<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-08 -098 08:10:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 50% PACIFIC flags: Moderate F-spread, F2o cusp not found, 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" >
2026.04.08 (098) 08:10:00</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">
FF202609804080810009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="4.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.026" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="14.980" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="4.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="365.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="365.000" 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="84" Val="912.500" Name="QF" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="4.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="365.000" 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="0.373" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="335.231" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="286.846" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.125" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="70.090" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="4.688" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="36.160" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="70.830" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.940" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="8">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
365.000 392.500 420.000 420.000 420.000 420.000 420.000 441.353
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
15 0 12 0 0 0 12 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
2.734375 0.390625 1.171875 -1.171875 0.390625 0.390625 -2.734375 2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="139">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.118 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.715 140.0 145.0 150.0 155.0 160.0 165.0 169.431 170.0 175.0 180.0 185.0 190.0 195.0 199.146 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 335.231 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.246 0.323 0.361 0.373 0.369 0.358 0.337 0.307 0.262 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.203 0.232 0.262 0.291 0.32 0.349 0.373 0.388 0.473 0.564 0.665 0.778 0.905 1.049 1.21 1.387 1.58 1.786 2.003 2.229 2.461 2.698 2.937 3.176 3.413 3.647 3.873 4.088 4.29 4.473 4.634 4.766 4.865 4.928 4.95 4.95 4.942 4.917 4.876 4.822 4.756 4.68 4.594 4.501 4.401 4.296 4.187 4.075 3.961 3.845 3.728 3.611 3.495 3.379 3.265 3.152 3.041 2.932 2.826 2.722 2.62 2.521 2.425 2.332 2.242 2.154 2.07 1.988 1.909 1.832 1.759 1.688 1.619 1.554 1.49 1.429 1.371 1.314 1.26 1.208 1.158 1.11 1.064 1.02 0.977 0.936 0.897 0.86 0.824 0.789 0.756 0.724 0.694 0.665 0.637 0.61 0.584 0.56 0.536 0.514 0.492 0.471 0.451 0.432 0.414 0.397 0.38 0.364 0.349 0.334 0.32 0.306 0.293 0.281 0.269 0.258 0.247 0.236 0.226 0.217 0.208

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.373" PeakHeight="110.0" Num="3" Error="0.0">
-19.43 2.721 -0.173
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.373" EndFrequency="4.95" PeakHeight="335.231" Num="5" zHalfNm="286.846" Error="1.981">
-133.85 -4.307 2.702 -1.407 0.777
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="89.146" Depth="0.173"/>
<TopsideChapman PeakHeight="335.231" PeakDensity="304001.25" PeakScaleHeight="36.16" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
