<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 05:20:00.000"
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 22 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, 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) 05:20:00</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">
FF202605202210520009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.933" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.199" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="6.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="335.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="335.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="375.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="366.562" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="311.017" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.598" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="79.504" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="14.872" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="42.466" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="71.890" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.010" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="36">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
335.000 335.000 335.000 335.000 335.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 365.000 365.000 370.000 375.000 375.000 380.000 385.000 390.000 396.358 403.689 412.232 422.318 434.404 449.151 467.547 491.138 522.485 566.166 631.245
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 69 72 69 69 72 72 72 72 72 72 72 69 72 69 69 69 72 69 72 69 69 72 72 69 69 48 51 60 57 0 51 0 63 63 51
</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 -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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="174">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.695 150.0 155.0 160.0 165.0 170.0 175.0 180.0 183.39 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 220.085 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 366.562 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0
</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 0.316 0.293 0.261 0.218 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.207 0.228 0.249 0.27 0.291 0.312 0.333 0.354 0.354 0.418 0.508 0.625 0.765 0.926 1.105 1.304 1.525 1.774 2.054 2.373 2.738 3.155 3.624 4.14 4.682 5.222 5.735 6.201 6.615 6.974 7.281 7.54 7.754 7.927 8.061 8.159 8.221 8.248 8.25 8.245 8.22 8.175 8.112 8.033 7.94 7.834 7.717 7.589 7.453 7.31 7.161 7.006 6.848 6.687 6.523 6.358 6.193 6.027 5.861 5.697 5.534 5.372 5.213 5.056 4.902 4.75 4.601 4.455 4.313 4.174 4.038 3.906 3.776 3.651 3.529 3.41 3.295 3.183 3.074 2.969 2.866 2.768 2.672 2.579 2.489 2.402 2.318 2.236 2.158 2.082 2.008 1.937 1.869 1.802 1.738 1.677 1.617 1.559 1.504 1.45 1.398 1.348 1.3 1.253 1.208 1.165 1.123 1.083 1.044 1.007 0.97 0.936 0.902 0.869 0.838 0.808 0.779 0.751 0.724 0.698 0.673 0.648 0.625 0.602 0.581 0.56 0.54 0.52 0.501 0.483 0.466 0.449 0.433 0.417 0.402 0.388 0.374 0.36 0.347 0.335 0.323 0.311 0.3 0.289 0.278 0.268 0.259 0.249 0.24 0.232 0.223 0.215 0.207

</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="8.25" PeakHeight="366.562" Num="5" zHalfNm="311.017" Error="5.383">
-155.753 18.023 -12.846 6.584 -2.485
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="110.085" Depth="0.154"/>
<TopsideChapman PeakHeight="366.562" PeakDensity="844447.9" PeakScaleHeight="42.466" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
