<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-19 -078 11:00:00.000"
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="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" >
2026.03.19 (078) 11:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607803191100009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="10.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.128" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.751" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.450" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.000" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.560" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="215.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="215.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="102.053" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="99.949" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="9.767" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="365.000" 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="2.684" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="285.240" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="229.253" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.017" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.600" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="75.838" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="24.352" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="42.646" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="97.850" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.250" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="131">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.15
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
215.000 220.000 220.000 222.500 225.000 230.000 230.000 235.000 237.500 240.000 242.500 245.000 250.000 250.000 255.000 255.000 255.000 255.000 256.667 258.333 260.000 265.000 265.000 266.667 268.333 270.000 270.000 270.000 270.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 285.000 285.000 285.000 285.000 290.000 285.000 285.000 287.500 290.000 290.000 290.000 290.000 292.143 294.286 296.429 298.571 300.714 302.857 305.000 305.000 305.000 306.667 308.333 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 315.000 320.000 317.500 315.000 320.000 325.000 325.000 325.000 325.000 325.000 330.000 327.500 325.000 330.000 330.000 330.000 330.000 330.000 330.000 332.500 335.000 337.500 340.000 340.000 340.000 340.000 345.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 360.000 360.000 365.000 365.000 365.000 375.000 375.000 380.000 390.000 395.000 400.000 415.000 440.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 69 66 0 60 57 57 51 0 0 0 63 57 60 51 57 60 0 0 0 60 66 69 0 0 69 0 66 66 0 57 54 0 57 63 69 72 72 72 69 63 0 60 63 63 60 57 54 0 48 48 66 0 69 69 75 72 57 0 69 63 60 51 0 0 0 0 0 0 57 63 69 51 54 57 63 0 63 66 54 0 63 69 48 69 63 63 72 0 60 0 69 69 72 57 60 69 66 66 69 69 66 69 51 72 57 63 63 51 66 66 51 57 66 66 66 63 69 66 66 69 63 51 63 57 63 60 60 60 60 57
</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 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 -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 -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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="12">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
102.053 102.551 103.087 103.667 104.299 104.991 105.758 106.616 107.592 108.726 110.084 111.789
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0 0 0 0 51 54 0 0 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 2.734375 -1.953125 2.734375 2.734375 -1.953125 -0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="18">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 105.000 105.000 105.000 105.000 105.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 0 0 0 63 69 0 69 69 69 69 69 63 66 69 75
</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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="165">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 95.0 99.949 100.0 104.63 105.0 109.312 110.0 113.993 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 285.24 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.207 2.56 2.56 2.443 2.443 2.443 2.46 2.56 2.594 2.75 2.898 3.041 3.184 3.328 3.474 3.624 3.779 3.939 4.105 4.279 4.461 4.652 4.853 5.065 5.289 5.525 5.774 6.037 6.314 6.605 6.909 7.225 7.552 7.887 8.226 8.565 8.898 9.217 9.511 9.767 9.969 10.101 10.15 10.15 10.138 10.101 10.04 9.958 9.857 9.739 9.606 9.459 9.3 9.131 8.954 8.77 8.58 8.385 8.187 7.986 7.783 7.58 7.377 7.175 6.974 6.774 6.577 6.382 6.19 6.001 5.816 5.634 5.456 5.282 5.112 4.947 4.785 4.627 4.474 4.325 4.18 4.039 3.902 3.769 3.641 3.516 3.395 3.278 3.164 3.054 2.948 2.845 2.746 2.65 2.557 2.467 2.38 2.296 2.215 2.137 2.061 1.988 1.917 1.849 1.783 1.72 1.659 1.6 1.543 1.487 1.434 1.383 1.334 1.286 1.24 1.196 1.153 1.112 1.072 1.033 0.996 0.961 0.926 0.893 0.861 0.83 0.8 0.771 0.744 0.717 0.691 0.666 0.643 0.619 0.597 0.576 0.555 0.535 0.516 0.497 0.479 0.462 0.446 0.43 0.414 0.399 0.385 0.371 0.358 0.345 0.332 0.32 0.309 0.298 0.287 0.277 0.267 0.257 0.248 0.239 0.23 0.222 0.214 0.206

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.56" PeakHeight="99.949" Num="3" Error="3.106">
-14.542 5.91 -1.317
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.56" EndFrequency="10.15" PeakHeight="285.24" Num="5" zHalfNm="229.253" Error="2.07">
-132.599 -42.729 1.961 1.197 0.923
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="14.044" Depth="0.117"/>
<TopsideChapman PeakHeight="285.24" PeakDensity="1278194.8" PeakScaleHeight="42.646" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
