<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-31 -090 10:10:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2o 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" >
2026.03.31 (090) 10:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202609003311010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.961" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.349" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.100" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="230.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="230.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="387.212" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="2.277" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.100" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.100" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="311.378" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="228.816" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.312" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="115.385" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="26.677" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="63.545" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="116.770" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.230" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="117">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
230.000 230.000 230.000 230.000 235.000 235.000 235.000 235.000 235.000 235.000 235.000 235.000 240.000 240.000 240.000 240.000 240.000 245.000 245.000 245.000 245.000 245.000 245.000 250.000 250.000 250.000 255.000 255.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 265.000 265.000 270.000 275.000 276.250 277.500 278.750 280.000 281.000 282.000 283.000 284.000 285.000 285.000 290.000 290.000 290.000 292.500 295.000 297.500 300.000 300.000 300.000 300.000 300.000 300.000 302.500 305.000 310.000 310.000 310.000 310.000 310.000 312.500 315.000 315.000 317.500 320.000 320.000 320.000 320.000 325.000 325.000 325.000 330.000 330.000 330.000 335.000 335.000 340.000 345.000 345.000 345.000 350.000 350.000 355.000 355.000 355.000 365.000 365.000 365.000 370.000 370.000 372.698 375.704 379.074 382.880 387.212 392.185 397.956 404.731 412.798 422.566 434.636 449.930 469.939 497.242 536.716 598.830
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 57 57 57 60 63 63 60 0 54 57 60 0 57 57 57 57 57 0 63 63 69 0 69 63 66 51 57 60 63 66 66 60 63 0 63 57 0 60 54 0 0 0 60 0 0 0 0 66 0 63 0 54 0 63 0 57 63 0 0 72 69 45 72 60 0 69 72 72 0 66 69 0 63 69 66 69 72 66 66 72 69 75 78 63 72 57 66 69 66 72 72 75 72 66 66 66 69 60 72 69 78 66 69 72 63 66 69 69 72 66 60 54 45 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 2.734375 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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 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" >
89.689 90.0 95.0 100.0 105.0 110.0 115.0 116.722 120.0 123.444 125.0 130.0 130.166 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 311.378 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.226 1.528 1.972 2.203 2.277 2.207 2.15 2.15 2.15 2.179 2.274 2.277 2.418 2.566 2.717 2.871 3.031 3.196 3.367 3.544 3.73 3.923 4.125 4.337 4.559 4.79 5.032 5.284 5.544 5.811 6.084 6.358 6.631 6.899 7.158 7.405 7.637 7.851 8.047 8.222 8.378 8.513 8.627 8.721 8.795 8.85 8.884 8.899 8.9 8.897 8.884 8.862 8.83 8.789 8.741 8.684 8.62 8.55 8.474 8.392 8.305 8.213 8.117 8.017 7.914 7.808 7.699 7.588 7.475 7.36 7.243 7.126 7.008 6.889 6.769 6.65 6.53 6.411 6.292 6.173 6.055 5.938 5.822 5.706 5.592 5.479 5.367 5.256 5.147 5.039 4.933 4.828 4.724 4.622 4.522 4.423 4.326 4.231 4.137 4.045 3.955 3.866 3.779 3.693 3.61 3.527 3.447 3.368 3.29 3.214 3.14 3.067 2.996 2.927 2.858 2.792 2.726 2.662 2.6 2.539 2.479 2.42 2.363 2.307 2.252 2.199 2.147 2.096 2.046 1.997 1.949 1.903 1.857 1.813 1.77 1.727 1.686 1.646 1.606 1.567 1.53 1.493 1.457 1.422 1.388 1.354 1.322 1.29 1.259 1.229 1.199 1.17 1.142 1.114 1.087 1.061 1.035 1.01 0.986 0.962 0.939 0.916 0.894 0.872 0.851 0.831 0.81 0.791 0.772 0.753 0.735 0.717 0.7 0.683 0.666 0.65 0.634 0.619 0.604 0.589 0.575 0.561 0.547 0.534 0.521 0.508 0.496

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.277" PeakHeight="110.0" Num="3" Error="0.0">
-29.452 11.642 -2.501
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.277" EndFrequency="8.9" PeakHeight="311.378" Num="5" zHalfNm="228.816" Error="3.193">
-172.439 -5.119 -6.279 2.838 -0.213
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="20.166" Depth="0.127"/>
<TopsideChapman PeakHeight="311.378" PeakDensity="982754.3" PeakScaleHeight="63.545" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
