<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-21 -080 17:50:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp</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) 17:50:00</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">
FF202608003211750009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="12.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.649" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.317" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.350" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.900" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.260" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="270.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="270.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="107.043" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="115.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="101.183" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="10.911" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="460.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.099" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.223" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="361.416" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="267.797" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.351" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.300" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="126.545" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="57.427" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="70.965" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="155.620" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.410" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="152">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
270.000 270.000 270.000 275.000 276.667 278.333 280.000 281.667 283.333 285.000 285.000 287.500 290.000 290.000 290.000 290.000 290.000 295.000 295.000 300.000 300.000 302.500 305.000 305.000 305.000 305.000 305.000 305.000 310.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 330.000 330.000 332.500 335.000 335.000 340.000 340.000 340.000 340.000 340.000 345.000 346.667 348.333 350.000 350.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 360.000 360.000 360.000 360.000 370.000 371.000 372.000 373.000 374.000 375.000 375.000 380.000 380.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 385.000 385.000 385.000 387.500 390.000 390.000 395.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 412.000 414.000 416.000 418.000 420.000 420.000 422.500 425.000 425.000 425.000 425.000 425.000 430.000 432.500 435.000 437.500 440.000 440.000 445.000 445.000 450.000 450.000 455.000 455.000 455.000 457.500 460.000 460.000 460.000 460.000 465.000 470.000 475.017 480.453 486.361 492.807 499.868 507.635 516.220 525.761 536.424 548.422 562.022 577.566 595.505 616.437
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 54 51 48 0 0 0 0 0 48 54 51 57 0 0 60 57 63 60 57 60 0 57 0 66 63 0 54 66 60 63 63 60 63 0 0 66 66 0 66 66 66 0 63 63 54 0 60 60 57 57 0 0 54 0 60 63 63 0 66 63 66 66 66 0 57 60 0 0 0 0 66 69 60 0 0 66 66 66 69 69 69 66 63 54 0 69 66 66 0 69 66 63 66 66 63 66 63 60 63 69 66 63 63 66 66 0 0 0 0 51 57 0 45 0 54 60 60 54 0 51 0 51 54 45 51 45 51 48 51 51 0 42 45 0 42 45 0 45 0 0 0 0 0 0 0 45 51 48 48 51 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 -1.953125 -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 -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 -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 -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 -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 -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 -0.390625 1.953125 -0.390625 -0.390625 1.171875 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 2.734375 -0.390625 1.953125 -0.390625 -0.390625 1.953125 -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 1.953125 -2.734375 -1.171875 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="8">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
107.043 107.883 108.839 109.948 111.278 112.951 115.239 119.007
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 0 0 0 0 51 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 1.953125 0.390625 2.734375 0.390625 0.390625 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="22">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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" >
115.000 115.000 116.667 118.333 120.000 121.667 123.333 125.000 126.667 128.333 130.000 130.000 130.000 130.000 128.750 127.500 126.250 125.000 125.000 125.000 125.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 54 0 0 0 0 0 0 0 0 51 51 51 51 0 0 0 60 60 63 60 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 0.390625 -2.734375 1.953125 -1.171875 -2.734375 2.734375 -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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 95.0 100.0 101.183 103.961 105.0 106.74 109.518 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 361.416 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.688 3.24 3.26 3.132 3.132 3.132 3.26 3.274 3.417 3.553 3.685 3.815 3.944 4.073 4.203 4.335 4.468 4.604 4.743 4.884 5.029 5.178 5.33 5.487 5.649 5.815 5.986 6.163 6.346 6.534 6.728 6.927 7.133 7.345 7.563 7.787 8.017 8.251 8.491 8.735 8.982 9.232 9.484 9.736 9.988 10.238 10.483 10.723 10.955 11.176 11.384 11.575 11.747 11.896 12.018 12.111 12.172 12.199 12.2 12.197 12.183 12.158 12.123 12.078 12.023 11.96 11.889 11.809 11.723 11.63 11.53 11.425 11.315 11.2 11.08 10.956 10.829 10.698 10.564 10.428 10.29 10.149 10.007 9.864 9.719 9.574 9.428 9.281 9.134 8.988 8.841 8.695 8.549 8.403 8.259 8.115 7.973 7.831 7.69 7.551 7.413 7.277 7.142 7.008 6.876 6.746 6.617 6.49 6.365 6.241 6.119 5.999 5.881 5.765 5.65 5.537 5.426 5.317 5.21 5.104 5.001 4.899 4.798 4.7 4.603 4.509 4.415 4.324 4.234 4.146 4.06 3.975 3.892 3.81 3.73 3.652 3.575 3.5 3.426 3.353 3.282 3.213 3.144 3.078 3.012 2.948 2.885 2.824 2.763 2.704 2.646 2.59 2.534 2.48 2.427 2.375 2.324 2.274 2.225 2.177 2.13 2.084 2.039 1.995 1.952 1.91 1.869 1.829 1.789 1.75 1.713 1.676 1.639 1.604 1.569 1.535 1.502 1.469 1.438 1.406 1.376 1.346 1.317 1.288 1.26 1.233 1.206

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.26" PeakHeight="101.183" Num="3" Error="2.521">
-16.588 7.097 -1.692
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.26" EndFrequency="12.2" PeakHeight="361.416" Num="5" zHalfNm="267.797" Error="3.626">
-206.315 -51.281 3.24 1.462 0.996
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="8.335" Depth="0.128"/>
<TopsideChapman PeakHeight="361.416" PeakDensity="1846650.1" PeakScaleHeight="70.965" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
