<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-05 -095 20:10:00.000"
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 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" >
2026.04.05 (095) 20:10:00</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">
FF202609504052010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="11.650" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.720" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.686" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.900" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.150" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.210" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="250.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="250.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="98.080" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="100.000" Name="h`Es" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="475.765" 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="2.041" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="350.561" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="280.508" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.709" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.250" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="95.820" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="37.205" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="49.534" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="111.060" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.390" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="2.550" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="183">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 11.4 11.45 11.5 11.55 11.6 11.65
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 255.000 255.000 253.333 251.667 250.000 250.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 257.500 260.000 260.000 260.000 261.250 262.500 263.750 265.000 265.000 265.000 267.500 270.000 270.000 270.000 270.000 275.000 275.000 275.000 275.000 275.000 280.000 280.000 281.667 283.333 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 295.000 296.250 297.500 298.750 300.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 306.667 308.333 310.000 311.667 313.333 315.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 325.000 326.667 328.333 330.000 325.000 326.667 328.333 330.000 330.000 335.000 335.000 335.000 335.000 335.000 337.500 340.000 342.500 345.000 345.000 345.000 347.500 350.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 360.000 360.000 362.500 365.000 365.000 365.000 370.000 370.000 370.000 370.000 370.000 375.000 375.000 380.000 382.500 385.000 380.000 380.000 385.000 385.000 385.000 387.500 390.000 390.000 390.000 395.000 395.000 395.000 395.000 396.667 398.333 400.000 401.250 402.500 403.750 405.000 410.000 415.000 415.000 415.000 417.500 420.000 415.000 415.000 420.000 425.000 430.000 430.000 430.000 430.000 435.000 435.000 430.000 435.000 440.000 440.000 445.000 445.000 450.000 455.000 460.000 460.000 461.667 462.937 464.374 466.012 467.899 470.093 472.677 475.765 479.522 484.190 490.146 498.009 508.869
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 54 51 0 0 60 66 51 0 60 57 63 66 0 0 69 66 0 69 66 63 0 0 0 63 63 63 0 54 57 0 66 0 0 0 0 0 0 60 0 0 54 0 0 63 0 63 63 63 0 54 69 66 0 0 0 0 63 66 0 0 69 66 0 0 0 0 0 0 0 63 72 69 69 0 0 0 69 51 0 0 45 66 0 0 69 75 63 66 69 69 72 0 66 0 54 63 75 54 63 0 66 60 60 66 57 60 0 75 63 66 66 69 60 60 66 72 69 63 54 48 0 48 63 66 72 72 66 0 75 54 69 69 69 72 78 0 0 72 0 57 0 63 66 57 60 69 0 51 51 0 0 57 48 51 60 60 51 54 60 0 60 54 57 0 60 54 42 54 0 0 48 45 48 54 57 54 42 0 54 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -2.734375 -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 -1.171875 -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 -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 -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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.15 2.2
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
98.080 101.944
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 63
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="14">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.000 102.500 105.000 107.500 110.000 110.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 0 63 0 48 57 69 60 63 57 0 0 48 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 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" >
89.705 90.0 95.0 100.0 105.0 110.0 115.0 117.985 120.0 125.0 125.969 130.0 133.954 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 350.561 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.225 1.482 1.914 2.139 2.21 2.155 2.068 2.068 2.068 2.068 2.14 2.21 2.227 2.308 2.394 2.485 2.581 2.683 2.793 2.91 3.037 3.175 3.325 3.489 3.667 3.863 4.075 4.306 4.553 4.816 5.091 5.374 5.663 5.954 6.245 6.535 6.821 7.105 7.386 7.663 7.938 8.21 8.481 8.75 9.018 9.286 9.554 9.823 10.092 10.361 10.629 10.895 11.151 11.385 11.567 11.649 11.65 11.641 11.61 11.559 11.489 11.402 11.299 11.181 11.051 10.909 10.756 10.594 10.424 10.247 10.065 9.877 9.686 9.491 9.293 9.094 8.894 8.693 8.493 8.292 8.093 7.895 7.699 7.504 7.312 7.122 6.936 6.751 6.57 6.392 6.218 6.046 5.878 5.714 5.553 5.396 5.242 5.092 4.945 4.802 4.662 4.526 4.394 4.264 4.139 4.016 3.897 3.781 3.668 3.558 3.451 3.348 3.247 3.149 3.054 2.961 2.871 2.784 2.699 2.617 2.537 2.46 2.385 2.312 2.241 2.172 2.106 2.041 1.978 1.918 1.859 1.801 1.746 1.692 1.64 1.59 1.54 1.493 1.447 1.402 1.359 1.317 1.276 1.237 1.198 1.161 1.125 1.091 1.057 1.024 0.992 0.962 0.932 0.903 0.875 0.848 0.822 0.796 0.771 0.748 0.724 0.702 0.68 0.659 0.639 0.619 0.6 0.581 0.563 0.546 0.529 0.512 0.496 0.481 0.466 0.452 0.437 0.424 0.411 0.398 0.386 0.374 0.362 0.351 0.34 0.329 0.319

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.21" PeakHeight="110.0" Num="3" Error="0.0">
-29.367 11.524 -2.452
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.21" EndFrequency="11.65" PeakHeight="350.561" Num="5" zHalfNm="280.508" Error="3.546">
-166.695 -54.722 14.208 -12.307 2.909
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="23.954" Depth="0.142"/>
<TopsideChapman PeakHeight="350.561" PeakDensity="1683902.0" PeakScaleHeight="49.534" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
