<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-18 -077 23:00:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% 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, Trace overlaps while constructing baseline</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" >
2026.03.18 (077) 23:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607703182300009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.189" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.527" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="345.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="345.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="350.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="344.367" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="316.924" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.066" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="42.541" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="5.219" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="20.025" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="53.030" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.090" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="68">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
355.000 356.000 357.000 358.000 359.000 360.000 365.000 362.500 360.000 357.500 355.000 355.000 355.000 350.000 350.000 350.000 350.000 345.000 350.000 348.333 346.667 345.000 347.500 350.000 351.250 352.500 353.750 355.000 356.250 357.500 358.750 360.000 357.500 355.000 355.000 355.000 355.000 357.500 360.000 362.500 365.000 368.333 371.667 375.000 377.500 380.000 385.000 386.364 387.727 389.091 390.455 391.818 393.182 394.545 395.909 397.273 398.636 400.000 400.000 400.000 395.000 350.000 355.000 360.000 370.000 382.808 400.616 427.061
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0 0 54 54 0 0 0 57 0 51 57 57 60 60 57 63 63 0 57 0 57 51 57 0 57 0 0 51 51 54 54 48 57 54 54 51 0 51 0 0 51 54 60 57 0 0 0 57 0 0 0 0 0 0 57 0 54 54 48 0 51 51 51 54 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.953125 -0.390625 0.390625 -0.390625 -2.734375 -1.171875 -1.953125 -2.734375 -1.953125 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.953125 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.953125 -1.953125 -1.171875 -0.390625 -0.390625 0.390625 -1.171875 -1.171875 -2.734375 -1.171875 -0.390625 0.390625 -0.390625 -0.390625 -1.171875 -2.734375 -0.390625 -0.390625 -0.390625 2.734375 -1.953125 -1.171875 0.390625 -2.734375 -2.734375 -1.171875 -1.171875 -1.953125 -1.953125 -2.734375 -1.953125 -1.171875 0.390625 1.953125 -1.953125 -2.734375 -0.390625 -1.953125 -1.171875 0.390625 -1.953125 -0.390625 -2.734375 -1.953125 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="107">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.972 145.0 150.0 155.0 160.0 165.0 170.0 175.0 177.945 180.0 185.0 190.0 195.0 200.0 205.0 210.0 211.917 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 344.367 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.343 0.33 0.309 0.281 0.242 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.209 0.232 0.255 0.277 0.3 0.323 0.345 0.354 0.406 0.509 0.64 0.793 0.964 1.145 1.333 1.527 1.725 1.928 2.136 2.349 2.568 2.794 3.027 3.269 3.52 3.782 4.056 4.345 4.65 4.976 5.324 5.702 6.111 6.534 6.75 6.749 6.701 6.585 6.415 6.203 5.959 5.693 5.414 5.128 4.841 4.556 4.277 4.007 3.747 3.498 3.261 3.037 2.825 2.626 2.44 2.265 2.101 1.949 1.807 1.674 1.551 1.437 1.331 1.232 1.141 1.056 0.977 0.904 0.837 0.774 0.716 0.663 0.613 0.567 0.525 0.486 0.449 0.416 0.384 0.356 0.329 0.304 0.281 0.26 0.241 0.223 0.206

</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="6.75" PeakHeight="344.367" Num="5" zHalfNm="316.924" Error="3.372">
-109.625 -39.804 24.096 -8.059 0.942
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="101.917" Depth="0.154"/>
<TopsideChapman PeakHeight="344.367" PeakDensity="565291.56" PeakScaleHeight="20.025" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
