<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-31 -031 17:00:00.000"
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="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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: F2x cusp not found, 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) 17:00:00</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">
FF202603101311700009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.442" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.029" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="7.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="7.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="435.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="435.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="536.581" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.245" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="7.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="7.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.292" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="364.749" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="240.598" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.990" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="155.745" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="48.222" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="85.003" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="204.130" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.240" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="48">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
435.000 435.000 435.000 440.000 445.000 445.000 450.000 450.000 455.000 460.000 460.000 465.000 470.000 475.000 480.000 480.000 485.000 490.000 490.000 492.500 495.000 495.000 495.000 500.000 505.000 505.000 510.000 510.000 515.000 515.000 520.000 525.000 525.000 527.500 530.000 533.132 536.581 540.397 544.643 549.395 554.750 560.829 567.791 575.844 585.264 596.433 609.888 626.410
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 45 51 48 45 54 54 57 57 54 57 57 54 48 57 57 48 57 48 57 60 60 0 54 60 60 63 60 66 0 48 57 45 57 54 60 60 60 60 57 54 57 54 51 48 48 45
</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 -2.734375 -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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.505 90.0 95.0 100.0 105.0 110.0 112.153 114.307 115.0 116.46 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 364.749 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.183 2.808 3.139 3.245 3.123 3.123 3.162 3.245 3.345 3.491 3.643 3.801 3.965 4.135 4.31 4.489 4.67 4.851 5.031 5.209 5.385 5.557 5.726 5.891 6.053 6.21 6.365 6.516 6.664 6.809 6.952 7.093 7.231 7.368 7.503 7.637 7.769 7.9 8.03 8.16 8.289 8.417 8.545 8.673 8.801 8.929 9.057 9.185 9.314 9.443 9.571 9.699 9.825 9.947 10.061 10.158 10.226 10.25 10.25 10.246 10.236 10.219 10.196 10.167 10.133 10.093 10.048 9.998 9.944 9.886 9.823 9.756 9.686 9.613 9.536 9.457 9.374 9.29 9.202 9.113 9.022 8.929 8.835 8.738 8.641 8.543 8.443 8.343 8.242 8.141 8.038 7.936 7.833 7.73 7.627 7.525 7.422 7.319 7.217 7.115 7.013 6.912 6.811 6.711 6.611 6.513 6.415 6.317 6.221 6.125 6.03 5.936 5.843 5.751 5.659 5.569 5.48 5.391 5.304 5.218 5.133 5.048 4.965 4.883 4.802 4.722 4.643 4.565 4.489 4.413 4.338 4.265 4.192 4.121 4.05 3.981 3.913 3.845 3.779 3.714 3.649 3.586 3.524 3.462 3.402 3.343 3.284 3.227 3.17 3.114 3.06 3.006 2.953 2.901 2.849 2.799 2.749 2.701 2.653 2.605 2.559 2.514 2.469 2.425 2.382 2.339 2.297 2.256 2.216 2.176 2.137 2.099 2.061 2.024 1.988 1.952 1.917 1.883 1.849 1.815 1.783 1.751 1.719 1.688 1.658 1.628

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.245" PeakHeight="110.0" Num="3" Error="0.0">
-30.393 12.992 -3.094
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.245" EndFrequency="10.25" PeakHeight="364.749" Num="5" zHalfNm="240.598" Error="2.574">
-213.2 -58.448 34.416 -13.284 2.227
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.46" Depth="0.122"/>
<TopsideChapman PeakHeight="364.749" PeakDensity="1303505.0" PeakScaleHeight="85.003" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
