<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-28 -087 22:50:00.000"
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" >
2026.03.28 (087) 22:50:00</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">
FF202608703282250009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.106" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="19.880" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="6.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="315.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="315.000" 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="0.450" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="385.176" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="336.191" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="309.752" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.182" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="39.919" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="4.593" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="20.199" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="48.050" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.100" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="85">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.2 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
340.000 337.500 335.000 330.000 327.500 325.000 323.750 322.500 321.250 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 317.500 315.000 316.667 318.333 320.000 320.000 330.000 332.500 335.000 337.500 340.000 330.000 328.750 327.500 326.250 325.000 326.250 327.500 328.750 330.000 335.000 340.000 342.500 345.000 360.000 345.000 345.909 346.818 347.727 348.636 349.545 350.455 351.364 352.273 353.182 354.091 355.000 353.000 351.000 349.000 347.000 345.000 347.500 350.000 350.000 350.000 350.714 351.429 352.143 360.000 365.000 365.350 365.749 366.207 366.738 367.361 368.103 369.001 370.111 371.516 373.355 375.862 379.484 385.176 395.427 419.364
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 60 60 0 54 0 0 66 63 63 0 66 60 0 0 63 0 63 0 57 60 66 57 60 63 57 0 60 66 63 0 0 0 51 0 0 0 57 60 57 0 57 57 57 0 0 0 57 54 54 0 57 0 0 57 60 0 0 0 54 0 54 0 51 60 54 57 60 48 0 57 57 0 0 0 0 0 0 0 0 0 51 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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 1.171875 1.171875 1.171875 0.390625 1.171875 0.390625 1.171875 1.171875 1.171875 -1.171875 0.390625 -0.390625 0.390625 1.171875 0.390625 1.171875 1.953125 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 -1.171875 -1.953125 -1.171875 0.390625 -1.953125 -2.734375 1.953125 -0.390625 0.390625 1.171875 0.390625 0.390625 -2.734375 0.390625 -1.171875 0.390625 0.390625 2.734375 2.734375 -1.171875 1.953125 -0.390625 1.953125 -2.734375 1.171875 0.390625 0.390625 1.171875 0.390625 -0.390625 -0.390625 0.390625 1.171875 -1.171875 -0.390625 -2.734375 0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 1.171875 -1.171875 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="105">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.701 145.0 150.0 155.0 160.0 165.0 170.0 175.0 177.402 180.0 185.0 190.0 195.0 200.0 205.0 210.0 211.103 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 336.191 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0
</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 0.329 0.309 0.28 0.24 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.212 0.235 0.258 0.28 0.303 0.326 0.349 0.354 0.43 0.548 0.676 0.808 0.944 1.086 1.233 1.388 1.552 1.726 1.913 2.114 2.331 2.567 2.824 3.106 3.415 3.757 4.134 4.547 4.991 5.45 5.885 6.227 6.393 6.4 6.379 6.292 6.15 5.965 5.747 5.504 5.247 4.98 4.71 4.44 4.175 3.917 3.668 3.429 3.201 2.984 2.78 2.586 2.405 2.235 2.075 1.926 1.787 1.658 1.537 1.425 1.321 1.224 1.134 1.05 0.973 0.901 0.834 0.773 0.715 0.662 0.613 0.568 0.526 0.486 0.45 0.417 0.386 0.357 0.331 0.306 0.283 0.262 0.243 0.225 0.208

</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="6.4" PeakHeight="336.191" Num="5" zHalfNm="309.752" Error="3.023">
-104.113 -31.983 11.451 0.788 -1.231
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="101.103" Depth="0.154"/>
<TopsideChapman PeakHeight="336.191" PeakDensity="508188.6" PeakScaleHeight="20.199" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
