<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-20 -051 18:20:00.000"
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) 18:20:00</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">
FF202605102201820009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="11.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.620" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.740" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="5.350" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.000" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.160" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.700" 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="24" Val="106.097" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="121.667" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="98.405" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="8.208" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="475.000" 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="2.995" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.171" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="352.780" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="260.758" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.546" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.200" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="121.314" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="48.728" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="68.879" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="167.480" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.110" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="117">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
315.000 317.500 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 335.000 335.000 335.000 336.250 337.500 338.750 340.000 340.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 362.500 365.000 367.500 370.000 370.000 370.000 370.000 375.000 375.000 375.000 375.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 405.833 406.667 407.500 408.333 409.167 410.000 415.000 415.000 415.000 420.000 420.000 420.000 420.000 425.000 425.000 425.000 430.000 431.000 432.000 433.000 434.000 435.000 430.000 435.000 440.000 440.000 442.500 445.000 445.000 450.000 450.000 450.000 455.000 455.000 460.000 465.000 465.000 470.000 475.000 475.000 480.000 484.186 488.767 493.801 499.359 505.528 512.414 520.149 528.903 538.888 550.385 563.767 579.536
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 45 48 0 57 54 54 57 57 54 57 54 57 54 54 54 0 0 0 60 57 57 57 57 57 63 63 60 54 57 57 57 57 60 0 57 0 54 57 60 63 60 63 63 63 63 66 63 66 66 63 66 66 63 66 69 60 63 63 63 60 63 66 63 0 60 0 0 0 54 66 66 60 63 0 66 60 60 0 63 51 0 0 0 0 54 60 0 54 57 0 51 54 48 54 54 54 51 54 51 51 54 51 48 51 51 48 48 0 45 45 0 0 0 0 0 0
</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 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 2.734375 2.734375 -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 2.734375 -0.390625 -0.390625 2.734375 -2.734375 0.390625 -0.390625 -2.734375 -1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.0 3.05 3.1 3.15
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
106.097 107.774 110.068 113.842
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 54 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 0.390625 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="44">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 105.000 105.000 105.000 105.000 105.000 105.000 107.273 109.545 111.818 114.091 116.364 118.636 120.909 123.182 125.455 127.727 130.000 130.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 123.333 121.667 120.000 120.000 120.000 125.000 123.333 121.667 120.000 120.000 120.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 57 60 63 63 63 63 0 0 0 0 0 0 0 0 0 0 51 51 60 60 60 60 63 60 60 0 60 0 0 63 0 0 66 57 57 0 0 0 57 0 60 60 60
</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 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.953125 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
</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 98.405 100.0 101.645 104.886 105.0 108.126 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 352.78 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.872 3.16 3.129 3.031 3.031 3.036 3.16 3.237 3.424 3.595 3.756 3.911 4.061 4.207 4.352 4.495 4.637 4.779 4.921 5.064 5.207 5.352 5.498 5.645 5.794 5.946 6.099 6.255 6.414 6.575 6.74 6.908 7.08 7.255 7.434 7.617 7.804 7.996 8.193 8.393 8.599 8.809 9.023 9.241 9.461 9.684 9.907 10.129 10.346 10.556 10.752 10.931 11.085 11.209 11.297 11.343 11.35 11.349 11.338 11.316 11.284 11.243 11.191 11.132 11.064 10.988 10.905 10.816 10.72 10.619 10.512 10.401 10.286 10.166 10.043 9.917 9.788 9.657 9.524 9.388 9.252 9.114 8.975 8.835 8.695 8.554 8.413 8.273 8.132 7.992 7.853 7.714 7.576 7.439 7.304 7.169 7.035 6.903 6.772 6.643 6.515 6.388 6.263 6.14 6.019 5.899 5.781 5.664 5.55 5.437 5.326 5.217 5.109 5.004 4.9 4.798 4.698 4.599 4.502 4.407 4.314 4.223 4.133 4.045 3.958 3.874 3.79 3.709 3.629 3.551 3.474 3.399 3.325 3.253 3.182 3.113 3.045 2.978 2.913 2.849 2.787 2.726 2.666 2.607 2.55 2.494 2.439 2.385 2.333 2.281 2.231 2.181 2.133 2.086 2.04 1.994 1.95 1.907 1.864 1.823 1.783 1.743 1.704 1.666 1.629 1.593 1.557 1.523 1.489 1.456 1.423 1.391 1.36 1.33 1.3 1.271 1.243 1.215 1.188 1.161 1.136 1.11 1.085 1.061 1.037 1.014 0.991

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.16" PeakHeight="98.405" Num="3" Error="1.779">
-12.446 5.292 -1.251
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.16" EndFrequency="11.35" PeakHeight="352.78" Num="5" zHalfNm="260.758" Error="3.243">
-199.707 -61.32 13.936 2.858 -0.421
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.721" Depth="0.129"/>
<TopsideChapman PeakHeight="352.78" PeakDensity="1598294.0" PeakScaleHeight="68.879" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
