<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-04 -094 17:10:00.000"
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="2 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" >
2026.04.04 (094) 17:10:00</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">
FF202609404041710009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="12.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.480" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.131" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="6.350" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="335.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="335.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="515.000" 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="3.211" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.276" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="385.301" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="272.030" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.271" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.250" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="151.587" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="66.572" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="83.488" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="190.270" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.320" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="116">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
335.000 335.000 336.667 338.333 340.000 341.667 343.333 345.000 345.000 347.500 350.000 351.250 352.500 353.750 355.000 355.000 357.500 360.000 360.000 360.000 362.500 365.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 392.500 395.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 422.500 425.000 425.000 427.500 430.000 430.000 430.000 430.000 435.000 435.000 435.000 437.500 440.000 440.000 442.500 445.000 445.000 445.000 450.000 452.500 455.000 457.500 460.000 460.000 460.000 460.000 462.500 465.000 467.500 470.000 470.000 475.000 475.000 475.000 475.000 480.000 485.000 485.000 490.000 490.000 490.000 500.000 502.500 505.000 510.000 515.000 515.000 520.000 515.000 520.000 540.000 540.000 545.701 551.914 558.712 566.181 574.427 583.576 593.786 605.253 618.224 633.016 650.041 669.846
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 0 0 0 0 0 60 60 0 60 0 0 0 60 57 0 60 63 60 0 63 63 60 66 66 63 66 66 60 0 63 63 66 63 60 63 54 60 63 54 60 63 57 63 66 60 63 57 60 51 57 0 51 60 42 54 57 63 60 60 60 63 54 60 60 54 60 48 57 57 45 51 0 42 51 51 57 0 54 0 48 54 48 51 54 51 0 48 48 48 45 0 48 0 48 48 48 45 48 0 42 42 48 48 51 48 0 48 42 48 48 0 48 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 -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 -1.171875 -0.390625 -0.390625 -2.734375 -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 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 2.734375 -0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="43">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 120.000 120.000 120.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 115.000 115.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 54 54 51 51 0 54 54 0 57 57 54 0 0 60 60 60 0 0 0 0 0 0 0 66 66 66 51 51 51 54 51 54 0 0 0 0 57 69 69 54 54
</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 -1.171875 -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" >
89.511 90.0 95.0 100.0 105.0 110.0 112.298 114.596 115.0 116.894 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 385.301 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.159 2.779 3.106 3.211 3.089 3.089 3.11 3.211 3.33 3.515 3.695 3.871 4.043 4.213 4.381 4.548 4.714 4.879 5.044 5.209 5.374 5.539 5.705 5.872 6.039 6.207 6.376 6.547 6.718 6.891 7.065 7.241 7.418 7.597 7.777 7.959 8.143 8.328 8.515 8.703 8.893 9.085 9.277 9.471 9.665 9.86 10.055 10.25 10.443 10.635 10.824 11.008 11.187 11.359 11.521 11.671 11.806 11.922 12.018 12.089 12.134 12.15 12.15 12.146 12.134 12.115 12.087 12.053 12.011 11.963 11.909 11.849 11.783 11.712 11.636 11.555 11.47 11.38 11.287 11.191 11.091 10.988 10.882 10.774 10.663 10.55 10.435 10.319 10.201 10.082 9.961 9.84 9.718 9.595 9.472 9.348 9.224 9.099 8.975 8.851 8.727 8.603 8.48 8.357 8.235 8.113 7.992 7.872 7.752 7.634 7.516 7.399 7.283 7.168 7.055 6.942 6.831 6.72 6.611 6.504 6.397 6.291 6.187 6.084 5.983 5.883 5.784 5.686 5.589 5.494 5.401 5.308 5.217 5.127 5.039 4.951 4.865 4.781 4.697 4.615 4.534 4.454 4.376 4.299 4.223 4.148 4.075 4.002 3.931 3.861 3.792 3.724 3.658 3.592 3.528 3.464 3.402 3.341 3.281 3.221 3.163 3.106 3.05 2.995 2.94 2.887 2.834 2.783 2.732 2.683 2.634 2.586 2.539 2.492 2.447 2.402 2.358 2.315 2.273 2.231 2.19 2.15 2.111 2.072 2.034 1.997

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.211" PeakHeight="110.0" Num="3" Error="0.0">
-30.366 12.953 -3.076
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.211" EndFrequency="12.15" PeakHeight="385.301" Num="5" zHalfNm="272.03" Error="2.512">
-235.346 -49.98 17.915 -0.907 -0.089
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.894" Depth="0.122"/>
<TopsideChapman PeakHeight="385.301" PeakDensity="1831544.6" PeakScaleHeight="83.488" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
