<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 08:40:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: F2x cusp not found, One of F2 cusps was derived from the other</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" >
2026.02.22 (053) 08:40:00</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">
FF202605302220840009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="3.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.177" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="10.642" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="3.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="280.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="280.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="3.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="317.002" 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="0.607" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="309.763" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="241.026" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.662" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="99.266" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="3.162" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="55.164" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="83.070" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="4.410" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="16">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
280.000 280.000 283.362 287.158 291.479 296.440 302.196 308.954 317.002 326.746 338.788 354.048 374.014 401.261 440.661 502.675
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 72 72 72 72 75 72 69 69 66 63 63 63 0 0 57
</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 -1.171875 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="166">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
91.077 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 136.434 140.0 145.0 150.0 155.0 160.0 162.868 165.0 170.0 175.0 180.0 185.0 189.302 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 309.763 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.402 0.526 0.588 0.607 0.598 0.572 0.526 0.453 0.334 0.284 0.284 0.284 0.284 0.284 0.284 0.284 0.31 0.371 0.432 0.493 0.554 0.607 0.616 0.704 0.84 0.994 1.145 1.296 1.454 1.627 1.827 2.06 2.317 2.554 2.741 2.882 2.99 3.075 3.143 3.198 3.242 3.277 3.305 3.325 3.339 3.347 3.35 3.35 3.347 3.339 3.326 3.309 3.288 3.263 3.235 3.203 3.168 3.131 3.091 3.05 3.006 2.961 2.914 2.866 2.817 2.767 2.717 2.666 2.614 2.563 2.511 2.459 2.407 2.356 2.304 2.253 2.203 2.153 2.103 2.054 2.006 1.958 1.911 1.865 1.819 1.774 1.73 1.687 1.644 1.603 1.562 1.522 1.483 1.445 1.407 1.37 1.335 1.3 1.265 1.232 1.199 1.167 1.136 1.106 1.076 1.047 1.019 0.992 0.965 0.939 0.913 0.888 0.864 0.841 0.818 0.795 0.774 0.752 0.732 0.712 0.692 0.673 0.655 0.636 0.619 0.602 0.585 0.569 0.553 0.538 0.523 0.509 0.495 0.481 0.468 0.455 0.442 0.43 0.418 0.406 0.395 0.384 0.373 0.363 0.353 0.343 0.333 0.324 0.315 0.306 0.298 0.29 0.281 0.274 0.266 0.259 0.251 0.244 0.238 0.231 0.224 0.218 0.212 0.206 0.2

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.607" PeakHeight="110.0" Num="3" Error="0.0">
-23.75 5.423 -0.596
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.607" EndFrequency="3.35" PeakHeight="309.763" Num="5" zHalfNm="241.026" Error="3.138">
-146.951 42.04 -22.377 10.393 -3.566
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="79.302" Depth="0.323"/>
<TopsideChapman PeakHeight="309.763" PeakDensity="139236.97" PeakScaleHeight="55.164" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
