<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-11 -042 00:00:00.000"
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 33 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2</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" >
2026.02.11 (042) 00:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.14" 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">
FF202604202110000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.100" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.115" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.115" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="305.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="305.000" 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="0.550" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="376.650" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.100" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.100" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="334.524" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="301.083" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.861" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="49.617" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.771" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="24.905" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="52.990" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.590" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="76">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
330.000 325.000 310.000 309.615 309.231 308.846 308.462 308.077 307.692 307.308 306.923 306.538 306.154 305.769 305.385 305.000 310.000 320.000 325.000 320.000 325.000 325.000 325.000 325.000 325.000 330.000 332.500 335.000 335.000 335.000 337.500 340.000 340.000 340.000 340.000 340.000 342.500 345.000 345.556 346.111 346.667 347.222 347.778 348.333 348.889 349.444 350.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 360.000 365.000 370.000 370.000 372.500 375.000 370.000 370.000 370.406 370.898 371.505 372.275 373.283 374.659 376.650 379.785 385.452 398.792 468.035
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 63 0 0 0 0 0 63 0 0 0 0 0 0 57 51 60 63 66 63 0 63 0 66 63 63 57 66 66 63 0 63 0 57 0 69 0 66 0 66 63 69 60 57 0 66 66 63 66 66 66 0 0 0 66 0 54 63 0 57 63 0 57 60 60 66 60 66 63 66 0 63 69 60 0 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 1.171875 0.390625 1.171875 0.390625 1.171875 0.390625 -1.171875 1.171875 0.390625 0.390625 1.171875 0.390625 1.171875 0.390625 0.390625 0.390625 0.390625 -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 0.390625 1.171875 -0.390625 -0.390625 1.171875 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 1.171875 1.171875 1.953125 1.171875 1.171875 1.171875 1.171875 0.390625 1.171875 0.390625 0.390625 -0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="118">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.445 150.0 155.0 160.0 165.0 170.0 175.0 180.0 180.891 185.0 190.0 195.0 200.0 205.0 210.0 215.0 216.336 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 334.524 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.344 0.332 0.313 0.288 0.253 0.205 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.218 0.24 0.261 0.283 0.305 0.326 0.348 0.354 0.424 0.538 0.678 0.845 1.04 1.261 1.507 1.775 2.061 2.366 2.688 3.026 3.379 3.748 4.13 4.526 4.931 5.344 5.756 6.157 6.525 6.832 7.036 7.1 7.1 7.068 6.988 6.868 6.713 6.531 6.328 6.109 5.878 5.639 5.397 5.154 4.912 4.673 4.439 4.212 3.991 3.777 3.572 3.376 3.187 3.008 2.837 2.674 2.52 2.373 2.234 2.103 1.979 1.862 1.752 1.647 1.549 1.456 1.369 1.287 1.209 1.137 1.068 1.004 0.943 0.886 0.832 0.782 0.735 0.69 0.648 0.609 0.572 0.537 0.505 0.474 0.445 0.418 0.393 0.369 0.347 0.326 0.306 0.287 0.27 0.253 0.238 0.223 0.21

</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="7.1" PeakHeight="334.524" Num="5" zHalfNm="301.083" Error="1.764">
-109.285 -14.908 8.694 -3.259 0.57
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="106.336" Depth="0.154"/>
<TopsideChapman PeakHeight="334.524" PeakDensity="625434.25" PeakScaleHeight="24.905" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
