<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-23 -082 01:30:00.000"
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 33 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Moderate F-spread, 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" >
2026.03.23 (082) 01:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202608203230130009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.339" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.549" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="295.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="295.000" 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="0.600" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="341.949" 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="0.354" 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="/" />
<URSI ID="92" Val="306.176" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="280.773" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.752" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="37.444" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="8.473" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="19.026" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="38.180" 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="80">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
315.000 310.000 308.333 306.667 305.000 304.688 304.375 304.063 303.750 303.438 303.125 302.813 302.500 302.188 301.875 301.563 301.250 300.938 300.625 300.313 300.000 300.000 300.000 297.500 295.000 295.000 297.500 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 300.000 310.000 307.500 305.000 305.000 307.500 310.000 310.625 311.250 311.875 312.500 313.125 313.750 314.375 315.000 315.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.455 325.909 326.364 326.818 327.273 327.727 328.182 328.636 329.091 329.545 330.495 331.675 333.180 335.167 337.912 341.949 348.473 360.805 392.914
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 57 0 0 60 0 57 0 60 0 0 66 66 60 66 63 0 69 0 57 66 0 72 66 72 69 0 72 75 0 75 66 0 0 72 69 63 60 75 75 63 69 72 66 72 0 78 78 72 69 69 75 66 78 72 78 69 72 72 72 69 69 72 69 69 63 66 0 69 60 66 63 57 63 63 63 0 69 66 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
1.171875 1.171875 1.171875 1.953125 1.171875 1.953125 1.171875 1.171875 1.953125 1.953125 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.953125 1.171875 1.171875 0.390625 1.171875 1.171875 0.390625 0.390625 1.171875 1.171875 1.171875 1.171875 0.390625 1.171875 0.390625 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 1.953125 1.171875 0.390625 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 0.390625 1.171875 1.171875 1.171875 1.953125 1.171875 0.390625 1.171875 1.171875 1.953125 1.953125 -1.171875 1.171875 1.171875 1.171875 1.171875 1.953125 1.171875 1.953125 1.953125 2.734375 1.953125 1.171875 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="100">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 147.255 150.0 155.0 160.0 165.0 170.0 175.0 180.0 184.51 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 221.765 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 306.176 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0
</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 0.334 0.317 0.295 0.265 0.223 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.202 0.223 0.243 0.264 0.285 0.305 0.326 0.347 0.354 0.455 0.658 0.93 1.278 1.703 2.201 2.766 3.392 4.074 4.802 5.566 6.349 7.125 7.855 8.482 8.934 9.142 9.15 9.115 8.977 8.751 8.458 8.116 7.74 7.342 6.934 6.524 6.118 5.722 5.34 4.973 4.624 4.293 3.981 3.688 3.414 3.157 2.919 2.696 2.49 2.299 2.121 1.957 1.805 1.665 1.535 1.415 1.304 1.202 1.108 1.021 0.941 0.867 0.799 0.736 0.678 0.625 0.575 0.53 0.488 0.45 0.414 0.382 0.352 0.324 0.298 0.275 0.253 0.233 0.215

</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="9.15" PeakHeight="306.176" Num="5" zHalfNm="280.773" Error="1.003">
-81.794 -5.006 3.522 -1.392 0.259
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="111.765" Depth="0.154"/>
<TopsideChapman PeakHeight="306.176" PeakDensity="1038740.7" PeakScaleHeight="19.026" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
