<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 15:30:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 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" >
2026.04.03 (093) 15:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609304031530009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="13.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.444" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="33.241" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.450" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.050" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.260" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="300.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="300.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="103.070" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="96.918" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="6.750" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="510.000" 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="3.388" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.450" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.450" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.359" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="384.726" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="278.709" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.687" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="142.841" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="78.167" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="77.622" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="179.020" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.270" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="164">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35 12.4 12.45 12.5 12.55 12.6 12.65 12.7 12.75 12.8 12.85 12.9 12.95 13.0 13.05 13.1 13.15 13.2 13.25 13.3 13.35 13.4 13.45 13.5 13.55 13.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
300.000 300.000 305.000 306.667 308.333 310.000 310.000 315.000 315.000 315.000 320.000 320.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 360.000 365.000 363.333 361.667 360.000 365.000 365.000 365.000 370.000 370.000 370.000 370.000 370.000 372.500 375.000 377.500 380.000 382.500 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 397.500 400.000 402.500 405.000 405.000 405.000 405.000 405.000 407.500 410.000 412.500 415.000 415.000 415.000 420.000 421.667 423.333 425.000 426.667 428.333 430.000 430.000 430.000 430.000 430.000 430.000 432.500 435.000 440.000 445.000 446.667 448.333 450.000 451.667 453.333 455.000 455.000 460.000 461.250 462.500 463.750 465.000 467.500 470.000 475.000 480.000 482.500 485.000 490.000 490.000 485.000 495.000 500.000 505.000 505.000 510.000 510.000 515.000 510.000 525.000 525.000 530.000 535.000 535.000 540.000 545.000 550.000 555.000 560.000 560.000 565.000 570.000 575.000 580.121 585.834 592.248 599.502 607.771 617.285 628.348 641.370
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 54 0 0 54 51 54 54 51 54 54 51 0 57 57 57 51 54 54 57 54 54 54 57 57 57 57 57 54 57 60 60 60 60 57 60 63 63 0 60 63 0 66 63 63 63 54 51 69 66 63 63 51 0 0 63 69 66 66 63 45 63 66 66 45 69 0 63 45 54 57 66 66 69 63 63 69 57 60 66 63 66 57 66 51 60 57 66 54 63 42 63 51 60 0 60 57 0 0 51 0 0 45 0 57 42 51 54 0 51 54 42 0 0 0 0 0 51 54 51 0 0 0 51 0 51 51 51 45 51 48 51 0 51 51 45 51 51 51 51 0 48 51 48 48 48 51 51 51 45 42 48 45 48 45 45 42 0 45 0 42 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 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 -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 -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 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.171875 -1.171875 1.953125 -1.171875 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.953125 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="5">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.05 3.1 3.15 3.2 3.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
103.070 104.022 105.128 106.454 108.122
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 48 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
2.734375 -2.734375 0.390625 -0.390625 -1.171875
</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" >
90.0 95.0 96.918 98.477 100.0 100.036 101.595 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 384.726 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 3.123 3.26 3.142 3.142 3.142 3.26 3.397 3.569 3.725 3.873 4.017 4.159 4.301 4.443 4.586 4.73 4.877 5.027 5.18 5.336 5.496 5.66 5.827 5.999 6.175 6.355 6.539 6.726 6.918 7.114 7.313 7.516 7.722 7.931 8.142 8.356 8.571 8.789 9.009 9.229 9.451 9.674 9.898 10.122 10.347 10.572 10.797 11.022 11.246 11.47 11.692 11.912 12.129 12.343 12.551 12.752 12.943 13.121 13.279 13.413 13.516 13.58 13.6 13.6 13.594 13.577 13.551 13.514 13.469 13.415 13.352 13.282 13.204 13.12 13.029 12.931 12.829 12.72 12.607 12.49 12.368 12.243 12.114 11.982 11.847 11.709 11.569 11.427 11.284 11.139 10.993 10.845 10.697 10.548 10.399 10.25 10.1 9.951 9.801 9.652 9.504 9.356 9.209 9.062 8.916 8.772 8.628 8.486 8.345 8.205 8.066 7.929 7.793 7.659 7.526 7.394 7.265 7.137 7.01 6.885 6.762 6.64 6.52 6.402 6.286 6.171 6.058 5.946 5.836 5.728 5.622 5.517 5.414 5.313 5.213 5.115 5.018 4.923 4.83 4.738 4.648 4.56 4.473 4.387 4.303 4.221 4.139 4.06 3.982 3.905 3.829 3.755 3.682 3.611 3.541 3.472 3.405 3.338 3.273 3.209 3.147 3.085 3.025 2.966 2.908 2.851 2.795 2.74 2.686 2.633 2.582 2.531 2.481 2.432 2.384 2.337 2.291 2.246 2.202 2.158 2.116 2.074 2.033 1.993 1.953 1.915 1.877

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.26" PeakHeight="96.918" Num="3" Error="2.099">
-10.262 4.391 -1.047
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.26" EndFrequency="13.6" PeakHeight="384.726" Num="5" zHalfNm="278.709" Error="6.652">
-234.929 -64.948 17.633 -3.81 2.923
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.677" Depth="0.118"/>
<TopsideChapman PeakHeight="384.726" PeakDensity="2294789.0" PeakScaleHeight="77.622" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
