<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-20 -079 23:30:00.000"
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 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" >
2026.03.20 (079) 23:30:00</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">
FF202607903202330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="4.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.798" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="12.172" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="1.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="4.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="410.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="410.000" 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="4.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="434.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="399.100" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="367.344" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.762" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="48.824" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="2.758" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="25.137" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="72.590" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="50">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.9 1.95 2.0 2.05 2.1 2.15 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
425.000 415.000 415.000 413.333 411.667 410.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 415.000 415.000 450.000 442.500 435.000 427.500 420.000 415.000 415.000 415.000 415.000 417.500 420.000 420.000 421.429 422.857 424.286 425.714 427.143 428.571 430.000 430.000 432.500 435.000 431.667 428.333 425.000 435.000 430.000 431.000 432.000 433.000 434.000 445.000 452.954 468.391 511.257
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 54 57 0 0 54 0 54 54 0 54 0 0 0 57 54 0 57 0 57 57 0 0 54 0 57 60 0 0 0 0 51 0 60 57 0 57 0 0 51 54 51 0 0 0 0 54 0 0 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 1.953125 0.390625 -1.171875 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 0.390625 0.390625 -0.390625 0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -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 -1.953125 -1.171875 -0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="124">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.052 150.0 155.0 160.0 165.0 170.0 175.0 180.0 180.104 185.0 190.0 195.0 200.0 205.0 210.0 215.0 215.156 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 399.1 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.344 0.331 0.312 0.286 0.251 0.201 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.222 0.243 0.265 0.287 0.309 0.331 0.353 0.354 0.397 0.458 0.529 0.604 0.676 0.745 0.812 0.878 0.943 1.008 1.074 1.14 1.207 1.276 1.347 1.42 1.495 1.573 1.654 1.739 1.829 1.923 2.023 2.13 2.244 2.367 2.5 2.646 2.807 2.985 3.185 3.408 3.655 3.912 4.147 4.306 4.35 4.349 4.328 4.277 4.203 4.108 3.997 3.873 3.74 3.6 3.455 3.308 3.16 3.013 2.868 2.726 2.588 2.454 2.324 2.199 2.079 1.964 1.855 1.75 1.651 1.556 1.467 1.382 1.302 1.226 1.154 1.086 1.022 0.961 0.905 0.851 0.8 0.753 0.708 0.665 0.626 0.588 0.553 0.52 0.489 0.459 0.432 0.406 0.381 0.358 0.337 0.317 0.298 0.28 0.263 0.247 0.232 0.218 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="4.35" PeakHeight="399.1" Num="5" zHalfNm="367.344" Error="5.953">
-140.169 -64.261 20.427 4.432 -4.373
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="105.156" Depth="0.154"/>
<TopsideChapman PeakHeight="399.1" PeakDensity="234770.47" PeakScaleHeight="25.137" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
