<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 11:50:00.000"
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: 100%</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" >
2026.04.01 (091) 11:50:00</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">
FF202609104011150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="10.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.826" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.664" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="240.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="240.000" 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="10.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="445.000" 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="2.984" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.166" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="317.553" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="243.307" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.856" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="95.584" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="34.572" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="52.814" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="131.430" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.090" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="128">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 240.000 240.000 245.000 250.000 255.000 255.000 255.000 258.333 261.667 265.000 268.333 271.667 275.000 275.000 275.000 285.000 280.000 285.000 285.000 285.000 285.000 288.333 291.667 295.000 295.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 306.667 308.333 310.000 310.000 311.667 313.333 315.000 315.000 315.000 320.000 320.000 320.000 320.000 322.143 324.286 326.429 328.571 330.714 332.857 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 345.000 347.500 350.000 350.000 350.000 350.000 352.500 355.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 375.000 377.500 380.000 385.000 385.000 385.000 385.000 390.000 395.000 395.000 395.000 400.000 400.000 405.000 405.000 405.000 407.500 410.000 410.000 410.000 410.000 410.000 415.000 420.000 420.000 425.000 425.000 425.000 430.000 430.000 435.000 435.000 435.000 440.000 442.500 445.000 445.000 445.000 450.000 455.000 460.000 467.863 478.723
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 57 0 0 54 54 54 0 0 0 0 0 60 66 63 45 0 54 0 0 60 0 0 60 0 0 57 54 57 57 0 48 48 60 54 60 60 48 0 0 60 51 0 0 54 60 54 66 0 66 60 0 0 0 0 0 0 66 72 69 60 63 63 0 72 69 0 57 57 57 63 0 60 45 48 0 60 60 63 66 63 63 63 66 66 60 66 60 66 72 66 69 60 60 63 54 60 45 0 66 51 60 60 69 57 0 66 60 66 57 60 63 57 57 54 0 54 57 51 54 48 51 48 48 48 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 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 0.390625 0.390625 -0.390625 -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 -2.734375 -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 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 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 -1.171875 -1.171875 -1.953125
</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" >
89.548 90.0 95.0 100.0 105.0 110.0 113.287 115.0 116.574 119.861 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 317.553 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.237 2.006 2.583 2.887 2.984 2.862 2.862 2.862 2.984 2.989 3.162 3.326 3.485 3.643 3.803 3.965 4.13 4.299 4.472 4.65 4.833 5.02 5.212 5.408 5.608 5.812 6.019 6.228 6.44 6.654 6.87 7.088 7.306 7.526 7.747 7.969 8.193 8.418 8.645 8.873 9.103 9.336 9.571 9.807 10.045 10.281 10.507 10.704 10.831 10.85 10.848 10.83 10.794 10.742 10.676 10.595 10.502 10.398 10.282 10.158 10.025 9.884 9.736 9.583 9.425 9.262 9.096 8.927 8.756 8.583 8.408 8.233 8.058 7.883 7.708 7.534 7.361 7.189 7.019 6.851 6.685 6.521 6.359 6.199 6.043 5.888 5.737 5.588 5.442 5.299 5.159 5.022 4.887 4.756 4.627 4.502 4.379 4.259 4.142 4.028 3.917 3.808 3.702 3.599 3.498 3.4 3.304 3.211 3.121 3.032 2.947 2.863 2.782 2.702 2.625 2.55 2.478 2.407 2.338 2.271 2.206 2.142 2.081 2.021 1.963 1.906 1.851 1.798 1.746 1.695 1.646 1.599 1.553 1.508 1.464 1.422 1.38 1.34 1.302 1.264 1.227 1.192 1.157 1.123 1.091 1.059 1.028 0.998 0.969 0.941 0.914 0.887 0.861 0.836 0.812 0.788 0.765 0.743 0.722 0.701 0.68 0.66 0.641 0.622 0.604 0.587 0.57 0.553 0.537 0.521 0.506 0.491 0.477 0.463 0.45 0.437 0.424 0.412 0.4 0.388 0.377 0.366 0.355 0.345 0.335 0.325 0.315

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.984" PeakHeight="110.0" Num="3" Error="0.0">
-30.182 12.683 -2.953
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.984" EndFrequency="10.85" PeakHeight="317.553" Num="5" zHalfNm="243.307" Error="2.95">
-153.904 -58.718 18.453 -5.421 1.898
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.861" Depth="0.122"/>
<TopsideChapman PeakHeight="317.553" PeakDensity="1460576.9" PeakScaleHeight="52.814" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
