<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 00:30:00.000"
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: 80% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, 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" >
2026.02.28 (059) 00:30:00</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">
FF202605902280030009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.762" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.406" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="385.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="385.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="482.378" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="412.730" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="374.732" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.548" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="59.442" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="13.507" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="28.036" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="73.520" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.110" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="101">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
385.000 397.500 410.000 420.000 430.000 440.000 420.000 425.000 440.000 440.000 440.000 440.000 437.500 435.000 433.333 431.667 430.000 430.000 430.000 430.000 422.500 415.000 395.000 396.053 397.105 398.158 399.211 400.263 401.316 402.368 403.421 404.474 405.526 406.579 407.632 408.684 409.737 410.789 411.842 412.895 413.947 415.000 418.750 422.500 426.250 430.000 435.000 435.000 440.000 439.000 438.000 437.000 436.000 435.000 420.000 435.000 435.000 435.000 435.000 440.000 436.667 433.333 430.000 431.250 432.500 433.750 435.000 440.000 445.000 445.000 445.000 447.500 450.000 450.500 451.000 451.500 452.000 452.500 453.000 453.500 454.000 454.500 455.000 465.000 467.500 470.000 470.500 471.000 471.500 472.000 472.500 473.000 473.406 473.878 474.436 475.104 475.920 476.936 478.239 479.969 482.378
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 54 54 57 54 54 57 54 0 0 54 0 51 60 0 54 54 0 57 0 57 51 0 0 0 0 51 0 0 0 0 0 48 0 0 0 0 0 0 0 51 0 0 0 54 54 54 54 0 0 57 0 54 54 54 51 0 51 57 0 0 54 0 0 0 48 0 54 51 48 0 51 48 0 48 51 51 51 57 57 0 45 54 0 54 48 0 54 45 0 48 51 0 48 48 0 0 0 45 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 1.171875 0.390625 -0.390625 -1.171875 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 1.953125 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 2.734375 0.390625 -0.390625 0.390625 -0.390625 1.953125 -0.390625 -1.953125 -0.390625 2.734375 -1.953125 -1.171875 -1.171875 2.734375 -2.734375 1.953125 -1.953125 1.171875 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 0.390625 -0.390625 -1.953125 -2.734375 -0.390625 -1.171875 -1.953125 -2.734375 0.390625 -0.390625 -2.734375 0.390625 -1.953125 1.953125 -1.171875 -0.390625 -0.390625 -1.171875 1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.953125 -1.171875 -1.953125 -1.953125 -2.734375 0.390625 -1.171875 -1.953125 -1.953125 -2.734375 1.953125 -1.953125 0.390625 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -2.734375 -2.734375 1.953125 1.953125 -1.953125 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="147">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.267 150.0 155.0 160.0 165.0 170.0 175.0 180.0 182.533 185.0 190.0 195.0 200.0 205.0 210.0 215.0 218.8 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 412.73 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0
</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 0.315 0.291 0.259 0.214 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.21 0.232 0.253 0.274 0.295 0.317 0.338 0.354 0.369 0.443 0.536 0.648 0.777 0.917 1.066 1.22 1.379 1.542 1.709 1.88 2.054 2.232 2.414 2.6 2.791 2.988 3.189 3.396 3.609 3.829 4.056 4.29 4.533 4.784 5.044 5.315 5.597 5.892 6.2 6.523 6.863 7.222 7.601 8.0 8.416 8.826 9.142 9.2 9.194 9.143 9.044 8.904 8.729 8.525 8.298 8.052 7.793 7.523 7.248 6.968 6.688 6.409 6.134 5.863 5.597 5.339 5.088 4.844 4.609 4.383 4.166 3.957 3.757 3.566 3.383 3.208 3.042 2.883 2.732 2.589 2.452 2.323 2.2 2.083 1.972 1.867 1.767 1.672 1.583 1.498 1.417 1.341 1.269 1.201 1.136 1.075 1.017 0.962 0.91 0.861 0.814 0.77 0.728 0.689 0.652 0.617 0.583 0.552 0.522 0.493 0.467 0.441 0.418 0.395 0.374 0.353 0.334 0.316 0.299 0.283 0.267 0.253 0.239 0.226 0.214 0.202

</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="9.2" PeakHeight="412.73" Num="5" zHalfNm="374.732" Error="3.349">
-163.499 -55.664 35.257 -10.911 0.887
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="108.8" Depth="0.154"/>
<TopsideChapman PeakHeight="412.73" PeakDensity="1050124.1" PeakScaleHeight="28.036" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
