<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-21 -080 21:30:00.000"
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 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, 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" >
2026.03.21 (080) 21:30:00</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">
FF202608003212130009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.674" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.211" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.750" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="1.750" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="290.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="290.000" 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="0.550" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="476.526" 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="0.636" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="1.750" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="1.750" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="383.573" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="323.398" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.172" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="88.219" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="26.293" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="44.175" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="90.480" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.790" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="177">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.75 1.8 1.85 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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
290.000 290.000 292.500 295.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 295.000 290.000 291.250 292.500 293.750 295.000 295.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 301.667 303.333 305.000 306.667 308.333 310.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 311.667 313.333 315.000 316.667 318.333 320.000 320.000 321.250 322.500 323.750 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 332.500 335.000 335.000 335.000 335.000 335.000 337.500 340.000 335.000 335.000 335.000 337.500 340.000 342.500 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 350.000 351.250 352.500 353.750 355.000 356.667 358.333 360.000 361.667 363.333 365.000 365.000 365.000 365.000 370.000 370.000 370.000 370.000 370.000 370.000 375.000 375.000 375.000 375.000 380.000 380.000 382.500 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 410.000 415.000 420.000 420.000 420.000 420.000 425.000 425.000 425.000 430.000 430.000 435.000 435.000 440.000 440.000 440.000 445.000 450.000 450.000 455.000 455.000 460.000 460.000 460.000 465.000 465.000 465.000 466.800 468.809 471.064 473.616 476.526 479.876 483.772 488.362 493.847 500.519 508.809 519.386 533.351
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 0 57 60 0 57 0 0 0 0 60 57 57 63 54 0 0 0 69 69 69 0 0 0 0 69 0 69 0 0 69 69 0 0 0 0 0 69 69 69 54 66 63 63 60 0 0 0 0 0 0 66 69 0 0 0 63 66 0 0 69 60 0 0 66 69 0 57 63 0 66 69 0 57 63 0 69 0 57 0 66 0 69 57 60 66 66 0 69 0 63 0 69 0 0 63 0 51 57 0 0 69 57 60 66 66 57 72 66 66 0 72 66 69 57 63 69 72 57 63 69 72 75 75 72 75 66 69 72 63 69 69 72 66 69 72 72 72 60 66 72 72 69 69 69 69 69 66 69 66 69 66 69 63 66 60 66 60 54 63 63 60 63 0 60 54 57 51 54 54 51 54 51 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 0.390625 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.968 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 135.989 140.0 145.0 150.0 155.0 160.0 161.979 165.0 170.0 175.0 180.0 185.0 187.968 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 383.573 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.422 0.551 0.616 0.636 0.627 0.599 0.549 0.472 0.344 0.307 0.307 0.307 0.307 0.307 0.307 0.307 0.345 0.409 0.472 0.535 0.598 0.636 0.683 0.783 0.878 0.975 1.078 1.189 1.313 1.451 1.606 1.783 1.984 2.212 2.468 2.751 3.057 3.382 3.719 4.065 4.415 4.768 5.121 5.474 5.827 6.178 6.528 6.877 7.225 7.57 7.914 8.253 8.588 8.916 9.234 9.537 9.819 10.07 10.282 10.439 10.53 10.55 10.549 10.529 10.485 10.419 10.333 10.228 10.108 9.972 9.824 9.664 9.495 9.318 9.133 8.943 8.748 8.55 8.349 8.146 7.942 7.738 7.535 7.333 7.132 6.932 6.736 6.542 6.35 6.162 5.978 5.797 5.619 5.446 5.276 5.111 4.949 4.792 4.638 4.489 4.343 4.202 4.064 3.931 3.801 3.676 3.553 3.435 3.32 3.209 3.101 2.997 2.896 2.798 2.703 2.611 2.523 2.437 2.354 2.273 2.196 2.12 2.048 1.978 1.91 1.844 1.781 1.719 1.66 1.603 1.548 1.494 1.443 1.393 1.345 1.298 1.254 1.21 1.168 1.128 1.089 1.051 1.015 0.98 0.946 0.913 0.881 0.851 0.821 0.793 0.765 0.739 0.713 0.688 0.664 0.641 0.619 0.598 0.577 0.557 0.538 0.519 0.501 0.483 0.467 0.45 0.435 0.42 0.405 0.391 0.377 0.364 0.352 0.339 0.328 0.316 0.305 0.295 0.284 0.275 0.265 0.256 0.247 0.238 0.23 0.222

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.636" PeakHeight="110.0" Num="3" Error="0.0">
-24.059 5.674 -0.647
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.636" EndFrequency="10.55" PeakHeight="383.573" Num="5" zHalfNm="323.398" Error="5.134">
-180.421 -21.134 9.421 -7.539 4.068
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="77.968" Depth="0.329"/>
<TopsideChapman PeakHeight="383.573" PeakDensity="1380924.4" PeakScaleHeight="44.175" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
