<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 00:10:00.000"
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 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2</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) 00:10:00</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">
FF202609304030010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.115" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.810" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="270.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="270.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="391.782" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="325.112" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="292.647" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.926" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="48.151" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="10.950" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="23.921" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="49.430" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.800" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="141">
<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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
270.000 275.000 274.375 273.750 273.125 272.500 271.875 271.250 270.625 270.000 271.250 272.500 273.750 275.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 281.000 282.000 283.000 284.000 285.000 280.000 280.000 282.500 285.000 287.500 290.000 290.000 290.000 290.000 290.000 290.000 290.000 292.500 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 297.500 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 305.000 306.250 307.500 308.750 310.000 310.000 310.000 310.000 310.000 311.000 312.000 313.000 314.000 315.000 315.000 315.000 315.000 317.500 320.000 320.000 320.000 320.000 320.556 321.111 321.667 322.222 322.778 323.333 323.889 324.444 325.000 327.500 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 336.667 338.333 340.000 340.000 340.000 340.000 340.000 340.000 345.000 345.000 350.000 350.000 345.000 350.000 355.000 355.000 355.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 370.000 370.000 370.000 370.000 370.000 375.000 376.432 378.070 379.962 382.172 384.788 387.932 391.782 396.608
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
78 0 0 0 0 0 0 0 0 66 0 0 0 72 75 63 0 0 0 0 0 72 75 0 0 0 0 69 72 0 0 0 0 57 57 0 0 0 51 75 0 63 63 66 0 0 0 72 72 0 60 63 66 0 0 69 72 72 63 72 72 72 0 51 0 60 63 0 69 72 0 75 0 0 66 0 66 69 0 57 0 63 66 0 0 0 0 63 0 69 0 72 60 66 66 72 66 60 60 63 66 0 0 60 0 69 72 69 69 69 72 54 60 72 72 57 63 63 69 69 72 69 69 69 69 66 69 57 63 69 69 69 69 66 60 66 66 60 0 54 0
</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 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 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 -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 -1.953125 0.390625 1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="118">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.151 150.0 155.0 160.0 165.0 170.0 175.0 180.0 182.302 185.0 190.0 195.0 200.0 205.0 210.0 215.0 218.453 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 325.112 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.345 0.333 0.315 0.291 0.258 0.213 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.211 0.233 0.254 0.275 0.297 0.318 0.339 0.354 0.42 0.575 0.739 0.943 1.205 1.545 1.966 2.447 2.964 3.498 4.04 4.586 5.136 5.69 6.246 6.803 7.355 7.892 8.394 8.827 9.134 9.25 9.25 9.214 9.109 8.946 8.736 8.487 8.209 7.908 7.593 7.268 6.939 6.609 6.282 5.961 5.647 5.342 5.048 4.765 4.493 4.234 3.987 3.751 3.528 3.316 3.116 2.927 2.748 2.58 2.421 2.272 2.131 1.999 1.874 1.757 1.648 1.545 1.448 1.357 1.272 1.192 1.117 1.047 0.981 0.919 0.861 0.807 0.756 0.708 0.664 0.622 0.582 0.546 0.511 0.479 0.449 0.42 0.394 0.369 0.346 0.324 0.303 0.284 0.266 0.249 0.234 0.219 0.205

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="9.25" PeakHeight="325.112" Num="5" zHalfNm="292.647" Error="2.634">
-103.707 -8.063 7.406 -4.696 2.401
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="108.453" Depth="0.154"/>
<TopsideChapman PeakHeight="325.112" PeakDensity="1061569.5" PeakScaleHeight="23.921" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
