<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 18:50:00.000"
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: 90% PACIFIC flags: 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" >
2026.02.26 (057) 18:50:00</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">
FF202605702261850009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.300" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.370" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.415" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="225.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="225.000" 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="9.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="525.000" 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="2.840" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="387.492" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="260.292" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.599" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="166.525" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="50.815" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="89.108" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="200.530" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.410" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="127">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
225.000 230.000 230.000 230.000 233.571 237.143 240.714 244.286 247.857 251.429 255.000 260.000 260.000 262.500 265.000 267.500 270.000 270.000 272.500 275.000 277.500 280.000 282.500 285.000 287.500 290.000 295.000 290.000 295.000 300.000 305.000 305.000 305.000 310.000 312.500 315.000 317.500 320.000 320.000 325.000 325.000 327.500 330.000 335.000 335.000 340.000 340.000 345.000 345.000 347.500 350.000 355.000 355.000 360.000 362.500 365.000 365.000 368.333 371.667 375.000 375.000 375.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 395.000 400.000 400.000 400.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 430.000 430.000 435.000 435.000 440.000 440.000 450.000 455.000 455.000 460.000 460.000 470.000 475.000 475.000 480.000 480.000 490.000 490.000 495.000 500.000 505.000 505.000 510.000 510.000 515.000 520.000 525.000 525.000 535.000 535.000 540.000 545.000 550.000 555.000 560.000 570.000 575.000 580.000 586.261 593.115 600.650 608.973 618.215 628.535 640.136 653.271 668.267
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 0 54 0 0 0 0 0 0 51 48 54 0 0 0 48 45 0 0 0 0 0 0 0 57 51 57 0 0 48 57 60 60 0 63 0 60 63 63 63 0 60 57 60 60 60 60 60 0 57 51 57 51 0 51 57 0 0 48 57 63 60 66 60 66 69 69 72 69 63 66 69 66 60 51 63 54 63 60 54 66 60 63 66 63 63 60 63 63 60 60 60 63 63 63 60 60 63 60 57 57 60 57 54 57 57 57 54 57 57 57 57 54 54 54 57 54 51 54 48 51 51 51 0 0 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 -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 -1.953125 -0.390625 1.171875 -1.953125 -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 1.953125 -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 1.953125 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.573 90.0 95.0 100.0 105.0 110.0 113.947 115.0 117.894 120.0 121.841 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 387.492 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.235 1.909 2.458 2.748 2.84 2.718 2.718 2.718 2.783 2.84 2.917 3.041 3.17 3.305 3.446 3.595 3.75 3.912 4.08 4.254 4.433 4.614 4.797 4.98 5.162 5.342 5.52 5.695 5.866 6.034 6.199 6.361 6.52 6.676 6.829 6.98 7.128 7.275 7.419 7.562 7.703 7.842 7.981 8.118 8.254 8.389 8.523 8.657 8.789 8.921 9.052 9.182 9.312 9.439 9.565 9.689 9.809 9.923 10.03 10.126 10.206 10.265 10.296 10.3 10.299 10.293 10.281 10.263 10.239 10.21 10.176 10.138 10.094 10.047 9.995 9.939 9.879 9.816 9.749 9.679 9.607 9.532 9.454 9.373 9.291 9.206 9.12 9.032 8.942 8.851 8.759 8.665 8.571 8.475 8.379 8.282 8.185 8.087 7.989 7.891 7.792 7.693 7.595 7.496 7.397 7.299 7.201 7.104 7.006 6.91 6.813 6.717 6.622 6.528 6.434 6.34 6.248 6.156 6.065 5.975 5.885 5.797 5.709 5.622 5.536 5.451 5.367 5.284 5.202 5.121 5.04 4.961 4.883 4.805 4.729 4.654 4.579 4.506 4.433 4.362 4.291 4.221 4.153 4.085 4.018 3.952 3.888 3.824 3.761 3.699 3.637 3.577 3.518 3.459 3.402 3.345 3.289 3.234 3.18 3.127 3.074 3.023 2.972 2.922 2.872 2.824 2.776 2.729 2.683 2.637 2.593 2.549 2.505 2.463 2.421 2.38 2.339 2.299 2.26 2.221 2.183 2.146 2.109 2.073 2.038 2.003 1.969

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.84" PeakHeight="110.0" Num="3" Error="0.0">
-30.056 12.499 -2.87
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.84" EndFrequency="10.3" PeakHeight="387.492" Num="5" zHalfNm="260.292" Error="5.217">
-236.334 -47.479 28.91 -13.461 2.713
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="11.841" Depth="0.122"/>
<TopsideChapman PeakHeight="387.492" PeakDensity="1316253.1" PeakScaleHeight="89.108" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
