<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-04 -094 12:10:00.000"
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" >
2026.04.04 (094) 12:10:00</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">
FF202609404041210009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="11.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.733" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.976" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" 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="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="425.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.073" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.210" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="330.974" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="249.044" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.856" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="107.948" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="44.587" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="59.276" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="141.440" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.180" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="135">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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" >
255.000 255.000 260.000 260.000 260.000 265.000 267.500 270.000 272.500 275.000 277.500 280.000 280.000 280.000 283.333 286.667 290.000 290.000 290.000 290.833 291.667 292.500 293.333 294.167 295.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 307.500 310.000 315.000 315.000 315.000 320.000 320.000 321.500 323.000 324.500 326.000 327.500 329.000 330.500 332.000 333.500 335.000 335.000 337.500 340.000 340.000 340.000 345.000 345.000 345.000 347.500 350.000 350.000 355.000 355.000 355.000 355.000 355.000 360.000 360.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 380.000 380.000 380.000 385.000 387.500 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 400.000 405.000 405.000 405.000 407.500 410.000 410.000 410.000 412.500 415.000 420.000 420.000 421.667 423.333 425.000 425.000 425.000 425.000 425.000 425.000 430.000 440.000 440.000 442.500 445.000 447.500 450.000 455.000 457.500 460.999 464.863 469.151 473.938 479.316 485.402 492.345 500.340 509.646 520.614
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 45 45 0 45 57 0 45 0 0 0 45 48 48 0 0 0 48 54 0 0 0 0 0 60 54 0 0 0 54 60 60 54 60 63 0 63 0 63 51 57 60 45 51 0 0 0 0 0 0 0 57 0 51 54 0 48 54 63 51 54 60 0 54 60 51 57 63 66 63 60 63 51 57 63 63 60 63 60 57 57 48 51 57 57 54 54 0 42 0 54 63 60 63 63 63 66 51 54 63 0 51 57 60 0 57 45 51 0 0 51 54 54 45 48 42 0 42 45 0 45 0 45 45 0 42 45 48 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 -1.953125 0.390625 -1.171875 -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 0.390625 0.390625 2.734375 -1.171875 0.390625 0.390625 0.390625 -0.390625 0.390625 2.734375 -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 -1.171875 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 -1.953125 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 -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" >
89.533 90.0 95.0 100.0 105.0 110.0 112.895 115.0 115.791 118.686 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 330.974 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.238 2.066 2.66 2.973 3.073 2.951 2.951 2.951 3.073 3.127 3.317 3.495 3.669 3.84 4.012 4.185 4.36 4.539 4.72 4.906 5.095 5.288 5.484 5.685 5.889 6.097 6.308 6.522 6.739 6.958 7.18 7.403 7.629 7.857 8.086 8.317 8.55 8.784 9.02 9.257 9.495 9.734 9.973 10.213 10.452 10.688 10.919 11.141 11.344 11.518 11.642 11.698 11.7 11.695 11.674 11.639 11.59 11.528 11.455 11.37 11.274 11.169 11.056 10.934 10.806 10.671 10.53 10.384 10.233 10.079 9.921 9.761 9.598 9.433 9.267 9.099 8.931 8.763 8.594 8.426 8.258 8.091 7.925 7.76 7.597 7.435 7.274 7.116 6.959 6.805 6.652 6.502 6.354 6.208 6.064 5.923 5.785 5.649 5.515 5.384 5.255 5.129 5.006 4.884 4.766 4.649 4.536 4.424 4.315 4.209 4.105 4.003 3.903 3.806 3.711 3.618 3.527 3.438 3.352 3.267 3.184 3.104 3.025 2.948 2.873 2.8 2.729 2.659 2.591 2.525 2.461 2.398 2.336 2.276 2.218 2.161 2.105 2.051 1.998 1.947 1.897 1.848 1.8 1.754 1.709 1.664 1.621 1.58 1.539 1.499 1.46 1.422 1.386 1.35 1.315 1.281 1.248 1.215 1.184 1.153 1.123 1.094 1.066 1.038 1.011 0.985 0.959 0.934 0.91 0.887 0.864 0.841 0.819 0.798 0.777 0.757 0.737 0.718 0.7 0.681 0.664 0.646 0.63 0.613 0.597 0.582 0.567

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.073" PeakHeight="110.0" Num="3" Error="0.0">
-30.256 12.791 -3.002
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.073" EndFrequency="11.7" PeakHeight="330.974" Num="5" zHalfNm="249.044" Error="2.683">
-173.17 -53.749 16.991 -3.88 1.52
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="8.686" Depth="0.122"/>
<TopsideChapman PeakHeight="330.974" PeakDensity="1698387.1" PeakScaleHeight="59.276" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
