<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 08:30:00.000"
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: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp</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) 08:30:00</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">
FF202609104010830009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="4.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.403" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="15.653" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.100" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.750" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="4.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="235.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="235.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="120.000" Name="h`Es" 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="4.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="297.497" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.557" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.750" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.750" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="298.004" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="223.441" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.756" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.650" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="105.016" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.126" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="58.291" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="85.470" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="6.370" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="38">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
235.000 240.000 240.000 240.000 240.000 240.000 241.875 243.750 245.625 247.500 249.375 251.250 253.125 255.000 257.500 260.000 260.000 260.000 260.000 255.000 265.000 265.000 265.000 267.257 269.820 272.756 276.152 280.127 284.840 290.520 297.497 306.274 317.651 332.981 354.762 388.146 445.778 569.129
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
75 72 0 0 69 75 0 0 0 0 0 66 0 66 0 54 57 60 69 0 66 57 51 57 63 60 0 0 69 48 0 54 69 72 54 60 0 63
</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 1.171875 -0.390625 -0.390625 1.171875 -0.390625 0.390625 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="10">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.0 2.05 2.1
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
130.000 130.000 127.500 125.000 120.000 125.000 125.000 122.500 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 63 63 57 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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="182">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
91.302 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 137.141 140.0 145.0 150.0 155.0 160.0 164.283 165.0 170.0 175.0 180.0 185.0 190.0 191.424 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 298.004 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.369 0.483 0.539 0.557 0.549 0.526 0.485 0.42 0.316 0.248 0.248 0.248 0.248 0.248 0.248 0.248 0.256 0.313 0.37 0.427 0.484 0.541 0.557 0.754 0.89 1.031 1.201 1.445 2.24 3.392 3.687 3.883 4.031 4.148 4.244 4.324 4.39 4.445 4.491 4.527 4.556 4.577 4.591 4.599 4.6 4.599 4.594 4.582 4.564 4.541 4.513 4.48 4.444 4.403 4.358 4.31 4.259 4.206 4.15 4.092 4.032 3.971 3.908 3.844 3.779 3.713 3.646 3.579 3.512 3.445 3.377 3.31 3.243 3.176 3.11 3.044 2.979 2.914 2.85 2.787 2.724 2.663 2.602 2.542 2.483 2.425 2.368 2.312 2.257 2.203 2.15 2.098 2.046 1.996 1.947 1.899 1.852 1.806 1.761 1.717 1.674 1.632 1.591 1.551 1.512 1.473 1.436 1.399 1.363 1.328 1.294 1.261 1.229 1.197 1.166 1.136 1.107 1.078 1.05 1.023 0.996 0.97 0.945 0.92 0.896 0.873 0.85 0.828 0.806 0.785 0.765 0.745 0.725 0.706 0.688 0.67 0.652 0.635 0.618 0.602 0.586 0.571 0.556 0.541 0.527 0.513 0.5 0.486 0.474 0.461 0.449 0.437 0.426 0.414 0.403 0.393 0.382 0.372 0.362 0.353 0.344 0.335 0.326 0.317 0.309 0.301 0.293 0.285 0.277 0.27 0.263 0.256 0.249 0.243 0.236 0.23 0.224 0.218 0.212 0.207 0.201

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.557" PeakHeight="110.0" Num="3" Error="0.0">
-23.142 4.947 -0.503
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.557" EndFrequency="4.6" PeakHeight="298.004" Num="5" zHalfNm="223.441" Error="12.054">
-151.284 69.022 -36.795 12.477 0.0
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="81.424" Depth="0.309"/>
<TopsideChapman PeakHeight="298.004" PeakDensity="262531.03" PeakScaleHeight="58.291" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
