<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-18 -077 21:40:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, 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" >
2026.03.18 (077) 21:40:00</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">
FF202607703182140009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="11.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.759" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.899" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.600" 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="10.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="462.366" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.514" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="384.124" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="337.633" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.058" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="69.717" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="23.785" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="34.761" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="77.510" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.320" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="164">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
315.000 320.000 320.000 320.000 320.000 320.000 320.000 325.000 330.000 328.750 327.500 326.250 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 335.000 335.833 336.667 337.500 338.333 339.167 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 341.667 343.333 345.000 346.667 348.333 350.000 350.000 351.250 352.500 353.750 355.000 355.000 355.714 356.429 357.143 357.857 358.571 359.286 360.000 360.714 361.429 362.143 362.857 363.571 364.286 365.000 365.714 366.429 367.143 367.857 368.571 369.286 370.000 370.000 370.000 371.250 372.500 373.750 375.000 376.250 377.500 378.750 380.000 380.625 381.250 381.875 382.500 383.125 383.750 384.375 385.000 385.000 387.500 390.000 390.000 390.000 390.000 392.500 395.000 395.000 395.000 390.000 392.500 395.000 395.000 395.000 397.500 400.000 400.000 400.000 400.000 402.500 405.000 407.500 410.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 420.000 425.000 425.000 425.000 425.000 425.000 425.000 430.000 430.000 430.000 430.000 430.000 440.000 440.000 440.000 440.000 440.000 445.000 445.000 445.000 445.000 450.000 450.000 451.152 452.446 453.909 455.578 457.499 459.734 462.366 465.512 469.338 474.092 480.159 488.169 499.232
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 63 0 0 66 0 63 60 48 48 0 0 0 66 63 63 0 0 57 57 0 0 0 0 0 63 69 0 0 0 0 0 69 51 0 0 60 0 0 57 72 54 0 69 0 0 0 75 78 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 66 69 0 0 0 51 0 0 0 63 0 0 0 0 51 0 0 63 60 57 57 0 63 66 57 63 66 63 57 0 57 63 66 0 69 0 69 72 0 69 0 63 0 69 72 57 0 66 45 72 60 60 63 63 51 54 0 0 69 66 66 66 66 60 57 48 57 57 63 63 60 0 60 48 48 48 0 48 54 57 54 54 54 57 51 51 51 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="164">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
91.553 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 137.746 140.0 145.0 150.0 155.0 160.0 165.0 165.493 170.0 175.0 180.0 185.0 190.0 193.239 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 384.124 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.34 0.445 0.498 0.514 0.507 0.486 0.449 0.39 0.298 0.219 0.219 0.219 0.219 0.219 0.219 0.219 0.219 0.267 0.32 0.373 0.426 0.48 0.514 0.563 0.69 0.813 0.94 1.072 1.213 1.362 1.52 1.689 1.869 2.06 2.263 2.477 2.704 2.943 3.195 3.459 3.736 4.027 4.331 4.649 4.98 5.325 5.685 6.058 6.446 6.848 7.263 7.69 8.128 8.575 9.026 9.475 9.913 10.324 10.686 10.973 11.152 11.2 11.199 11.17 11.1 10.994 10.856 10.69 10.5 10.289 10.061 9.819 9.566 9.305 9.037 8.765 8.49 8.215 7.941 7.669 7.399 7.134 6.872 6.617 6.366 6.122 5.885 5.654 5.429 5.212 5.001 4.798 4.601 4.412 4.229 4.053 3.883 3.72 3.563 3.412 3.267 3.127 2.994 2.866 2.742 2.624 2.511 2.403 2.299 2.199 2.104 2.013 1.925 1.841 1.761 1.685 1.611 1.541 1.474 1.409 1.348 1.289 1.232 1.178 1.127 1.077 1.03 0.985 0.942 0.901 0.861 0.823 0.787 0.753 0.72 0.688 0.658 0.629 0.601 0.575 0.55 0.526 0.502 0.48 0.459 0.439 0.42 0.401 0.384 0.367 0.351 0.335 0.321 0.307 0.293 0.28 0.268 0.256 0.245 0.234 0.224 0.214 0.205

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.514" PeakHeight="110.0" Num="3" Error="0.0">
-22.527 4.505 -0.425
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.514" EndFrequency="11.2" PeakHeight="384.124" Num="5" zHalfNm="337.633" Error="2.197">
-168.799 -37.435 17.357 -3.027 1.019
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="83.239" Depth="0.295"/>
<TopsideChapman PeakHeight="384.124" PeakDensity="1556327.5" PeakScaleHeight="34.761" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
