<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-31 -031 21:40:00.000"
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="18.0">
<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" >
2026.01.31 (031) 21:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" 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">
FF202603101312140009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.320" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="20.301" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="1.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="315.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="315.000" 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="8.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="560.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.651" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="1.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="1.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="452.460" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="355.643" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.220" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="140.288" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="28.794" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="71.080" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="140.300" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.960" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="137">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
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</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 57 0 0 0 0 0 60 0 69 66 0 57 0 66 66 60 0 0 66 0 57 0 0 0 75 63 0 72 75 81 66 0 75 75 75 0 0 0 0 60 63 51 51 0 69 0 69 0 0 0 0 0 57 0 0 0 0 51 57 0 0 0 0 0 0 0 0 72 0 0 0 0 0 0 72 0 72 0 48 0 0 0 66 66 0 66 0 0 66 0 0 0 0 0 60 0 66 0 0 63 51 0 57 51 60 60 66 0 60 0 66 66 66 66 66 63 66 63 63 69 69 63 63 69 69 63 57 63 63 63 48 0 63 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</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" >
90.914 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 135.767 140.0 145.0 150.0 155.0 160.0 161.533 165.0 170.0 175.0 180.0 185.0 187.3 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 452.46 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.432 0.564 0.63 0.651 0.642 0.613 0.562 0.481 0.348 0.319 0.319 0.319 0.319 0.319 0.319 0.319 0.364 0.428 0.493 0.557 0.621 0.651 0.699 0.777 0.851 0.925 1.002 1.083 1.17 1.264 1.367 1.48 1.604 1.742 1.894 2.06 2.24 2.432 2.635 2.845 3.06 3.277 3.495 3.713 3.929 4.143 4.355 4.565 4.773 4.978 5.181 5.381 5.58 5.776 5.971 6.163 6.353 6.54 6.725 6.907 7.086 7.262 7.433 7.599 7.76 7.914 8.061 8.198 8.324 8.437 8.536 8.618 8.682 8.725 8.747 8.75 8.749 8.741 8.724 8.701 8.67 8.632 8.588 8.538 8.483 8.422 8.357 8.286 8.212 8.134 8.052 7.967 7.879 7.788 7.695 7.6 7.503 7.404 7.304 7.202 7.1 6.997 6.893 6.788 6.683 6.578 6.473 6.368 6.263 6.159 6.055 5.951 5.848 5.746 5.644 5.543 5.443 5.344 5.246 5.149 5.053 4.958 4.865 4.772 4.681 4.591 4.502 4.414 4.328 4.243 4.159 4.077 3.996 3.916 3.837 3.76 3.684 3.609 3.536 3.464 3.393 3.323 3.255 3.188 3.122 3.057 2.994 2.932 2.871 2.811 2.752 2.694 2.638 2.582 2.528 2.475 2.422 2.371 2.321 2.272 2.224 2.177 2.13 2.085 2.041 1.997 1.954 1.913 1.872 1.832 1.793 1.754 1.717 1.68 1.644 1.609 1.574 1.54 1.507 1.475 1.443 1.412 1.381 1.352 1.323 1.294

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.651" PeakHeight="110.0" Num="3" Error="0.0">
-24.208 5.794 -0.672
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.651" EndFrequency="8.75" PeakHeight="452.46" Num="5" zHalfNm="355.643" Error="6.627">
-261.318 -9.378 10.585 -10.202 5.153
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="77.3" Depth="0.332"/>
<TopsideChapman PeakHeight="452.46" PeakDensity="949906.94" PeakScaleHeight="71.08" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
