<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-18 -291 03:40:00.000"
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 44 2 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 45% PACIFIC flags: Severe F-spread, F2x cusp not found, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2</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) 03:40:00</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">
FF202629110180340009039031101000005015000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="5.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.848" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="14.812" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="405.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="405.000" 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="5.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="437.215" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="366.624" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="315.918" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.391" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="73.581" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="5.428" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="37.986" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="73.920" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.970" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="13">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
405.000 410.000 411.457 413.173 415.225 417.720 420.820 424.777 430.000 437.215 447.829 464.986 497.426
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 66 66 63 0 0 0 57 0 0 0 0 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 0.390625 -1.171875 -1.953125 -1.953125 -1.171875 -1.171875 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="151">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 147.403 150.0 155.0 160.0 165.0 170.0 175.0 180.0 184.806 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 222.209 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 366.624 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.345 0.334 0.318 0.295 0.265 0.225 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.201 0.221 0.242 0.263 0.283 0.304 0.324 0.345 0.354 0.396 0.475 0.563 0.663 0.775 0.902 1.044 1.202 1.374 1.562 1.762 1.974 2.197 2.427 2.664 2.905 3.148 3.392 3.633 3.87 4.098 4.316 4.518 4.702 4.863 4.996 5.099 5.167 5.198 5.2 5.196 5.176 5.142 5.093 5.033 4.962 4.881 4.792 4.697 4.596 4.49 4.38 4.268 4.153 4.037 3.92 3.804 3.687 3.571 3.457 3.343 3.232 3.122 3.015 2.91 2.807 2.707 2.609 2.514 2.422 2.332 2.245 2.161 2.08 2.001 1.924 1.851 1.78 1.711 1.645 1.581 1.519 1.46 1.403 1.348 1.295 1.244 1.194 1.147 1.102 1.058 1.016 0.976 0.937 0.9 0.864 0.829 0.796 0.764 0.734 0.704 0.676 0.649 0.623 0.598 0.574 0.551 0.529 0.508 0.487 0.468 0.449 0.431 0.414 0.397 0.381 0.366 0.351 0.337 0.323 0.31 0.298 0.286 0.274 0.263 0.253 0.242 0.233 0.223 0.214 0.206

</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="5.2" PeakHeight="366.624" Num="5" zHalfNm="315.918" Error="0.943">
-142.697 -3.334 2.24 -1.149 0.525
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="112.209" Depth="0.154"/>
<TopsideChapman PeakHeight="366.624" PeakDensity="335483.88" PeakScaleHeight="37.986" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
