<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 17:30:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, 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" >
2026.04.01 (091) 17:30:00</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">
FF202609104011730009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="12.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.554" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.771" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="200.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="200.000" Name="h`F2" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="505.000" 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="3.153" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.249" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="372.169" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="282.365" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.569" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="118.591" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="53.493" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="66.530" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="164.740" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.070" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="159">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
200.000 205.000 207.500 210.000 215.000 220.000 225.000 230.000 235.000 240.000 242.500 245.000 245.000 245.000 250.000 255.000 260.000 265.000 270.000 275.000 275.000 285.000 285.000 290.000 290.000 295.000 295.000 295.000 295.000 300.000 305.000 305.000 305.000 310.000 310.000 315.000 320.000 320.000 320.000 320.000 320.000 330.000 330.000 332.500 335.000 337.500 340.000 345.000 345.000 345.000 345.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 385.000 387.500 390.000 385.000 385.000 395.000 395.000 400.000 400.000 400.000 402.500 405.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 421.667 423.333 425.000 426.667 428.333 430.000 430.000 430.000 430.000 430.000 430.000 435.000 435.000 435.000 435.000 437.500 440.000 440.000 440.000 440.000 445.000 445.000 445.000 445.000 445.000 445.000 447.500 450.000 450.000 450.000 452.500 455.000 457.500 460.000 460.000 460.000 460.000 462.500 465.000 467.500 470.000 470.000 475.000 470.000 473.750 477.500 481.250 485.000 488.750 492.500 496.250 500.000 500.000 505.000 505.000 512.500 520.000 520.000 525.000 530.000 536.455 543.862 552.447 562.515 574.487 588.960
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 0 54 51 48 0 0 51 51 0 45 48 48 0 48 51 0 51 51 48 48 57 54 51 48 54 54 51 0 0 0 0 60 63 57 45 57 0 60 0 51 57 0 60 0 57 54 60 0 63 0 63 66 63 66 63 63 63 0 54 57 63 66 60 0 63 63 66 0 57 66 51 57 66 57 0 66 0 57 66 66 69 66 69 57 0 63 66 69 66 69 69 0 0 42 0 0 63 63 0 66 63 60 60 63 57 60 0 60 0 60 60 57 60 57 60 54 57 0 60 0 60 0 0 0 57 60 60 54 0 0 0 54 54 48 48 0 45 0 48 0 0 0 42 48 48 45 0 42 48 0 48 48 48 42 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 2.734375 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 2.734375 -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 -1.171875 -0.390625 -0.390625 -0.390625 1.953125 2.734375 0.390625 1.171875 1.171875 2.734375 -0.390625 0.390625 1.953125 2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -1.953125 -0.390625 -1.171875 -1.953125 -1.953125 -1.953125
</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" >
89.521 90.0 95.0 100.0 105.0 110.0 112.546 115.0 115.093 117.639 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 372.169 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.238 2.12 2.729 3.05 3.153 3.031 3.031 3.031 3.153 3.209 3.334 3.468 3.609 3.756 3.908 4.063 4.219 4.377 4.536 4.695 4.853 5.012 5.171 5.33 5.489 5.649 5.809 5.97 6.132 6.295 6.459 6.626 6.794 6.964 7.136 7.311 7.488 7.669 7.853 8.04 8.232 8.427 8.626 8.83 9.039 9.253 9.472 9.696 9.924 10.157 10.394 10.632 10.87 11.105 11.331 11.541 11.728 11.881 11.99 12.044 12.05 12.048 12.034 12.008 11.97 11.922 11.862 11.794 11.716 11.629 11.535 11.433 11.325 11.21 11.09 10.965 10.835 10.701 10.564 10.423 10.279 10.133 9.984 9.834 9.682 9.53 9.376 9.222 9.067 8.913 8.758 8.604 8.45 8.297 8.145 7.994 7.844 7.695 7.547 7.401 7.256 7.113 6.972 6.832 6.694 6.558 6.424 6.292 6.162 6.034 5.908 5.783 5.661 5.541 5.423 5.307 5.193 5.081 4.971 4.863 4.757 4.653 4.551 4.451 4.353 4.257 4.163 4.071 3.98 3.891 3.805 3.72 3.636 3.555 3.475 3.397 3.32 3.245 3.172 3.1 3.03 2.961 2.894 2.828 2.764 2.701 2.639 2.579 2.52 2.463 2.406 2.351 2.297 2.245 2.193 2.143 2.094 2.046 1.999 1.953 1.908 1.864 1.821 1.779 1.738 1.698 1.659 1.621 1.583 1.547 1.511 1.476 1.442 1.409 1.376 1.345 1.314 1.283 1.254 1.225 1.196 1.169 1.142 1.115 1.089 1.064 1.039

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.153" PeakHeight="110.0" Num="3" Error="0.0">
-30.32 12.886 -3.045
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.153" EndFrequency="12.05" PeakHeight="372.169" Num="5" zHalfNm="282.365" Error="4.64">
-201.342 -69.102 17.721 0.0070 -1.814
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.639" Depth="0.122"/>
<TopsideChapman PeakHeight="372.169" PeakDensity="1801519.9" PeakScaleHeight="66.53" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
