<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-24 -055 00:10:00.000"
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: 40% 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, 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" >
2026.02.24 (055) 00:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605502240010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.300" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.897" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.943" 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="9.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="325.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="325.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="441.061" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="365.857" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="328.552" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.758" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="55.576" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="13.156" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="28.222" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="59.980" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.420" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="125">
<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 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
375.000 365.000 360.000 355.000 350.000 345.000 340.000 335.000 330.000 325.000 325.000 325.000 325.000 327.000 329.000 331.000 333.000 335.000 338.333 341.667 345.000 345.000 343.333 341.667 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 342.500 345.000 343.333 341.667 340.000 340.000 340.000 340.000 337.500 335.000 333.333 331.667 330.000 330.000 335.000 340.000 335.000 335.000 336.250 337.500 338.750 340.000 340.000 340.000 341.250 342.500 343.750 345.000 346.250 347.500 348.750 350.000 351.250 352.500 353.750 355.000 356.250 357.500 358.750 360.000 361.250 362.500 363.750 365.000 370.000 370.000 370.000 370.000 370.000 370.000 373.333 376.667 380.000 380.000 380.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 392.500 395.000 400.000 405.000 400.000 400.000 400.000 405.000 405.000 405.000 410.000 415.000 420.000 420.000 425.000 425.000 430.000 435.000 430.000 430.000 430.000 435.000 435.648 436.602 438.144 441.061 448.673
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 0 54 0 0 0 0 0 57 51 0 60 0 0 0 0 48 0 0 48 57 54 0 54 0 60 57 57 57 54 57 0 57 0 0 54 51 0 54 0 63 60 0 60 60 60 60 66 60 0 0 0 60 57 63 66 0 63 63 0 0 57 0 60 57 60 57 0 63 57 63 54 0 0 60 60 60 60 0 63 60 0 0 63 0 60 63 63 63 63 60 60 57 63 69 66 63 66 63 63 66 66 63 57 63 60 57 57 60 63 63 60 60 63 57 57 54 54 51 54 54 45 0 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
1.953125 2.734375 1.953125 1.953125 1.171875 -0.390625 -1.953125 -0.390625 -1.953125 -0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 -1.171875 1.171875 -1.171875 1.171875 -0.390625 2.734375 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.171875 0.390625 0.390625 1.171875 -1.171875 0.390625 -1.171875 -1.953125 0.390625 -0.390625 -1.171875 2.734375 -1.171875 -1.171875 1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.953125 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 1.953125 -0.390625 -1.171875 -1.171875 1.171875 -1.171875 -1.171875 1.953125 1.953125 -1.171875 1.953125 0.390625 1.171875 -0.390625 -1.171875 0.390625 0.390625 0.390625 0.390625 -1.171875 1.953125 -0.390625 -2.734375 -0.390625 1.953125 0.390625 -1.171875 0.390625 0.390625 1.171875 -1.171875 0.390625 0.390625 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 1.953125 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 1.953125 -2.734375 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="138">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.817 150.0 155.0 160.0 165.0 170.0 175.0 180.0 181.635 185.0 190.0 195.0 200.0 205.0 210.0 215.0 217.452 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 365.857 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0
</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 0.314 0.289 0.256 0.209 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.214 0.236 0.257 0.279 0.3 0.322 0.343 0.354 0.403 0.517 0.65 0.796 0.953 1.12 1.3 1.491 1.696 1.916 2.152 2.405 2.678 2.971 3.286 3.626 3.99 4.382 4.801 5.247 5.72 6.214 6.725 7.241 7.748 8.224 8.644 8.979 9.204 9.298 9.3 9.281 9.211 9.096 8.942 8.756 8.543 8.308 8.056 7.792 7.519 7.241 6.96 6.679 6.4 6.124 5.853 5.589 5.331 5.081 4.838 4.605 4.379 4.163 3.955 3.756 3.566 3.384 3.21 3.045 2.887 2.737 2.594 2.458 2.329 2.206 2.089 1.979 1.874 1.774 1.68 1.591 1.506 1.425 1.349 1.277 1.209 1.144 1.083 1.025 0.97 0.918 0.868 0.822 0.778 0.736 0.696 0.659 0.623 0.59 0.558 0.528 0.5 0.473 0.447 0.423 0.401 0.379 0.359 0.339 0.321 0.304 0.287 0.272 0.257 0.243 0.23 0.218 0.206

</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="9.3" PeakHeight="365.857" Num="5" zHalfNm="328.552" Error="3.995">
-135.19 -22.314 9.896 -0.038 -0.759
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="107.452" Depth="0.154"/>
<TopsideChapman PeakHeight="365.857" PeakDensity="1073076.9" PeakScaleHeight="28.222" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
