<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-24 -297 08:20:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 45% PACIFIC flags: Moderate 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" >
2026.10.24 (297) 08:20:00</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">
FF202629710240820009039031101000005014000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="5.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.932" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="15.686" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="1.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" 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="4.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="350.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.766" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="1.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="1.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="320.979" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="254.508" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="4.486" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="93.514" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="7.295" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="48.757" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="87.160" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.500" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="80">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.758 256.515 257.273 258.030 258.788 259.545 260.303 261.061 261.818 262.576 263.333 264.091 264.848 265.606 266.364 267.121 267.879 268.636 269.394 270.152 270.909 271.667 272.424 273.182 273.939 274.697 275.455 276.212 276.970 277.727 278.485 279.242 280.000 285.000 285.000 285.000 290.000 290.000 290.000 292.500 295.000 300.000 300.000 300.000 305.000 305.000 310.000 310.000 315.000 320.000 320.000 325.000 330.000 335.000 335.000 340.000 345.000 350.000 360.000 368.333 376.667 385.000 395.000 401.660 408.950 416.966 425.820 435.653 446.634 458.979 472.958
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 69 72 69 84 78 72 81 84 66 63 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 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 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 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 -0.390625 0.390625 0.390625 -1.953125 -1.171875 2.734375 2.734375 2.734375 -0.390625 1.953125 2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="169">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.616 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 133.697 135.0 140.0 145.0 150.0 155.0 157.394 160.0 165.0 170.0 175.0 180.0 181.091 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 320.979 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.509 0.664 0.742 0.766 0.754 0.718 0.653 0.55 0.431 0.431 0.431 0.431 0.431 0.431 0.431 0.468 0.539 0.609 0.68 0.751 0.766 0.883 0.99 1.093 1.203 1.327 1.472 1.651 1.877 2.157 2.475 2.792 3.083 3.346 3.585 3.804 4.005 4.193 4.367 4.53 4.681 4.82 4.946 5.058 5.155 5.235 5.295 5.333 5.35 5.35 5.347 5.333 5.309 5.277 5.236 5.188 5.133 5.072 5.006 4.934 4.858 4.779 4.696 4.61 4.523 4.433 4.342 4.25 4.156 4.063 3.969 3.876 3.782 3.69 3.597 3.506 3.416 3.326 3.238 3.152 3.066 2.982 2.9 2.819 2.74 2.663 2.587 2.512 2.44 2.369 2.3 2.232 2.167 2.103 2.04 1.979 1.92 1.862 1.806 1.752 1.698 1.647 1.597 1.548 1.501 1.455 1.41 1.367 1.325 1.284 1.244 1.206 1.168 1.132 1.097 1.063 1.03 0.998 0.967 0.937 0.907 0.879 0.852 0.825 0.799 0.774 0.75 0.726 0.704 0.682 0.66 0.639 0.619 0.6 0.581 0.563 0.545 0.528 0.511 0.495 0.48 0.465 0.45 0.436 0.422 0.409 0.396 0.384 0.372 0.36 0.348 0.338 0.327 0.317 0.307 0.297 0.288 0.279 0.27 0.261 0.253 0.245 0.237 0.23 0.223 0.216 0.209 0.202

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.766" PeakHeight="110.0" Num="3" Error="0.0">
-25.174 6.66 -0.87
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.766" EndFrequency="5.35" PeakHeight="320.979" Num="5" zHalfNm="254.508" Error="7.208">
-145.448 8.627 -2.823 -3.95 3.706
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="71.091" Depth="0.335"/>
<TopsideChapman PeakHeight="320.979" PeakDensity="355117.88" PeakScaleHeight="48.757" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
