<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-31 -304 02:20:00.000"
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="14.0">
<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 2 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: Severe F-spread, F2x cusp not found, 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" >
2026.10.31 (304) 02:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.40" 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">
FF202630410310220009039031101000005014000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.163" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.349" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="285.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="285.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="356.818" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.100" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.100" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="319.245" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="280.756" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.188" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="55.024" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.943" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="29.605" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="49.910" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.060" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="53">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
330.000 330.000 315.000 315.000 311.000 307.000 303.000 299.000 295.000 294.286 293.571 292.857 292.143 291.429 290.714 290.000 290.000 290.000 287.500 285.000 286.667 288.333 290.000 290.000 293.000 296.000 299.000 302.000 305.000 310.000 305.000 308.846 312.692 316.538 320.385 324.231 328.077 331.923 335.769 339.615 343.462 347.308 351.154 355.000 355.000 355.909 356.818 364.849 374.793 387.426 404.011 426.744 459.824
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 63 0 63 0 0 0 0 60 63 0 63 66 0 0 69 66 0 63 66 63 66 60 66 60 0 0 63 60 60 63 0 0 0 0 0 0 66 0 0 0 0 60 63 60 66 0 0 57 57 54 57 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 1.953125 1.171875 1.953125 1.953125 0.390625 1.953125 1.953125 1.953125 1.953125 0.390625 0.390625 1.953125 1.953125 0.390625 1.953125 1.953125 1.953125 2.734375 2.734375 1.171875 1.953125 -0.390625 1.171875 -1.171875 -0.390625 -0.390625 -1.171875 2.734375 1.171875 2.734375 -0.390625 1.171875 1.171875 1.171875 0.390625 0.390625 1.171875 1.953125 1.953125 1.171875 1.171875 1.953125 1.953125 1.953125 1.953125 1.953125 -2.734375 1.953125 1.953125 2.734375 2.734375 1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="126">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 147.436 150.0 155.0 160.0 165.0 170.0 175.0 180.0 184.873 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 222.309 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 319.245 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0
</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 0.266 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 0.262 0.283 0.303 0.324 0.345 0.354 0.399 0.534 0.739 0.982 1.25 1.55 1.897 2.307 2.801 3.388 4.04 4.682 5.242 5.698 6.054 6.325 6.522 6.656 6.73 6.75 6.75 6.726 6.67 6.584 6.474 6.343 6.195 6.032 5.858 5.676 5.488 5.296 5.102 4.907 4.713 4.522 4.333 4.148 3.967 3.791 3.62 3.454 3.294 3.14 2.992 2.849 2.712 2.581 2.455 2.335 2.22 2.11 2.005 1.906 1.81 1.72 1.633 1.551 1.473 1.398 1.327 1.26 1.196 1.135 1.077 1.023 0.97 0.921 0.874 0.829 0.787 0.746 0.708 0.672 0.638 0.605 0.574 0.544 0.517 0.49 0.465 0.441 0.418 0.397 0.377 0.357 0.339 0.321 0.305 0.289 0.274 0.26 0.247 0.234 0.222 0.211

</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="6.75" PeakHeight="319.245" Num="5" zHalfNm="280.756" Error="3.62">
-104.749 13.94 -8.966 5.084 -2.245
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="112.309" Depth="0.154"/>
<TopsideChapman PeakHeight="319.245" PeakDensity="565291.56" PeakScaleHeight="29.605" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
