<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-20 -051 10:20:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x cusp</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" >
2026.02.20 (051) 10:20:00</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">
FF202605102201020009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="7.650" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.029" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.170" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.300" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.460" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="230.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="230.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="104.619" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="98.182" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="8.040" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="355.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.301" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="297.683" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="207.905" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.501" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="127.102" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="21.962" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="71.346" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="115.780" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.870" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="90">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
230.000 235.000 235.000 236.250 237.500 238.750 240.000 240.000 242.500 245.000 240.000 240.000 245.000 245.000 245.000 245.000 245.000 246.667 248.333 250.000 255.000 255.000 255.000 255.000 255.000 255.000 265.000 262.500 260.000 260.000 265.000 265.000 265.000 265.000 265.000 265.000 267.500 270.000 270.000 275.000 276.667 278.333 280.000 280.000 280.000 280.000 285.000 290.000 290.000 292.500 295.000 295.000 295.000 295.000 295.000 300.000 300.000 305.000 305.000 305.000 310.000 310.000 315.000 320.000 320.000 320.000 325.000 325.000 330.000 335.000 335.000 340.000 340.000 345.000 350.000 355.000 355.000 360.000 365.000 370.000 375.000 385.000 390.000 405.000 415.000 430.000 451.580 481.485 525.679 597.621
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 54 0 0 0 51 60 0 0 57 60 60 54 60 51 45 0 0 0 48 60 63 66 69 63 0 45 0 51 57 63 63 0 63 54 0 66 63 66 0 0 63 0 66 63 0 63 66 0 51 60 66 66 0 66 66 57 51 57 66 66 63 57 60 66 60 63 0 60 66 63 63 66 63 66 69 66 69 60 69 72 69 66 66 66 69 60 51 48
</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 1.171875 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 1.953125 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 0.390625 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.3 2.35 2.4 2.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
104.619 106.338 108.681 112.516
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 0 0 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 1.953125 -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" >
90.0 95.0 98.182 100.0 104.779 105.0 110.0 111.377 115.0 117.974 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 297.683 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.257 2.46 2.45 2.324 2.324 2.324 2.324 2.399 2.46 2.511 2.636 2.76 2.886 3.013 3.143 3.276 3.415 3.558 3.708 3.865 4.031 4.207 4.394 4.593 4.805 5.03 5.267 5.513 5.763 6.009 6.243 6.46 6.657 6.832 6.985 7.118 7.233 7.331 7.414 7.483 7.539 7.583 7.616 7.638 7.648 7.65 7.649 7.642 7.629 7.608 7.582 7.549 7.511 7.468 7.42 7.368 7.311 7.25 7.186 7.118 7.047 6.973 6.897 6.818 6.737 6.654 6.57 6.484 6.397 6.309 6.22 6.13 6.039 5.948 5.857 5.765 5.674 5.582 5.491 5.4 5.309 5.219 5.129 5.04 4.951 4.863 4.776 4.689 4.604 4.519 4.435 4.353 4.271 4.19 4.11 4.032 3.954 3.877 3.802 3.728 3.654 3.582 3.511 3.441 3.373 3.305 3.239 3.173 3.109 3.046 2.984 2.923 2.863 2.804 2.747 2.69 2.635 2.58 2.526 2.474 2.422 2.372 2.322 2.274 2.226 2.179 2.134 2.089 2.045 2.002 1.959 1.918 1.877 1.837 1.798 1.76 1.723 1.686 1.65 1.615 1.581 1.547 1.514 1.482 1.45 1.419 1.389 1.359 1.33 1.301 1.274 1.246 1.219 1.193 1.168 1.143 1.118 1.094 1.07 1.047 1.025 1.003 0.981 0.96 0.939 0.919 0.899 0.88 0.861 0.842 0.824 0.807 0.789 0.772 0.755 0.739 0.723 0.708 0.692 0.677 0.663 0.648 0.634 0.621 0.607 0.594 0.581

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.46" PeakHeight="98.182" Num="3" Error="1.72">
-11.928 4.803 -1.057
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.46" EndFrequency="7.65" PeakHeight="297.683" Num="5" zHalfNm="207.905" Error="3.42">
-175.985 6.072 -15.075 5.782 -0.503
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="19.792" Depth="0.136"/>
<TopsideChapman PeakHeight="297.683" PeakDensity="726085.6" PeakScaleHeight="71.346" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
