<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 05:50:00.000"
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 55 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 20% PACIFIC flags: Moderate F-spread, F2o cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2, Trace overlaps while constructing baseline</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) 05:50:00</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">
FF202609204020550009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="5.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.905" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="15.540" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="285.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="285.000" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="5.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="416.758" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="355.301" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="308.214" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.360" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="68.436" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="5.362" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="35.429" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="69.250" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.930" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="65">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.15 2.2 2.25 2.3 2.35 2.4 2.45 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
285.000 295.000 315.000 315.000 315.000 315.000 317.500 320.000 325.000 330.000 335.000 337.500 340.000 337.000 334.000 331.000 328.000 325.000 330.000 335.000 336.667 338.333 340.000 340.000 340.000 340.833 341.667 342.500 343.333 344.167 345.000 340.000 340.000 345.000 344.167 343.333 342.500 341.667 340.833 340.000 345.000 350.000 355.000 359.333 363.667 368.000 372.333 365.000 375.000 385.000 387.500 390.000 395.000 396.334 397.877 399.683 401.826 404.408 407.582 411.577 416.758 423.745 433.683 448.942 475.355
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 60 0 0 0 60 0 66 63 0 60 0 54 0 0 0 54 60 0 54 0 0 0 0 60 0 0 0 0 0 60 63 0 63 0 0 0 0 57 54 63 63 60 63 0 0 54 57 0 54 0 54 51 0 0 0 0 0 54 0 0 0 57 57 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 1.953125 0.390625 -2.734375 0.390625 -1.953125 0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 1.171875 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 1.171875 1.171875 0.390625 0.390625 0.390625 1.171875 0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -2.734375 -1.171875 0.390625 1.171875 0.390625 -0.390625 0.390625 -0.390625 -1.171875 -1.171875 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="143">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.166 150.0 155.0 160.0 165.0 170.0 175.0 180.0 182.331 185.0 190.0 195.0 200.0 205.0 210.0 215.0 218.497 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 355.301 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.345 0.333 0.315 0.291 0.258 0.213 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.211 0.233 0.254 0.275 0.297 0.318 0.339 0.354 0.375 0.457 0.553 0.664 0.79 0.931 1.086 1.255 1.439 1.636 1.847 2.07 2.306 2.553 2.809 3.073 3.341 3.611 3.878 4.138 4.386 4.616 4.824 5.003 5.149 5.258 5.325 5.35 5.35 5.341 5.313 5.268 5.208 5.134 5.048 4.953 4.849 4.738 4.621 4.5 4.376 4.249 4.121 3.992 3.863 3.735 3.608 3.482 3.359 3.237 3.118 3.002 2.889 2.778 2.671 2.566 2.465 2.368 2.273 2.181 2.093 2.008 1.926 1.846 1.77 1.697 1.626 1.558 1.493 1.431 1.37 1.313 1.257 1.204 1.153 1.104 1.057 1.012 0.969 0.928 0.888 0.85 0.814 0.779 0.746 0.714 0.683 0.654 0.626 0.599 0.573 0.548 0.525 0.502 0.481 0.46 0.44 0.421 0.403 0.386 0.369 0.353 0.338 0.323 0.31 0.296 0.283 0.271 0.26 0.248 0.238 0.227 0.218 0.208

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="5.35" PeakHeight="355.301" Num="5" zHalfNm="308.214" Error="2.181">
-134.756 -3.755 2.231 -0.385 -0.139
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="108.497" Depth="0.154"/>
<TopsideChapman PeakHeight="355.301" PeakDensity="355117.88" PeakScaleHeight="35.429" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
