<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-21 -294 21:30:00.000"
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="12.0">
<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" >
2026.10.21 (294) 21:30:00</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">
FF202629410212130009039031101000005012000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.930" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="19.781" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="6.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="420.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="420.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="426.993" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.405" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="333.954" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="286.916" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.859" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="68.350" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="8.477" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="35.310" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="68.260" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.010" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="5">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
6.55 6.6 6.65 6.7 6.75
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
420.000 422.904 426.993 433.180 443.635
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.953125 -1.953125 -1.953125 -1.171875 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="144">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
92.601 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.239 140.0 145.0 150.0 155.0 160.0 165.0 168.478 170.0 175.0 180.0 185.0 190.0 195.0 197.717 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 333.954 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.268 0.351 0.392 0.405 0.4 0.387 0.362 0.326 0.271 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.211 0.246 0.281 0.316 0.351 0.386 0.405 0.448 0.551 0.666 0.797 0.947 1.118 1.311 1.527 1.766 2.028 2.31 2.612 2.929 3.26 3.6 3.947 4.296 4.642 4.981 5.308 5.616 5.899 6.151 6.367 6.538 6.662 6.733 6.75 6.749 6.731 6.69 6.627 6.546 6.448 6.335 6.211 6.077 5.934 5.785 5.63 5.472 5.311 5.148 4.985 4.822 4.66 4.5 4.341 4.186 4.033 3.883 3.737 3.595 3.457 3.322 3.192 3.065 2.943 2.824 2.71 2.6 2.493 2.391 2.292 2.197 2.105 2.017 1.933 1.852 1.774 1.699 1.627 1.558 1.492 1.428 1.367 1.309 1.253 1.199 1.148 1.099 1.052 1.007 0.963 0.922 0.882 0.844 0.808 0.773 0.74 0.708 0.677 0.648 0.62 0.594 0.568 0.543 0.52 0.497 0.476 0.455 0.436 0.417 0.399 0.382 0.365 0.349 0.334 0.32 0.306 0.293 0.28 0.268 0.256 0.245 0.235 0.224 0.215 0.205

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.405" PeakHeight="110.0" Num="3" Error="0.0">
-20.347 3.175 -0.227
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.405" EndFrequency="6.75" PeakHeight="333.954" Num="5" zHalfNm="286.916" Error="0.826">
-135.163 -2.165 1.316 -0.585 0.36
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="87.717" Depth="0.205"/>
<TopsideChapman PeakHeight="333.954" PeakDensity="565291.56" PeakScaleHeight="35.31" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
