<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 09:10:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 100%</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" >
2026.02.23 (054) 09:10:00</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">
FF202605402230910009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.198" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.585" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="235.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="235.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="331.014" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.186" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="288.513" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="225.003" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="4.619" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="90.964" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="11.868" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="50.076" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="76.870" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.740" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="89">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 240.000 238.333 236.667 235.000 235.000 235.000 235.000 235.000 235.000 235.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 242.000 244.000 246.000 248.000 250.000 250.000 250.000 250.000 250.000 250.000 255.000 255.000 255.000 255.000 255.000 257.500 260.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 270.000 270.000 270.000 270.000 270.000 275.000 275.000 275.000 275.000 277.500 280.000 282.500 285.000 287.500 290.000 290.000 290.000 291.667 293.333 295.000 305.000 305.000 305.000 310.000 315.000 315.000 320.000 322.209 324.729 327.633 331.014 335.000 339.771 345.583 352.819 362.075 374.333 391.339 416.513 457.596 536.643
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 57 0 0 60 0 0 0 0 51 48 63 63 63 0 63 63 63 63 63 60 57 54 51 69 0 0 66 66 0 66 66 66 63 0 0 0 75 0 69 0 75 0 75 69 0 0 0 66 72 75 75 72 72 0 72 69 0 0 0 0 0 69 72 72 0 0 69 60 69 72 69 66 72 69 69 66 69 69 69 69 66 69 60 60 54 60 66 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 -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 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 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 1.171875 1.171875 2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="173">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.112 95.0 100.0 105.0 110.0 115.0 120.0 124.052 125.0 130.0 135.0 138.104 140.0 145.0 150.0 152.156 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 288.513 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.791 1.027 1.148 1.186 1.166 1.103 1.016 1.016 1.016 1.016 1.016 1.039 1.099 1.16 1.186 1.281 1.45 1.622 1.796 1.975 2.162 2.359 2.57 2.8 3.052 3.333 3.648 3.999 4.381 4.773 5.144 5.472 5.75 5.981 6.171 6.326 6.451 6.551 6.629 6.686 6.725 6.746 6.75 6.749 6.739 6.717 6.684 6.64 6.586 6.524 6.454 6.377 6.294 6.205 6.11 6.012 5.91 5.804 5.696 5.586 5.474 5.36 5.246 5.131 5.016 4.901 4.786 4.672 4.559 4.446 4.335 4.225 4.117 4.01 3.904 3.801 3.699 3.599 3.501 3.404 3.31 3.218 3.128 3.04 2.953 2.869 2.787 2.707 2.629 2.553 2.478 2.406 2.336 2.267 2.2 2.135 2.072 2.011 1.951 1.893 1.836 1.781 1.728 1.676 1.626 1.577 1.529 1.483 1.438 1.395 1.353 1.312 1.272 1.234 1.196 1.16 1.124 1.09 1.057 1.025 0.994 0.963 0.934 0.905 0.878 0.851 0.825 0.8 0.775 0.752 0.729 0.706 0.685 0.664 0.643 0.624 0.605 0.586 0.568 0.551 0.534 0.518 0.502 0.486 0.471 0.457 0.443 0.429 0.416 0.403 0.391 0.379 0.367 0.356 0.345 0.335 0.324 0.314 0.305 0.295 0.286 0.277 0.269 0.261 0.253 0.245 0.237 0.23 0.223 0.216 0.21 0.203

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.186" PeakHeight="110.0" Num="3" Error="0.0">
-27.233 8.813 -1.468
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.186" EndFrequency="6.75" PeakHeight="288.513" Num="5" zHalfNm="225.003" Error="2.503">
-144.546 16.742 -14.638 7.556 -1.471
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="42.156" Depth="0.17"/>
<TopsideChapman PeakHeight="288.513" PeakDensity="565291.56" PeakScaleHeight="50.076" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
