<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-18 -291 18:30:00.000"
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="15.0">
<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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x cusp, 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" >
2026.10.18 (291) 18:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.39" 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">
FF202629110181830009039031101000005015000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="7.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.294" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.223" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="6.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.500" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="330.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="330.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="347.388" 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="2.792" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="239.660" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="174.038" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="10.276" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="75.032" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="11.757" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="42.730" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="112.540" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.080" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="19">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
330.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 340.729 341.587 342.612 343.860 345.410 347.388 350.000 353.608 358.915
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 72 69 66 66 69 69 72 69 69 60 0 0 0 66 63 72 63 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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="147">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.582 90.0 95.0 100.0 105.0 110.0 114.17 115.0 118.341 120.0 122.511 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 239.66 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 1.876 2.417 2.701 2.792 2.67 2.67 2.67 2.719 2.792 2.893 3.1 3.317 3.545 3.779 4.012 4.237 4.45 4.651 4.84 5.019 5.189 5.353 5.511 5.665 5.816 5.966 6.115 6.265 6.418 6.575 6.742 6.92 7.05 7.05 7.04 7.012 6.968 6.91 6.838 6.755 6.662 6.559 6.448 6.331 6.207 6.079 5.947 5.812 5.674 5.535 5.395 5.254 5.113 4.973 4.833 4.695 4.558 4.423 4.291 4.16 4.032 3.906 3.783 3.662 3.545 3.43 3.318 3.209 3.103 2.999 2.899 2.801 2.707 2.615 2.526 2.439 2.355 2.274 2.196 2.12 2.046 1.975 1.906 1.839 1.775 1.713 1.652 1.594 1.538 1.484 1.431 1.381 1.332 1.284 1.239 1.195 1.152 1.111 1.072 1.034 0.997 0.961 0.927 0.894 0.862 0.831 0.802 0.773 0.745 0.719 0.693 0.668 0.644 0.621 0.599 0.577 0.557 0.537 0.518 0.499 0.481 0.464 0.447 0.431 0.416 0.401 0.386 0.373 0.359 0.346 0.334 0.322 0.31 0.299 0.289 0.278 0.268 0.259 0.249 0.24 0.232 0.223 0.215 0.208 0.2

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.792" PeakHeight="110.0" Num="3" Error="0.0">
-30.011 12.434 -2.841
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.792" EndFrequency="7.05" PeakHeight="239.66" Num="5" zHalfNm="174.038" Error="2.611">
-93.506 -38.159 21.188 -8.25 1.578
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="12.511" Depth="0.122"/>
<TopsideChapman PeakHeight="239.66" PeakDensity="616656.3" PeakScaleHeight="42.73" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
