<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 10:10:00.000"
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 22 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 70% 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" >
2026.04.03 (093) 10:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609304031010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="9.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.342" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.751" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="8.400" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.100" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.360" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.200" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="95.258" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="94.170" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="4.103" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="325.000" 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="2.283" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="250.248" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="195.669" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.163" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.400" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="74.253" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="21.356" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="40.753" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="93.280" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.290" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="5.700" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="83">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 256.250 257.500 258.750 260.000 260.000 260.000 260.000 260.000 260.000 261.667 263.333 265.000 262.500 260.000 261.000 262.000 263.000 264.000 265.000 265.000 265.000 265.000 265.000 265.000 265.000 270.000 270.000 270.000 271.000 272.000 273.000 274.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 280.000 280.000 280.000 280.000 281.000 282.000 283.000 284.000 285.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 295.000 300.000 300.000 300.000 305.000 305.000 305.000 310.000 310.000 315.000 315.000 320.000 325.000 325.000 325.000 335.000 335.000 340.000 344.336 350.327 359.142 373.394 400.355
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 54 0 0 0 60 51 0 0 0 54 0 0 0 0 60 0 51 0 0 66 0 63 60 60 60 0 69 0 63 0 0 0 0 66 0 66 66 66 66 72 72 69 69 75 69 0 0 69 0 75 66 0 66 75 78 69 72 69 72 78 81 78 66 75 78 78 78 81 81 81 78 63 72 63 69 78 75 60 72 63 66 66
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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 -1.171875 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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 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="6">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.1 2.15 2.2 2.25 2.3 2.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
95.258 96.123 97.107 98.250 99.619 101.338
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 69 60 72 69 69
</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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="121">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
96.667 98.333 100.000 95.000 95.000 95.000 97.500 100.000 110.000 110.000 105.000 100.000 95.000 100.000 100.000 105.000 105.000 105.000 100.000 102.500 105.000 107.500 110.000 110.000 110.000 105.000 100.000 100.000 100.000 110.000 110.000 108.000 106.000 104.000 102.000 100.000 103.750 107.500 111.250 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 105.000 110.000 110.000 110.000 110.000 109.286 108.571 107.857 107.143 106.429 105.714 105.000 100.000 102.500 105.000 107.500 110.000 110.000 105.000 107.500 110.000 110.000 110.000 110.000 105.000 115.000 115.000 111.667 108.333 105.000 105.000 102.500 100.000 100.000 97.500 95.000 95.000 105.000 105.000 102.500 100.000 100.000 95.000 95.000 100.000 95.000 95.000 97.500 100.000 102.500 105.000 105.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 101.250 102.500 103.750 105.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 69 72 0 72 0 66 57 60 0 0 54 72 69 66 0 63 75 0 0 0 63 60 69 0 69 75 72 0 60 0 60 0 0 75 0 63 0 57 0 0 0 0 0 54 57 0 63 63 0 60 0 51 0 0 0 0 66 66 0 60 51 60 0 60 0 63 0 0 63 66 51 51 0 0 60 60 51 72 66 0 66 60 66 63 0 66 75 54 51 69 69 0 0 0 60 60 57 66 63 0 0 0 60 57 0 54 0 57 54 0 0 0 45 48 51 51 51 45 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 -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 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -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="152">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 94.17 95.0 100.0 100.862 105.0 107.554 110.0 114.246 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 250.248 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.36 2.358 2.26 2.228 2.228 2.228 2.276 2.36 2.396 2.668 2.972 3.277 3.57 3.852 4.125 4.393 4.657 4.921 5.186 5.454 5.726 6.005 6.291 6.585 6.888 7.201 7.523 7.854 8.189 8.523 8.848 9.15 9.413 9.619 9.751 9.8 9.8 9.787 9.748 9.684 9.598 9.493 9.369 9.23 9.077 8.913 8.739 8.556 8.366 8.171 7.972 7.77 7.566 7.361 7.156 6.951 6.748 6.546 6.346 6.15 5.956 5.766 5.579 5.397 5.218 5.043 4.873 4.707 4.546 4.389 4.236 4.088 3.944 3.805 3.67 3.539 3.412 3.289 3.171 3.056 2.945 2.838 2.734 2.634 2.538 2.445 2.355 2.268 2.184 2.104 2.026 1.951 1.878 1.809 1.741 1.677 1.614 1.554 1.496 1.44 1.386 1.335 1.285 1.237 1.191 1.146 1.103 1.062 1.022 0.984 0.947 0.911 0.877 0.844 0.813 0.782 0.753 0.724 0.697 0.671 0.646 0.622 0.598 0.576 0.554 0.533 0.513 0.494 0.475 0.458 0.44 0.424 0.408 0.393 0.378 0.364 0.35 0.337 0.324 0.312 0.3 0.289 0.278 0.268 0.258 0.248 0.239 0.23 0.221 0.213 0.205

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.36" PeakHeight="94.17" Num="3" Error="0.639">
-6.062 2.417 -0.525
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.36" EndFrequency="9.8" PeakHeight="250.248" Num="5" zHalfNm="195.669" Error="2.28">
-120.192 -24.429 9.176 0.691 -1.248
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="20.076" Depth="0.132"/>
<TopsideChapman PeakHeight="250.248" PeakDensity="1191563.2" PeakScaleHeight="40.753" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
