<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 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" >
2026.02.21 (052) 00:00:00</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">
FF202605202210000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.090" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.190" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.750" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.750" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.150" 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="1.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="380.000" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.750" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.750" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="336.760" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="294.999" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.861" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="60.813" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="12.687" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="31.259" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="58.950" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.190" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="102">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
285.000 286.667 288.333 290.000 290.000 290.000 290.000 292.500 295.000 290.000 295.000 295.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 307.500 310.000 310.000 312.500 315.000 315.000 315.000 315.000 315.000 315.000 315.000 316.250 317.500 318.750 320.000 321.250 322.500 323.750 325.000 320.000 321.250 322.500 323.750 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 335.000 340.000 343.333 346.667 350.000 355.000 353.333 351.667 350.000 352.500 355.000 355.833 356.667 357.500 358.333 359.167 360.000 375.000 375.000 376.500 378.000 379.500 381.000 382.500 384.000 385.500 387.000 388.500 390.000 385.000 385.000 382.500 380.000 380.000 387.169 396.460 408.977 426.756 453.994
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 0 0 0 0 57 60 0 72 51 66 66 60 0 0 0 0 0 66 69 69 66 66 69 69 75 0 78 0 75 72 0 66 72 0 66 69 72 75 75 75 75 0 0 0 0 0 0 0 54 54 0 0 0 66 63 60 57 60 60 60 0 57 0 60 0 0 57 57 0 0 57 0 57 0 0 0 0 0 60 60 54 0 0 51 0 54 51 0 51 0 57 54 51 51 66 66 72 51 0 0 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 0.390625 -0.390625 -2.734375 -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 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.953125 -1.171875 -0.390625 -1.171875 2.734375 1.171875 -0.390625 1.953125 -0.390625 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 2.734375 1.953125 1.171875 1.171875 -1.953125 1.953125 1.953125 1.953125 -2.734375 1.953125 -1.171875 1.953125 1.953125 1.953125 1.953125 2.734375 2.734375 1.953125 1.953125 1.953125 2.734375 1.953125 1.953125 1.953125 1.953125 1.171875 2.734375 1.953125 2.734375 1.953125 2.734375 1.953125 1.953125 0.390625 0.390625 0.390625 1.953125 2.734375 2.734375 2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="140">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.55 150.0 155.0 160.0 165.0 170.0 175.0 180.0 181.1 185.0 190.0 195.0 200.0 205.0 210.0 215.0 216.65 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 336.76 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0
</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 0.288 0.254 0.206 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.217 0.239 0.26 0.282 0.304 0.325 0.347 0.354 0.432 0.559 0.71 0.894 1.123 1.404 1.742 2.136 2.579 3.06 3.569 4.096 4.633 5.171 5.703 6.223 6.721 7.188 7.616 7.993 8.309 8.554 8.718 8.794 8.8 8.791 8.744 8.66 8.544 8.4 8.233 8.046 7.844 7.628 7.403 7.171 6.934 6.695 6.455 6.215 5.977 5.743 5.512 5.286 5.066 4.851 4.642 4.44 4.245 4.056 3.874 3.698 3.53 3.368 3.212 3.063 2.92 2.783 2.653 2.527 2.408 2.293 2.184 2.08 1.981 1.886 1.795 1.709 1.627 1.548 1.474 1.403 1.335 1.27 1.209 1.15 1.094 1.041 0.991 0.943 0.897 0.853 0.812 0.772 0.735 0.699 0.665 0.633 0.602 0.573 0.545 0.518 0.493 0.469 0.446 0.424 0.404 0.384 0.365 0.348 0.331 0.314 0.299 0.285 0.271 0.258 0.245 0.233 0.222 0.211 0.201

</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="8.8" PeakHeight="336.76" Num="5" zHalfNm="294.999" Error="1.928">
-123.166 3.506 -0.099 -1.163 0.812
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="106.65" Depth="0.154"/>
<TopsideChapman PeakHeight="336.76" PeakDensity="960794.06" PeakScaleHeight="31.259" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
