<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 15:10:00.000"
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 1 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x 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" >
2026.04.03 (093) 15:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609304031510009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="33" >
<URSI ID="00" Val="13.675" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="6.273" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.487" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="33.946" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.300" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.460" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="14.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="230.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="330.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="104.371" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="96.838" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="6.662" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="13.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="525.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.025" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.396" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.363" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="377.156" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="204.261" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="277.866" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.611" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="118.383" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="68.941" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="73.749" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="71.984" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="161.480" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.340" Name="B1" QL="/" DL="/" />
<URSI ID="D2" Val="0.320" Name="D1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="148">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 12.25 12.3 12.35 12.4 12.45 12.5 12.55 12.6 12.65 12.7 12.75 12.8 12.85 12.9 12.95 13.0 13.05 13.1 13.15 13.2 13.25 13.3 13.35 13.4 13.45 13.5 13.55 13.6 13.65
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 342.500 345.000 345.000 350.000 347.500 345.000 345.000 345.000 345.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 355.000 356.667 358.333 360.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 390.000 392.500 395.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 410.000 415.000 415.000 415.000 420.000 420.000 420.000 420.000 421.250 422.500 423.750 425.000 430.000 430.000 430.000 430.000 435.000 435.000 435.000 437.500 440.000 445.000 446.250 447.500 448.750 450.000 450.000 455.000 455.000 455.000 460.000 460.000 465.000 470.000 470.000 470.000 472.000 474.000 476.000 478.000 480.000 485.000 485.000 490.000 495.000 495.000 495.000 495.000 500.000 505.000 505.000 505.000 510.000 512.500 515.000 520.000 520.000 525.000 525.000 535.000 535.000 540.000 545.000 550.000 555.000 560.000 565.000 571.943 579.938 589.244 600.212 613.332
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 51 54 54 51 63 63 60 57 54 54 57 60 60 60 57 66 66 0 66 63 0 63 63 48 0 69 66 63 63 72 69 72 69 72 72 69 60 0 0 66 63 63 63 60 63 66 66 57 60 63 54 60 66 66 63 66 63 66 63 0 66 60 66 66 63 60 60 51 54 57 60 57 57 57 45 54 54 54 57 54 54 57 57 0 0 0 57 54 57 0 54 54 0 51 0 54 48 0 0 0 54 51 51 51 54 54 60 57 48 54 57 0 0 48 0 51 51 54 51 42 48 0 51 51 48 51 48 48 0 51 48 45 48 48 48 45 45 0 45 48 48 42 45 45 0 42 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -2.734375 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 1.171875 0.390625 0.390625 0.390625 0.390625 -1.171875 0.390625 1.171875 0.390625 0.390625 0.390625 1.171875 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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="30">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
230.000 235.000 240.000 245.000 250.000 255.000 258.125 261.250 264.375 267.500 270.625 273.750 276.875 280.000 285.000 285.000 290.000 293.182 296.364 299.545 302.727 305.909 309.091 312.273 315.455 318.636 321.818 325.000 326.667 328.333
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 48 51 51 48 0 0 0 0 0 0 0 51 51 57 57 0 0 0 0 0 45 0 0 0 0 45 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 2.734375 2.734375 -1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.953125 -0.390625 1.953125 1.171875 2.734375 0.390625 -0.390625 -0.390625 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.3 3.35 3.4 3.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
104.371 105.471 106.789 108.449
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 0.390625 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 95.0 96.838 98.362 99.887 100.0 101.411 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 204.261 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 377.156 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 3.322 3.46 3.335 3.335 3.344 3.46 3.577 3.73 3.878 4.023 4.167 4.311 4.453 4.593 4.732 4.869 5.003 5.135 5.266 5.395 5.523 5.652 5.782 5.915 6.052 6.194 6.273 6.307 6.526 6.733 6.935 7.137 7.343 7.554 7.772 7.999 8.234 8.478 8.731 8.99 9.253 9.518 9.782 10.044 10.301 10.551 10.796 11.034 11.265 11.491 11.71 11.924 12.134 12.339 12.541 12.738 12.931 13.118 13.296 13.459 13.591 13.667 13.675 13.673 13.66 13.634 13.597 13.55 13.492 13.424 13.347 13.262 13.169 13.068 12.96 12.846 12.726 12.6 12.469 12.334 12.195 12.052 11.905 11.756 11.604 11.45 11.294 11.136 10.977 10.817 10.656 10.494 10.332 10.17 10.008 9.846 9.684 9.523 9.363 9.204 9.045 8.888 8.732 8.577 8.423 8.271 8.121 7.972 7.825 7.679 7.536 7.394 7.254 7.115 6.979 6.845 6.712 6.582 6.453 6.327 6.202 6.08 5.959 5.84 5.724 5.609 5.496 5.386 5.277 5.17 5.065 4.962 4.86 4.761 4.663 4.567 4.473 4.381 4.291 4.202 4.115 4.029 3.946 3.864 3.783 3.704 3.627 3.551 3.476 3.404 3.332 3.262 3.194 3.126 3.06 2.996 2.933 2.871 2.81 2.751 2.693 2.636 2.58 2.525 2.471 2.419 2.368 2.317 2.268 2.22 2.173 2.126 2.081 2.037 1.994 1.951 1.909 1.869 1.829 1.79 1.752 1.714 1.678 1.642 1.607 1.572 1.539 1.506

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.46" PeakHeight="96.838" Num="3" Error="2.22">
-10.176 4.405 -1.067
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.46" EndFrequency="6.273" PeakHeight="204.261" Num="5" Error="0.0">
-76.235 -36.268 12.058 -3.139 0.734
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="6.273" EndFrequency="13.675" PeakHeight="377.156" Num="5" zHalfNm="277.866" Error="4.595">
-140.746 -41.019 13.086 -6.751 2.535
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.573" Depth="0.125"/>
<TopsideChapman PeakHeight="377.156" PeakDensity="2320169.0" PeakScaleHeight="71.984" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
