<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-12 -043 23:40:00.000"
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" >
2026.02.12 (043) 23:40:00</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">
FF202604302122340009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.741" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="18.088" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.750" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.750" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="355.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="355.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="481.166" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.750" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.750" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="411.811" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="374.300" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.064" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="58.331" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.955" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="27.772" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="75.120" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="78">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
355.000 380.000 385.000 390.000 393.000 396.000 399.000 402.000 405.000 405.000 406.250 407.500 408.750 410.000 410.000 410.000 416.667 423.333 430.000 431.250 432.500 433.750 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 440.000 445.000 450.000 455.000 460.000 460.000 460.000 465.000 465.000 465.170 465.364 465.587 465.847 466.153 466.519 466.964 467.516 468.221 469.152 470.438 472.330 475.387 481.166 496.219
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 57 0 57 0 0 0 0 57 60 0 0 0 54 54 57 0 0 57 0 0 0 48 48 0 0 0 0 0 0 0 54 0 0 0 0 0 0 0 0 0 0 0 0 51 0 51 0 54 0 0 54 0 51 0 0 0 0 48 48 51 57 57 0 0 0 0 0 0 0 51 0 0 0 0 0 48 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 1.953125 1.953125 1.171875 2.734375 1.171875 -0.390625 1.171875 1.171875 0.390625 -1.171875 1.171875 -0.390625 1.953125 -0.390625 1.953125 -1.171875 0.390625 -0.390625 -1.171875 2.734375 -1.171875 -0.390625 -1.953125 1.953125 -0.390625 1.171875 -1.171875 -2.734375 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 2.734375 -1.171875 -1.953125 0.390625 -0.390625 -1.171875 -1.953125 -1.171875 2.734375 -0.390625 1.953125 -1.953125 -2.734375 -1.953125 2.734375 -1.171875 0.390625 -1.171875 -0.390625 -1.171875 2.734375 -1.171875 1.171875 -0.390625 -0.390625 0.390625 -1.953125 -1.171875 -0.390625 -2.734375 1.953125 -1.171875 -1.953125 -2.734375 1.171875 -0.390625 0.390625 1.953125 2.734375 -1.953125 -2.734375 -1.171875 -1.171875
</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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.911 145.0 150.0 155.0 160.0 165.0 170.0 175.0 179.821 180.0 185.0 190.0 195.0 200.0 205.0 210.0 214.732 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 411.811 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0
</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 0.331 0.312 0.286 0.25 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.201 0.223 0.245 0.267 0.289 0.311 0.333 0.354 0.357 0.419 0.493 0.577 0.668 0.764 0.864 0.966 1.071 1.178 1.287 1.398 1.512 1.629 1.748 1.87 1.996 2.125 2.257 2.394 2.534 2.68 2.83 2.985 3.145 3.312 3.485 3.665 3.853 4.05 4.256 4.472 4.7 4.94 5.196 5.467 5.756 6.06 6.361 6.579 6.6 6.592 6.547 6.469 6.362 6.23 6.078 5.91 5.73 5.54 5.343 5.142 4.94 4.737 4.536 4.337 4.142 3.952 3.766 3.586 3.412 3.244 3.083 2.928 2.779 2.637 2.501 2.371 2.247 2.13 2.017 1.911 1.809 1.713 1.621 1.534 1.452 1.374 1.3 1.23 1.163 1.1 1.041 0.984 0.931 0.88 0.832 0.787 0.744 0.704 0.665 0.629 0.595 0.562 0.532 0.503 0.475 0.449 0.425 0.401 0.38 0.359 0.339 0.321 0.303 0.287 0.271 0.256 0.242 0.229 0.216 0.204

</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="6.6" PeakHeight="411.811" Num="5" zHalfNm="374.3" Error="2.524">
-159.12 -63.821 33.475 -7.733 0.12
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="104.732" Depth="0.154"/>
<TopsideChapman PeakHeight="411.811" PeakDensity="540446.6" PeakScaleHeight="27.772" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
