 420.000 420.000 425.000 425.000 430.000 430.000 430.000 432.500 435.000 435.000 435.000 435.000 435.000 438.750 442.500 446.250 450.000 455.000 455.000 455.000 457.500 460.000 465.000 467.500 470.000 470.000 470.000 470.000 470.000 472.500 475.808 479.832 484.832 491.212 499.634 511.266
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 60 0 0 63 51 48 48 63 63 51 63 63 63 63 63 66 0 66 0 66 0 63 63 60 54 60 60 57 60 57 63 0 0 69 69 0 63 0 54 66 0 0 66 66 69 66 0 0 0 54 0 63 66 69 69 0 0 0 69 60 0 69 54 72 63 66 72 0 63 66 0 69 63 45 0 0 63 69 0 57 0 66 72 60 66 0 72 60 66 69 60 0 69 72 63 69 72 60 66 72 75 66 69 75 66 72 57 63 69 75 75 69 72 63 69 72 72 69 72 60 69 72 72 69 72 60 66 72 75 66 69 60 69 72 60 63 0 69 66 66 57 63 63 57 63 63 63 60 54 0 60 60 57 45 54 57 51 57 51 0 51 54 51 51 48 54 51 0 54 51 48 0
</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 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 -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 -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" >
89.837 90.0 95.0 100.0 105.0 110.0 115.0 119.617 120.0 125.0 129.233 130.0 135.0 138.85 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 356.405 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.214 1.175 1.52 1.698 1.755 1.718 1.617 1.617 1.617 1.617 1.628 1.7 1.755 1.779 1.878 1.975 2.074 2.175 2.28 2.39 2.507 2.633 2.768 2.915 3.076 3.253 3.449 3.665 3.902 4.161 4.438 4.728 5.027 5.328 5.628 5.924 6.214 6.499 6.777 7.049 7.317 7.58 7.84 8.097 8.351 8.605 8.857 9.109 9.362 9.615 9.87 10.126 10.382 10.635 10.876 11.08 11.194 11.2 11.194 11.167 11.12 11.054 10.97 10.871 10.757 10.63 10.491 10.342 10.184 10.018 9.845 9.667 9.483 9.296 9.105 8.912 8.717 8.522 8.326 8.13 7.934 7.74 7.546 7.355 7.166 6.979 6.794 6.612 6.433 6.257 6.085 5.915 5.749 5.587 5.427 5.272 5.12 4.971 4.826 4.684 4.546 4.412 4.281 4.153 4.029 3.908 3.79 3.675 3.564 3.456 3.35 3.248 3.149 3.052 2.959 2.868 2.779 2.694 2.61 2.53 2.451 2.375 2.302 2.23 2.161 2.093 2.028 1.965 1.904 1.844 1.787 1.731 1.677 1.624 1.573 1.524 1.476 1.43 1.385 1.342 1.3 1.259 1.219 1.181 1.144 1.108 1.073 1.039 1.007 0.975 0.944 0.915 0.886 0.858 0.831 0.805 0.779 0.755 0.731 0.708 0.686 0.664 0.643 0.623 0.603 0.584 0.566 0.548 0.531 0.514 0.498 0.482 0.467 0.452 0.438 0.424 0.411 0.398 0.385 0.373 0.361 0.35 0.339 0.328 0.318 0.308 0.298

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.755" PeakHeight="110.0" Num="3" Error="0.0">
-28.653 10.567 -2.077
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.755" EndFrequency="11.2" PeakHeight="356.405" Num="5" zHalfNm="286.544" Error="3.933">
-172.888 -53.94 18.614 -14.907 5.566
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="28.85" Depth="0.138"/>
<TopsideChapman PeakHeight="356.405" PeakDensity="1556327.5" PeakScaleHeight="48.747" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
