<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-18 -077 14:40:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x 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" >
2026.03.18 (077) 14:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607703181440009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="9.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.590" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.825" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.150" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.360" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="330.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="330.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="101.848" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="96.033" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="5.883" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="385.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.401" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.365" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="353.003" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="214.005" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.030" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="184.115" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="45.846" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="103.274" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="210.260" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.770" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="73">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 331.667 333.333 335.000 335.000 335.000 335.000 335.000 337.500 340.000 342.500 345.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 360.000 365.000 365.000 365.000 370.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 395.000 405.000 405.000 410.000 420.000 420.000 425.000 435.000 440.000 440.000 445.000 450.000 460.000 465.000 470.000 480.000 485.000 490.000 500.000 505.000 510.000 520.000 530.000 540.000 545.000 560.000 580.000 590.000 615.000 640.000 676.504 727.146
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 54 54 57 57 57 57 0 51 51 0 0 48 48 51 51 48 0 57 0 57 48 0 57 57 54 54 57 57 48 57 57 57 54 60 57 57 60 57 54 57 48 57 57 48 60 60 51 51 54 57 60 60 57 54 57 54 51 54 57 57 57 57 57 54 54 54 54 0 0 51 51
</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 1.953125 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="5">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.15 3.2 3.25 3.3 3.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
101.848 102.592 103.425 104.371 105.471
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 0 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 0.390625 2.734375 -0.390625
</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" >
90.0 95.0 96.033 97.537 99.041 100.0 100.545 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 353.003 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 3.306 3.36 3.238 3.238 3.316 3.36 3.497 3.64 3.777 3.91 4.042 4.172 4.303 4.434 4.566 4.699 4.833 4.969 5.106 5.245 5.385 5.526 5.669 5.812 5.956 6.1 6.245 6.39 6.534 6.678 6.821 6.963 7.104 7.243 7.38 7.515 7.648 7.777 7.904 8.027 8.147 8.262 8.373 8.479 8.58 8.674 8.763 8.845 8.919 8.986 9.044 9.094 9.135 9.166 9.187 9.198 9.2 9.2 9.196 9.188 9.177 9.161 9.142 9.119 9.093 9.064 9.032 8.997 8.958 8.918 8.874 8.828 8.78 8.729 8.677 8.622 8.565 8.507 8.447 8.385 8.322 8.257 8.191 8.124 8.056 7.987 7.917 7.846 7.774 7.702 7.628 7.555 7.481 7.406 7.331 7.256 7.18 7.104 7.029 6.953 6.877 6.8 6.724 6.649 6.573 6.497 6.422 6.346 6.271 6.197 6.122 6.048 5.975 5.901 5.828 5.756 5.684 5.612 5.541 5.471 5.401 5.331 5.263 5.194 5.127 5.059 4.993 4.927 4.861 4.797 4.732 4.669 4.606 4.544 4.482 4.421 4.361 4.301 4.242 4.184 4.126 4.069 4.012 3.957 3.902 3.847 3.793 3.74 3.687 3.635 3.584 3.533 3.483 3.434 3.385 3.337 3.289 3.242 3.196 3.15 3.105 3.06 3.016 2.973 2.93 2.887 2.846 2.804 2.764 2.724 2.684 2.645 2.607 2.569 2.531 2.494 2.458 2.422 2.386 2.351 2.317 2.283 2.249 2.216 2.184 2.152 2.12

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.36" PeakHeight="96.033" Num="3" Error="2.057">
-8.965 3.859 -0.927
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.36" EndFrequency="9.2" PeakHeight="353.003" Num="5" zHalfNm="214.005" Error="4.811">
-238.779 -19.153 5.05 -0.419 0.843
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.512" Depth="0.122"/>
<TopsideChapman PeakHeight="353.003" PeakDensity="1050124.1" PeakScaleHeight="103.274" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
