<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 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" >
2026.04.03 (093) 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">
FF202609304031930009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="11.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.659" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.107" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="245.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="245.000" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="455.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.476" 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="355.612" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="267.597" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.075" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="120.375" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="47.204" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="63.683" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="136.070" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.540" 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" >
3.3 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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
250.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 250.000 247.500 245.000 250.000 250.000 250.000 252.500 255.000 255.000 255.000 255.000 255.000 255.000 255.000 260.000 260.000 260.000 260.000 260.000 265.000 267.500 270.000 270.000 270.000 270.000 270.000 271.000 272.000 273.000 274.000 275.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 292.500 295.000 295.000 300.000 300.000 300.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 312.500 315.000 315.000 315.000 315.000 317.500 320.000 320.000 320.000 322.500 325.000 327.500 330.000 330.000 330.000 332.500 335.000 335.000 335.000 335.000 340.000 340.000 342.500 345.000 345.000 347.500 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 360.000 360.000 362.500 365.000 365.000 367.500 370.000 370.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 382.500 385.000 385.000 390.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 417.500 420.000 420.000 420.000 420.000 425.000 425.000 425.000 427.500 430.000 430.000 440.000 440.000 435.000 440.000 450.000 450.000 455.000 455.000 455.000 465.000 470.000 470.000 475.000 485.000 485.000 490.000 495.000 500.000 506.597 514.059 522.569 532.363 543.757 557.178 573.218
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 54 0 54 57 54 54 57 57 45 51 57 54 54 57 0 51 60 60 63 0 63 60 63 63 63 60 63 63 0 0 0 63 63 60 0 0 0 0 54 51 57 63 0 69 66 63 69 69 66 0 69 69 66 0 69 60 0 66 57 0 66 69 0 63 0 69 72 63 69 54 69 0 69 0 63 66 69 0 63 69 72 69 66 69 57 63 66 54 60 66 0 75 66 69 57 75 69 69 60 66 69 57 66 69 72 75 69 72 72 69 72 69 66 72 75 66 69 75 69 69 69 63 66 72 66 66 63 63 60 63 57 63 48 57 63 66 63 63 63 60 48 57 57 54 57 54 54 54 57 54 51 48 54 51 48 51 45 54 54 54 54 54 48 0 42 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 -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 -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 -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 -2.734375 2.734375 2.734375
</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" >
89.645 90.0 95.0 100.0 105.0 110.0 115.0 115.705 120.0 121.409 125.0 127.114 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 355.612 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.23 1.662 2.144 2.396 2.476 2.38 2.351 2.351 2.351 2.43 2.476 2.546 2.668 2.792 2.919 3.051 3.188 3.332 3.483 3.643 3.813 3.992 4.183 4.385 4.598 4.823 5.057 5.3 5.551 5.807 6.067 6.329 6.592 6.855 7.117 7.377 7.635 7.89 8.143 8.393 8.641 8.886 9.128 9.368 9.606 9.84 10.071 10.297 10.519 10.734 10.94 11.134 11.311 11.464 11.586 11.667 11.7 11.7 11.695 11.676 11.644 11.601 11.546 11.481 11.405 11.32 11.227 11.126 11.018 10.903 10.782 10.655 10.524 10.388 10.248 10.105 9.958 9.81 9.659 9.506 9.352 9.196 9.04 8.884 8.727 8.57 8.414 8.257 8.102 7.947 7.794 7.641 7.49 7.34 7.192 7.045 6.9 6.757 6.615 6.476 6.338 6.203 6.069 5.938 5.808 5.681 5.556 5.433 5.313 5.194 5.078 4.964 4.852 4.742 4.634 4.528 4.425 4.323 4.224 4.126 4.031 3.938 3.846 3.757 3.669 3.583 3.499 3.417 3.337 3.259 3.182 3.107 3.034 2.962 2.892 2.823 2.756 2.691 2.627 2.564 2.503 2.444 2.385 2.328 2.273 2.218 2.165 2.113 2.063 2.013 1.965 1.918 1.872 1.827 1.783 1.74 1.698 1.658 1.618 1.579 1.541 1.504 1.467 1.432 1.397 1.364 1.331 1.299 1.267 1.237 1.207 1.178 1.149 1.122 1.095 1.068 1.042 1.017 0.992 0.968 0.945 0.922 0.9 0.878 0.857 0.836 0.816

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.476" PeakHeight="110.0" Num="3" Error="0.0">
-29.688 11.973 -2.64
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.476" EndFrequency="11.7" PeakHeight="355.612" Num="5" zHalfNm="267.597" Error="4.267">
-194.452 -40.641 11.867 -8.0 2.728
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="17.114" Depth="0.125"/>
<TopsideChapman PeakHeight="355.612" PeakDensity="1698387.1" PeakScaleHeight="63.683" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
