<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-31 -304 21:00:00.000"
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 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Moderate F-spread, 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) 21:00:00</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">
FF202630410312100009039031101000005014000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="11.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.593" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.981" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="8.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="8.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="395.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="395.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="511.859" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.807" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="8.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="8.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="391.721" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="322.821" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="10.166" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="100.916" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="38.731" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="50.617" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="105.510" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.700" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="64">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
395.000 397.500 400.000 400.000 400.000 405.000 407.500 410.000 412.500 415.000 416.667 418.333 420.000 425.000 425.000 435.000 437.333 439.667 442.000 444.333 446.667 449.000 451.333 453.667 456.000 458.333 460.667 463.000 465.333 467.667 470.000 475.000 477.500 480.000 480.000 480.000 480.000 480.000 485.000 485.000 485.000 490.000 490.000 490.000 490.000 495.000 495.000 497.500 500.000 500.000 500.844 501.798 502.886 504.139 505.596 507.312 509.364 511.859 514.959 518.915 524.139 531.354 541.968 559.124
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 63 63 0 0 0 0 0 54 0 0 66 60 60 57 0 0 0 0 0 0 0 0 0 0 0 0 0 0 54 57 0 54 54 0 0 69 0 0 72 0 0 72 69 60 63 0 63 66 69 66 0 69 60 63 66 63 0 69 69 60 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -1.171875 -0.390625 -0.390625 0.390625 0.390625 -1.171875 -0.390625 -1.953125 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -1.171875 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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.535 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 132.779 135.0 140.0 145.0 150.0 155.0 155.559 160.0 165.0 170.0 175.0 178.338 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 391.721 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.536 0.699 0.781 0.807 0.794 0.755 0.685 0.572 0.48 0.48 0.48 0.48 0.48 0.48 0.48 0.544 0.616 0.687 0.759 0.807 0.862 1.0 1.127 1.257 1.393 1.54 1.7 1.875 2.068 2.28 2.512 2.764 3.035 3.322 3.622 3.933 4.252 4.577 4.906 5.238 5.571 5.906 6.241 6.577 6.914 7.25 7.587 7.924 8.26 8.596 8.931 9.264 9.594 9.92 10.239 10.549 10.845 11.123 11.376 11.594 11.769 11.889 11.946 11.95 11.945 11.92 11.874 11.809 11.727 11.629 11.516 11.39 11.252 11.103 10.944 10.777 10.603 10.423 10.237 10.047 9.853 9.656 9.457 9.257 9.056 8.854 8.653 8.452 8.252 8.054 7.857 7.663 7.47 7.28 7.093 6.908 6.727 6.548 6.373 6.201 6.033 5.868 5.706 5.548 5.393 5.242 5.094 4.95 4.809 4.672 4.538 4.407 4.28 4.156 4.035 3.918 3.804 3.692 3.584 3.478 3.376 3.276 3.179 3.085 2.994 2.905 2.818 2.734 2.653 2.574 2.497 2.422 2.349 2.279 2.211 2.144 2.08 2.017 1.957 1.898 1.84 1.785 1.731 1.679 1.628 1.579 1.531 1.485 1.44 1.397 1.354 1.313 1.274 1.235 1.198 1.161 1.126 1.092 1.059 1.027 0.996 0.966 0.936 0.908 0.88 0.854 0.828 0.803 0.778 0.755 0.732 0.71 0.688 0.667 0.647 0.627 0.608 0.59 0.572 0.554 0.538 0.521 0.505 0.49 0.475 0.461

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.807" PeakHeight="110.0" Num="3" Error="0.0">
-25.454 6.921 -0.932
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.807" EndFrequency="11.95" PeakHeight="391.721" Num="5" zHalfNm="322.821" Error="4.299">
-201.749 -22.054 14.72 -7.976 3.676
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="68.338" Depth="0.327"/>
<TopsideChapman PeakHeight="391.721" PeakDensity="1771743.1" PeakScaleHeight="50.617" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
