<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-25 -298 00:10:00.000"
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 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" >
2026.10.25 (298) 00:10:00</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">
FF202629810250010009039031101000005014000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.650" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.027" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.154" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.450" 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="0.500" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="395.532" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="329.292" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="288.103" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.529" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="59.453" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="9.435" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="30.995" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="56.050" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.450" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="81">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
285.000 291.667 298.333 305.000 305.000 301.250 297.500 293.750 290.000 295.000 300.000 300.000 295.000 295.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 296.250 297.500 298.750 300.000 301.250 302.500 303.750 305.000 306.250 307.500 308.750 310.000 311.250 312.500 313.750 315.000 316.250 317.500 318.750 320.000 321.250 322.500 323.750 325.000 326.250 327.500 328.750 330.000 331.250 332.500 333.750 335.000 340.000 335.000 335.000 325.000 325.000 331.667 338.333 345.000 340.000 340.000 346.429 352.857 359.286 365.714 372.143 378.571 385.000 386.429 387.857 388.744 389.840 391.230 393.049 395.532 399.126 404.789 415.029 439.163
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 0 60 54 60 0 0 0 0 63 66 66 0 69 75 66 0 72 69 63 66 0 60 0 0 0 0 0 0 0 0 0 0 0 0 0 66 0 0 63 0 0 0 60 0 60 0 0 0 0 63 0 66 66 63 60 63 66 0 0 63 60 0 66 0 0 0 0 57 57 60 0 0 57 0 60 60 57 60 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -1.171875 -0.390625 0.390625 -1.953125 -1.171875 0.390625 0.390625 0.390625 0.390625 -1.171875 -0.390625 -0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 0.390625 -0.390625 0.390625 0.390625 1.171875 -2.734375 -0.390625 0.390625 0.390625 -1.953125 -0.390625 -1.953125 -0.390625 0.390625 1.171875 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 -0.390625 -1.953125 -0.390625 0.390625 -1.171875 -0.390625 2.734375 0.390625 -0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 1.171875 -0.390625 0.390625 1.171875 0.390625 0.390625 0.390625 1.171875 -0.390625 -1.953125 -0.390625 1.171875 -1.171875 -1.171875 2.734375 1.171875 -1.953125 2.734375 2.734375 -1.171875 -0.390625 1.953125 -0.390625 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="135">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.316 150.0 155.0 160.0 165.0 170.0 175.0 180.0 182.631 185.0 190.0 195.0 200.0 205.0 210.0 215.0 218.947 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 329.292 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0
</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 0.333 0.315 0.291 0.259 0.214 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.21 0.231 0.252 0.274 0.295 0.316 0.337 0.354 0.382 0.512 0.657 0.828 1.037 1.294 1.609 1.989 2.432 2.928 3.462 4.012 4.562 5.094 5.595 6.057 6.47 6.829 7.127 7.361 7.527 7.624 7.65 7.65 7.626 7.567 7.479 7.364 7.227 7.07 6.899 6.714 6.52 6.319 6.113 5.904 5.693 5.483 5.274 5.067 4.864 4.664 4.469 4.279 4.094 3.915 3.742 3.575 3.413 3.258 3.108 2.965 2.827 2.695 2.568 2.447 2.331 2.22 2.114 2.013 1.917 1.824 1.736 1.653 1.573 1.497 1.424 1.355 1.289 1.226 1.166 1.11 1.055 1.004 0.955 0.908 0.864 0.821 0.781 0.743 0.706 0.672 0.639 0.608 0.578 0.549 0.522 0.497 0.472 0.449 0.427 0.406 0.386 0.367 0.349 0.332 0.316 0.3 0.285 0.271 0.258 0.245 0.233 0.222 0.211 0.201

</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="7.65" PeakHeight="329.292" Num="5" zHalfNm="288.103" Error="1.562">
-115.754 8.0 -3.955 0.969 0.395
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="108.947" Depth="0.154"/>
<TopsideChapman PeakHeight="329.292" PeakDensity="726085.6" PeakScaleHeight="30.995" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
