<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 22:10:00.000"
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) 22:10:00</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">
FF202609104012210009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.608" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="20.603" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.300" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="507.462" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="425.408" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="370.914" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.252" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="82.256" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="13.890" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="40.598" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="92.670" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.340" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="92">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.85 3.9 3.95 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
385.000 385.000 385.000 385.000 390.000 391.250 392.500 393.750 395.000 395.000 395.714 396.429 397.143 397.857 398.571 399.286 400.000 402.500 405.000 405.000 405.000 407.500 410.000 410.000 410.000 410.000 410.000 410.000 410.000 415.000 415.000 417.500 420.000 420.000 420.000 420.000 421.250 422.500 423.750 425.000 425.000 430.000 431.667 433.333 435.000 435.000 435.000 435.000 435.000 440.000 440.000 440.000 442.000 444.000 446.000 448.000 450.000 450.000 452.500 455.000 455.000 455.000 455.000 460.000 460.000 460.000 465.000 465.000 465.000 470.000 470.000 472.500 475.000 475.000 477.500 480.000 480.000 480.000 482.000 484.000 486.000 488.000 490.000 492.319 495.063 498.361 502.400 507.462 513.992 522.734 535.045 553.669
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 66 0 60 66 0 0 0 63 66 0 0 0 0 0 0 66 60 66 69 66 0 60 0 66 48 51 0 0 60 60 54 60 0 63 66 0 0 0 66 63 60 0 48 54 57 0 48 66 57 60 60 0 57 0 0 54 57 0 54 57 60 60 54 57 54 54 57 60 54 57 45 54 54 0 51 54 60 0 0 57 0 57 60 57 0 51 0 0 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.953125 -1.171875 -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 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 -1.953125 -1.171875 -1.171875 -1.953125 -1.953125 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -2.734375 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 2.734375 -2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="180">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 141.517 145.0 150.0 155.0 160.0 165.0 170.0 173.034 175.0 180.0 185.0 190.0 195.0 200.0 204.551 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 425.408 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.342 0.326 0.302 0.268 0.219 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.21 0.234 0.258 0.283 0.307 0.332 0.354 0.359 0.419 0.489 0.57 0.659 0.757 0.861 0.972 1.088 1.209 1.334 1.464 1.598 1.737 1.879 2.026 2.178 2.333 2.493 2.658 2.828 3.002 3.182 3.367 3.557 3.753 3.955 4.162 4.376 4.596 4.823 5.055 5.295 5.541 5.792 6.049 6.31 6.573 6.835 7.091 7.334 7.552 7.731 7.852 7.9 7.9 7.89 7.859 7.808 7.739 7.653 7.554 7.441 7.318 7.185 7.044 6.896 6.742 6.584 6.423 6.26 6.094 5.928 5.762 5.597 5.432 5.269 5.108 4.949 4.792 4.638 4.488 4.34 4.196 4.055 3.917 3.783 3.653 3.526 3.403 3.284 3.168 3.055 2.946 2.841 2.738 2.64 2.544 2.451 2.362 2.276 2.192 2.112 2.034 1.959 1.887 1.817 1.75 1.685 1.622 1.562 1.504 1.448 1.394 1.342 1.292 1.243 1.197 1.152 1.109 1.067 1.027 0.989 0.951 0.916 0.881 0.848 0.816 0.786 0.756 0.728 0.7 0.674 0.648 0.624 0.6 0.578 0.556 0.535 0.515 0.496 0.477 0.459 0.442 0.425 0.409 0.393 0.379 0.364 0.351 0.337 0.325 0.312 0.301 0.289 0.278 0.268 0.258 0.248 0.239 0.23 0.221 0.213 0.205

</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="7.9" PeakHeight="425.408" Num="5" zHalfNm="370.914" Error="1.045">
-197.684 -42.383 25.859 -7.142 0.493
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="94.551" Depth="0.154"/>
<TopsideChapman PeakHeight="425.408" PeakDensity="774317.6" PeakScaleHeight="40.598" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
