<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-20 -079 08:30:00.000"
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 55 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 25% PACIFIC flags: F2x cusp not found, 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" >
2026.03.20 (079) 08:30:00</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">
FF202607903200830009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="2.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.854" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="6.849" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="6.000" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.100" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="2.800" 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="34" Val="125.000" Name="h`Es" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="2.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="452.516" 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="0.521" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.100" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.100" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="339.049" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="276.477" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.158" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.450" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="84.328" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="1.390" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="43.867" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="98.630" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.410" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.1 2.15 2.2 2.25 2.3 2.35 2.4
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
410.000 416.667 423.333 427.095 432.305 440.000 452.516
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 57 51 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 1.171875 1.171875 0.390625 0.390625 0.390625 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="72">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
130.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 135.000 133.750 132.500 131.250 130.000 128.750 127.500 126.250 125.000 130.000 137.500 145.000 142.857 140.714 138.571 136.429 134.286 132.143 130.000 125.000 125.156 125.313 125.469 125.625 125.781 125.938 126.094 126.250 126.406 126.563 126.719 126.875 127.031 127.188 127.344 127.500 127.656 127.813 127.969 128.125 128.281 128.438 128.594 128.750 128.906 129.063 129.219 129.375 129.531 129.688 129.844 130.000 130.000 129.375 128.750 128.125 127.500 126.875 126.250 125.625 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 66 0 57 0 0 0 0 0 66 0 66 0 54 0 0 0 0 0 66 66 0 0 0 0 0 0 57 0 60 60 0 0 0 0 0 0 0 0 0 0 0 0 0 63 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 51
</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 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 1.953125 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 -0.390625 1.953125 2.734375 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 1.953125 2.734375 2.734375 1.953125 -0.390625 1.953125 2.734375 2.734375 2.734375 2.734375 2.734375 1.953125 2.734375 2.734375 1.953125 2.734375 2.734375 2.734375 2.734375 2.734375 1.171875 2.734375 2.734375 0.390625 2.734375 1.953125 -2.734375 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="138">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
91.509 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 137.645 140.0 145.0 150.0 155.0 160.0 165.0 165.29 170.0 175.0 180.0 185.0 190.0 192.935 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 339.049 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.345 0.451 0.504 0.521 0.514 0.492 0.454 0.395 0.3 0.223 0.223 0.223 0.223 0.223 0.223 0.223 0.223 0.274 0.328 0.382 0.435 0.489 0.521 0.546 0.601 0.657 0.716 0.78 0.849 0.923 1.001 1.082 1.163 1.243 1.321 1.397 1.47 1.541 1.61 1.677 1.743 1.808 1.872 1.936 1.999 2.061 2.123 2.185 2.245 2.302 2.353 2.39 2.4 2.4 2.396 2.386 2.371 2.352 2.328 2.301 2.27 2.236 2.2 2.161 2.12 2.078 2.035 1.99 1.944 1.898 1.852 1.805 1.759 1.712 1.666 1.62 1.574 1.529 1.485 1.441 1.398 1.356 1.314 1.274 1.234 1.195 1.158 1.121 1.085 1.05 1.016 0.982 0.95 0.919 0.888 0.859 0.83 0.803 0.776 0.749 0.724 0.7 0.676 0.653 0.631 0.609 0.588 0.568 0.549 0.53 0.512 0.494 0.477 0.461 0.445 0.429 0.414 0.4 0.386 0.373 0.36 0.347 0.335 0.324 0.312 0.302 0.291 0.281 0.271 0.262 0.253 0.244 0.235 0.227 0.219 0.212 0.204

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.521" PeakHeight="110.0" Num="3" Error="0.0">
-22.634 4.582 -0.439
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.521" EndFrequency="2.4" PeakHeight="339.049" Num="5" zHalfNm="276.477" Error="3.69">
-129.619 -27.494 16.88 -8.378 2.497
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="82.935" Depth="0.298"/>
<TopsideChapman PeakHeight="339.049" PeakDensity="71464.02" PeakScaleHeight="43.867" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
