<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-18 -077 00:00:00.000"
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 33 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Moderate F-spread, F2o cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other</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) 00:00:00</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">
FF202607703180000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="5.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.901" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="16.534" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="340.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="340.000" 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="5.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="405.000" 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="2.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="387.310" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="362.525" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.512" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="39.401" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="3.713" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="19.191" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="61.660" 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="63">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
340.000 340.000 340.000 340.000 340.000 340.000 361.667 383.333 405.000 440.000 445.000 450.000 460.000 470.000 480.000 490.000 480.000 470.000 460.000 380.000 375.000 390.000 390.000 400.000 390.000 417.500 445.000 430.000 415.000 400.000 402.500 405.000 400.000 400.000 397.500 395.000 392.500 390.000 387.500 385.000 395.000 395.000 395.000 395.000 395.000 395.000 385.000 385.000 385.000 385.000 385.000 385.000 388.333 391.667 395.000 400.000 405.000 415.000 425.000 432.500 440.000 442.500 445.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0 0 57 0 0 57 51 0 51 0 0 51 51 54 0 54 51 0 51 51 0 54 0 48 51 0 51 0 54 57 60 54 0 51 0 54 54 51 0 54 0 0 54 57 0 0 51 0 57 0 0 57 0 51 51 51 0 48 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 1.171875 0.390625 1.171875 -0.390625 -1.171875 0.390625 -0.390625 0.390625 -0.390625 -1.953125 1.171875 1.171875 -0.390625 -1.171875 -1.171875 -0.390625 0.390625 1.171875 -0.390625 1.171875 -1.171875 0.390625 0.390625 -1.953125 1.171875 -1.171875 1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 0.390625 -1.953125 1.171875 1.171875 0.390625 -0.390625 -1.171875 -1.953125 0.390625 2.734375 -0.390625 -0.390625 -1.171875 1.953125 -0.390625 -1.171875 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="111">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.823 150.0 155.0 160.0 165.0 170.0 175.0 180.0 181.645 185.0 190.0 195.0 200.0 205.0 210.0 215.0 217.468 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 387.31 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0
</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 0.332 0.314 0.289 0.256 0.209 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.214 0.236 0.257 0.279 0.3 0.322 0.343 0.354 0.372 0.417 0.481 0.568 0.67 0.774 0.877 0.977 1.076 1.174 1.272 1.371 1.472 1.575 1.68 1.789 1.902 2.019 2.141 2.269 2.404 2.547 2.698 2.859 3.032 3.219 3.423 3.646 3.894 4.173 4.489 4.853 5.265 5.638 5.7 5.689 5.618 5.491 5.319 5.115 4.887 4.645 4.394 4.14 3.889 3.642 3.403 3.173 2.954 2.745 2.549 2.363 2.19 2.027 1.876 1.734 1.603 1.481 1.368 1.263 1.166 1.076 0.993 0.916 0.845 0.779 0.719 0.663 0.611 0.564 0.52 0.479 0.442 0.407 0.376 0.346 0.319 0.294 0.271 0.25 0.231 0.212

</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="5.7" PeakHeight="387.31" Num="5" zHalfNm="362.525" Error="11.787">
-125.407 -65.484 26.25 -1.495 -3.706
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="107.468" Depth="0.154"/>
<TopsideChapman PeakHeight="387.31" PeakDensity="403101.75" PeakScaleHeight="19.191" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
