<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 19:30:00.000"
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 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" >
2026.04.01 (091) 19:30:00</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">
FF202609104011930009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="12.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.490" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.247" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="260.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="260.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="512.000" 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="2.483" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="389.924" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="294.356" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.075" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="132.273" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="60.316" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="70.493" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="156.270" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.390" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="169">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
260.000 265.000 265.000 265.000 270.000 270.000 275.000 275.000 275.000 280.000 281.667 283.333 285.000 285.000 290.000 290.000 290.000 295.000 295.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 310.000 310.000 312.500 315.000 315.000 315.000 315.000 320.000 320.000 320.000 322.500 325.000 325.000 325.000 325.000 325.000 327.500 330.000 332.500 335.000 335.000 335.000 335.000 335.000 338.750 342.500 346.250 350.000 350.000 350.000 350.000 350.000 350.000 355.000 360.000 360.000 360.000 360.000 362.500 365.000 365.000 365.000 365.000 365.000 365.000 370.000 371.667 373.333 375.000 375.000 375.000 380.000 382.500 385.000 385.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 400.000 405.000 410.000 410.000 410.000 410.000 410.000 410.000 410.000 415.000 416.667 418.333 420.000 420.000 425.000 425.000 425.000 425.000 426.667 428.333 430.000 431.667 433.333 435.000 436.667 438.333 440.000 440.000 445.000 446.667 448.333 450.000 450.000 450.000 450.000 450.000 450.000 455.000 455.000 455.000 460.000 460.000 461.250 462.500 463.750 465.000 470.000 470.000 475.000 480.000 485.000 487.500 490.000 490.000 495.000 500.000 500.000 504.000 508.000 512.000 516.000 520.000 522.500 525.000 529.606 534.646 540.183 546.296 553.079 560.648 569.149 578.765 589.730 602.352 617.034 634.327
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 57 0 54 60 0 57 57 57 57 0 0 60 60 57 0 60 57 63 54 0 63 66 63 66 66 63 66 54 63 69 69 69 69 69 69 0 69 66 66 60 54 0 0 0 66 0 60 57 48 0 0 0 57 60 66 69 69 66 69 51 57 63 66 54 60 69 72 72 72 69 72 0 0 69 72 75 72 54 60 66 0 72 63 45 69 60 0 66 60 66 72 75 72 72 57 60 69 72 54 69 69 72 0 0 66 66 57 0 63 66 0 0 0 0 0 0 48 0 60 66 54 0 0 51 0 60 60 0 51 57 0 0 57 54 0 0 0 0 0 0 0 0 51 0 51 54 54 51 57 0 0 0 0 54 0 54 54 51 54 54 54 51 42 51 45 48 0 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</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" >
89.643 90.0 95.0 100.0 105.0 110.0 115.0 115.668 120.0 121.336 125.0 127.004 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 389.924 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.23 1.667 2.15 2.403 2.483 2.386 2.358 2.358 2.358 2.439 2.483 2.57 2.713 2.855 2.997 3.141 3.287 3.436 3.588 3.744 3.903 4.067 4.236 4.409 4.586 4.768 4.954 5.145 5.34 5.54 5.743 5.95 6.161 6.376 6.593 6.814 7.038 7.264 7.492 7.723 7.956 8.191 8.428 8.666 8.905 9.145 9.386 9.628 9.869 10.11 10.35 10.589 10.824 11.056 11.282 11.501 11.71 11.906 12.084 12.241 12.371 12.469 12.53 12.55 12.55 12.544 12.526 12.496 12.457 12.407 12.347 12.279 12.202 12.117 12.025 11.926 11.821 11.71 11.594 11.472 11.346 11.217 11.083 10.947 10.807 10.665 10.521 10.374 10.227 10.077 9.927 9.776 9.625 9.473 9.321 9.169 9.017 8.866 8.715 8.565 8.416 8.268 8.121 7.975 7.83 7.686 7.544 7.404 7.265 7.128 6.992 6.858 6.726 6.595 6.467 6.34 6.215 6.092 5.971 5.851 5.734 5.618 5.505 5.393 5.283 5.175 5.069 4.965 4.862 4.762 4.663 4.566 4.471 4.378 4.286 4.196 4.108 4.022 3.937 3.854 3.772 3.692 3.614 3.537 3.462 3.388 3.316 3.245 3.175 3.107 3.041 2.976 2.912 2.849 2.788 2.728 2.669 2.611 2.555 2.5 2.446 2.393 2.341 2.291 2.241 2.192 2.145 2.098 2.053 2.008 1.965 1.922 1.88 1.839 1.799 1.76 1.722 1.684 1.648 1.612 1.577 1.542 1.509 1.476 1.444 1.412 1.381

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.483" PeakHeight="110.0" Num="3" Error="0.0">
-29.696 11.984 -2.645
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.483" EndFrequency="12.55" PeakHeight="389.924" Num="5" zHalfNm="294.356" Error="3.053">
-225.439 -49.863 14.741 -3.723 1.364
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="17.004" Depth="0.125"/>
<TopsideChapman PeakHeight="389.924" PeakDensity="1954125.2" PeakScaleHeight="70.493" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
