<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 20:50:00.000"
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: 70% PACIFIC flags: F2 cusps do not match</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) 20:50:00</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">
FF202609204022050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="12.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.428" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.344" 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="11.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="265.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="265.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="495.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.362" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="416.840" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="309.852" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.571" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="152.819" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="64.592" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="78.217" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="153.380" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.980" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="201">
<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 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 12.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
265.000 265.000 265.000 265.000 265.000 265.000 265.000 270.000 275.000 275.000 272.500 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 282.500 285.000 287.500 290.000 290.000 290.000 290.000 290.000 290.000 293.333 296.667 300.000 295.000 295.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 305.000 307.500 310.000 310.000 310.000 315.000 315.000 315.000 320.000 321.250 322.500 323.750 325.000 325.000 327.500 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 336.667 338.333 340.000 340.000 342.500 345.000 345.000 345.000 347.500 350.000 350.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 420.000 420.000 425.000 425.000 427.500 430.000 430.000 430.000 435.000 440.000 440.000 445.000 445.000 445.000 445.000 450.000 450.000 450.000 455.000 457.500 460.000 455.000 460.000 465.000 465.000 465.000 470.000 475.000 475.000 480.000 485.000 485.000 490.000 490.000 492.500 495.000 500.000 505.000 510.000 515.000 515.000 520.000 525.000 530.000 536.667 543.333 550.000 556.667 563.333 570.000 576.667 583.333 590.000 596.667 603.333 610.000 620.000 633.750 646.436 660.276 675.434 692.108
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 60 0 0 60 0 63 57 0 0 0 63 63 0 0 69 69 69 69 66 66 69 69 69 69 69 0 63 66 0 0 0 63 0 66 72 60 0 0 0 0 69 69 69 69 0 0 0 57 69 63 66 0 0 69 66 0 69 69 0 66 51 69 0 63 69 69 72 63 0 0 0 63 66 0 54 60 0 69 54 0 66 69 0 0 66 69 60 66 69 69 0 66 69 72 66 63 69 60 60 69 72 72 69 72 72 69 72 60 66 69 57 63 69 72 63 69 69 60 66 69 72 63 69 57 63 69 72 63 66 69 60 69 72 72 66 69 57 63 0 69 63 69 0 66 66 63 0 48 57 45 51 57 60 54 60 63 57 0 54 57 48 57 48 57 48 54 57 54 51 54 54 54 0 51 54 54 51 48 51 54 54 51 0 0 0 0 0 0 0 0 0 0 0 48 48 48 42 0 45 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="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.003 95.0 100.0 105.0 110.0 115.0 120.0 122.333 125.0 130.0 134.667 135.0 140.0 145.0 147.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 416.84 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.909 1.18 1.318 1.362 1.338 1.262 1.208 1.208 1.208 1.208 1.212 1.275 1.337 1.362 1.437 1.555 1.67 1.787 1.908 2.035 2.17 2.315 2.473 2.644 2.831 3.036 3.259 3.501 3.762 4.038 4.328 4.625 4.928 5.233 5.536 5.837 6.133 6.425 6.713 6.995 7.273 7.546 7.814 8.078 8.338 8.594 8.846 9.094 9.339 9.579 9.816 10.048 10.276 10.499 10.716 10.928 11.132 11.328 11.516 11.693 11.857 12.008 12.142 12.258 12.354 12.427 12.475 12.498 12.5 12.498 12.487 12.467 12.437 12.4 12.354 12.3 12.24 12.172 12.098 12.018 11.932 11.841 11.744 11.644 11.539 11.43 11.317 11.201 11.082 10.961 10.836 10.71 10.582 10.452 10.32 10.188 10.054 9.919 9.784 9.648 9.512 9.375 9.239 9.103 8.967 8.831 8.695 8.561 8.427 8.293 8.161 8.029 7.898 7.769 7.64 7.513 7.386 7.262 7.138 7.016 6.895 6.775 6.657 6.54 6.425 6.312 6.199 6.089 5.979 5.872 5.766 5.661 5.558 5.456 5.357 5.258 5.161 5.066 4.972 4.879 4.788 4.699 4.611 4.524 4.439 4.356 4.273 4.193 4.113 4.035 3.958 3.883 3.809 3.736 3.665 3.595 3.526 3.458 3.392 3.326 3.262 3.199 3.137 3.077 3.017 2.959 2.902 2.845 2.79 2.736 2.683 2.631 2.579 2.529 2.48 2.432 2.384 2.338 2.292 2.247 2.203 2.16 2.118 2.076 2.036 1.996

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.362" PeakHeight="110.0" Num="3" Error="0.0">
-27.772 9.453 -1.678
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.362" EndFrequency="12.5" PeakHeight="416.84" Num="5" zHalfNm="309.852" Error="7.302">
-264.005 -9.828 9.855 -10.593 4.731
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="37.0" Depth="0.154"/>
<TopsideChapman PeakHeight="416.84" PeakDensity="1938585.6" PeakScaleHeight="78.217" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
