<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-11 -042 21:20:00.000"
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="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" >
2026.02.11 (042) 21:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.14" 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">
FF202604202112120009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.100" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.557" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.821" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.100" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.500" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="280.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="280.000" 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="0.450" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="506.667" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="1.016" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="387.473" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="311.642" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.139" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="109.196" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="30.063" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="54.660" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="115.210" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.670" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="161">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
285.000 280.000 280.000 280.000 282.500 285.000 285.000 285.000 285.000 285.000 282.500 280.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 300.000 301.250 302.500 303.750 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 311.250 312.500 313.750 315.000 320.000 320.000 320.000 320.000 315.000 320.000 325.000 325.000 325.000 325.000 327.500 330.000 330.000 330.000 332.500 335.000 335.000 335.000 335.000 335.000 340.000 342.500 345.000 347.500 350.000 350.000 350.000 350.000 350.000 350.000 355.000 360.000 360.000 360.000 361.875 363.750 365.625 367.500 369.375 371.250 373.125 375.000 375.000 375.000 375.000 380.000 380.000 385.000 385.000 387.500 390.000 390.000 390.000 395.000 397.500 400.000 400.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 415.000 415.000 420.000 425.000 425.000 430.000 430.000 430.000 435.000 435.000 440.000 440.000 440.000 445.000 445.000 450.000 450.000 455.000 455.000 460.000 460.000 460.000 465.000 470.000 470.000 475.000 480.000 480.000 485.000 485.000 490.000 495.000 500.000 500.000 503.333 506.667 510.000 515.000 519.374 524.373 530.140 536.867 544.816 554.353 566.006
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 63 57 0 54 0 0 51 54 0 57 66 0 66 63 66 0 63 63 66 66 69 69 69 66 66 69 0 69 72 66 66 63 57 66 0 0 0 63 63 60 0 66 66 69 69 0 0 0 66 57 0 0 69 0 0 66 48 69 60 0 69 0 69 0 66 0 57 0 0 66 0 60 0 54 63 0 69 63 0 66 54 60 66 0 60 0 0 0 0 0 60 66 69 69 63 69 63 66 0 60 66 69 63 0 57 0 69 72 66 69 63 66 57 66 69 69 66 57 63 54 0 69 63 66 57 63 66 60 66 63 69 63 69 60 69 69 66 63 66 63 54 63 60 63 63 60 54 63 0 0 57 60 60 60 60 60 51 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" >
90.254 95.0 100.0 105.0 110.0 115.0 120.0 125.0 126.614 130.0 135.0 140.0 143.228 145.0 150.0 155.0 159.842 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 387.473 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.676 0.88 0.984 1.016 0.999 0.946 0.851 0.81 0.81 0.81 0.81 0.81 0.832 0.894 0.956 1.016 1.02 1.123 1.217 1.31 1.406 1.506 1.612 1.727 1.851 1.987 2.137 2.304 2.489 2.692 2.915 3.156 3.41 3.675 3.946 4.22 4.493 4.764 5.032 5.297 5.558 5.815 6.07 6.321 6.57 6.817 7.062 7.305 7.546 7.786 8.024 8.261 8.496 8.728 8.955 9.177 9.39 9.59 9.771 9.922 10.033 10.093 10.1 10.098 10.082 10.051 10.005 9.947 9.877 9.795 9.703 9.602 9.492 9.374 9.25 9.12 8.984 8.844 8.699 8.552 8.401 8.248 8.093 7.937 7.78 7.623 7.465 7.307 7.15 6.994 6.838 6.684 6.531 6.38 6.23 6.082 5.937 5.793 5.651 5.512 5.375 5.241 5.109 4.979 4.852 4.728 4.606 4.486 4.37 4.255 4.143 4.034 3.927 3.823 3.721 3.621 3.524 3.429 3.337 3.246 3.158 3.072 2.989 2.907 2.828 2.75 2.675 2.601 2.53 2.46 2.392 2.326 2.262 2.199 2.139 2.079 2.022 1.965 1.911 1.858 1.806 1.756 1.707 1.659 1.613 1.568 1.524 1.481 1.44 1.4 1.36 1.322 1.285 1.249 1.214 1.18 1.147 1.115 1.084 1.053 1.024 0.995 0.967 0.94 0.913 0.888 0.863 0.839 0.815 0.792 0.77 0.748 0.727 0.707 0.687 0.667 0.649 0.63 0.613 0.595 0.579 0.562 0.547 0.531 0.516 0.502

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.016" PeakHeight="110.0" Num="3" Error="0.0">
-26.575 8.072 -1.243
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.016" EndFrequency="10.1" PeakHeight="387.473" Num="5" zHalfNm="311.642" Error="6.301">
-203.661 -32.99 15.895 -12.153 5.278
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="49.842" Depth="0.206"/>
<TopsideChapman PeakHeight="387.473" PeakDensity="1265632.8" PeakScaleHeight="54.66" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
