<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-16 -075 18:40:00.000"
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: 85% PACIFIC flags: Multiple candidates for F2x 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" >
2026.03.16 (075) 18:40:00</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">
FF202607503161840009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="11.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.668" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.753" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="6.000" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="355.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="355.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="471.951" 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="2.873" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="354.902" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="272.502" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.548" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.400" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="111.212" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="48.601" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="62.078" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="154.480" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.030" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="111">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
355.000 355.000 355.000 357.500 360.000 360.000 365.000 365.000 365.000 365.000 367.500 370.000 370.000 370.000 371.000 372.000 373.000 374.000 375.000 380.000 380.000 380.000 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 405.000 405.000 405.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 410.000 410.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 420.000 420.000 420.000 430.000 427.500 425.000 427.500 430.000 430.000 435.000 435.000 435.000 440.000 442.500 445.000 445.000 447.500 450.000 450.000 455.000 460.000 460.000 461.934 464.062 466.414 469.028 471.951 475.241 478.970 483.235 488.158 493.905 500.702 508.865 518.853 531.354 547.453 568.965
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 54 0 60 63 60 0 69 72 0 75 75 72 0 0 0 0 66 75 72 69 69 72 75 72 69 72 72 72 69 66 63 69 72 72 69 69 69 69 69 63 0 60 63 63 0 60 63 66 66 69 69 72 72 69 72 72 72 72 69 69 69 72 72 72 72 75 72 69 69 69 72 72 69 69 54 54 66 0 63 63 63 60 63 57 0 51 57 0 51 57 51 45 51 54 51 51 42 45 48 51 51 54 54 54 0 0 0 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 -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 -1.171875 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 2.734375 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -1.953125 1.953125 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="53">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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" >
120.000 120.000 120.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 114.286 113.571 112.857 112.143 111.429 110.714 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.625 111.250 111.875 112.500 113.125 113.750 114.375 115.000 115.000 115.000 114.375 113.750 113.125 112.500 111.875 111.250 110.625 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 60 60 57 57 51 0 48 66 63 0 54 0 0 48 0 0 0 69 66 0 0 0 63 66 66 69 63 0 0 0 0 0 0 0 69 66 66 0 0 0 0 0 0 0 63 60 0 63 60 0 72 72
</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 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
</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" >
89.568 90.0 95.0 100.0 105.0 110.0 113.793 115.0 117.585 120.0 121.378 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 354.902 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.235 1.931 2.487 2.78 2.873 2.751 2.751 2.751 2.829 2.873 3.016 3.228 3.446 3.66 3.864 4.06 4.248 4.429 4.605 4.776 4.945 5.111 5.276 5.44 5.604 5.767 5.931 6.097 6.263 6.432 6.603 6.776 6.952 7.132 7.316 7.504 7.696 7.894 8.098 8.307 8.523 8.747 8.978 9.216 9.463 9.716 9.977 10.242 10.509 10.774 11.03 11.268 11.481 11.658 11.791 11.873 11.9 11.9 11.892 11.87 11.835 11.787 11.726 11.655 11.573 11.482 11.381 11.273 11.157 11.034 10.905 10.77 10.631 10.487 10.339 10.187 10.033 9.876 9.717 9.557 9.395 9.233 9.069 8.906 8.742 8.579 8.416 8.253 8.092 7.932 7.772 7.615 7.458 7.304 7.151 6.999 6.85 6.703 6.558 6.415 6.274 6.135 5.999 5.865 5.733 5.603 5.476 5.351 5.228 5.108 4.99 4.874 4.761 4.649 4.54 4.434 4.329 4.227 4.127 4.029 3.933 3.839 3.747 3.658 3.57 3.484 3.4 3.318 3.238 3.16 3.083 3.008 2.935 2.864 2.794 2.726 2.66 2.595 2.532 2.47 2.409 2.35 2.293 2.236 2.181 2.128 2.076 2.025 1.975 1.926 1.879 1.832 1.787 1.743 1.7 1.658 1.617 1.577 1.538 1.5 1.463 1.427 1.392 1.357 1.324 1.291 1.259 1.228 1.198 1.168 1.139 1.111 1.083 1.056 1.03 1.005 0.98 0.955 0.932 0.909 0.886 0.864 0.843 0.822 0.801 0.782 0.762

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.873" PeakHeight="110.0" Num="3" Error="0.0">
-30.086 12.543 -2.889
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.873" EndFrequency="11.9" PeakHeight="354.902" Num="5" zHalfNm="272.502" Error="4.638">
-193.855 -59.469 18.842 3.882 -2.924
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="11.378" Depth="0.122"/>
<TopsideChapman PeakHeight="354.902" PeakDensity="1756947.9" PeakScaleHeight="62.078" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
