<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 10:10:00.000"
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 0 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" >
2026.04.01 (091) 10:10:00</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">
FF202609104011010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="9.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.175" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.114" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.100" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.310" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="230.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="230.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="115.258" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="102.895" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="12.693" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="357.436" 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="2.279" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="280.711" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="224.401" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.163" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="77.480" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="22.098" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="42.274" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="81.360" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.830" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="139">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
250.000 245.000 240.000 235.000 235.000 230.000 230.000 230.000 230.000 230.000 230.000 230.000 230.000 230.000 230.000 231.250 232.500 233.750 235.000 235.000 235.000 235.000 237.500 240.000 240.000 240.000 241.250 242.500 243.750 245.000 245.000 245.000 245.000 245.000 245.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 255.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 265.000 265.000 265.000 267.500 270.000 272.500 275.000 275.000 275.000 275.000 275.000 275.000 275.000 280.000 281.250 282.500 283.750 285.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 300.000 302.500 305.000 305.000 307.500 310.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 325.000 325.000 330.000 330.000 330.000 330.000 335.000 340.000 340.000 340.000 345.000 345.000 350.000 355.000 355.000 357.436 360.385 364.031 368.652 374.699 382.955 394.898 413.711 447.713
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 66 60 63 66 66 66 66 66 66 66 63 66 63 66 0 63 0 60 57 51 48 0 60 57 63 0 0 0 69 66 66 0 57 54 63 66 63 57 57 63 60 54 63 0 0 0 0 60 0 66 69 72 69 69 0 57 72 69 0 66 69 60 0 0 0 69 69 72 72 72 69 69 69 0 0 0 60 66 69 72 0 72 66 72 72 57 0 60 66 0 69 72 69 66 69 72 0 72 66 69 69 57 63 66 69 57 63 66 69 69 69 69 72 69 66 66 60 66 69 66 69 63 72 72 72 72 69 63 72 69 69 63 63 66 60 60 57 45
</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 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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>
<Trace Type="standard" Layer="E" Polarization="O" Num="5">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.1 2.15 2.2 2.25 2.3
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.258 116.123 117.107 118.250 119.619
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 60 0 0 54
</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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="162">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 95.0 100.0 102.895 105.0 109.607 110.0 115.0 116.318 120.0 123.03 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 280.711 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 1.815 2.248 2.31 2.298 2.181 2.181 2.181 2.181 2.252 2.31 2.35 2.454 2.563 2.679 2.803 2.935 3.078 3.233 3.401 3.586 3.789 4.012 4.259 4.53 4.827 5.148 5.491 5.851 6.222 6.599 6.975 7.345 7.707 8.057 8.391 8.705 8.994 9.253 9.472 9.642 9.754 9.799 9.8 9.79 9.756 9.698 9.62 9.523 9.408 9.279 9.136 8.982 8.818 8.645 8.465 8.28 8.09 7.897 7.702 7.504 7.307 7.109 6.912 6.716 6.522 6.33 6.14 5.954 5.77 5.59 5.414 5.241 5.072 4.907 4.747 4.59 4.437 4.289 4.144 4.004 3.868 3.735 3.607 3.483 3.362 3.245 3.132 3.023 2.917 2.815 2.715 2.62 2.527 2.437 2.351 2.267 2.187 2.109 2.034 1.961 1.891 1.823 1.758 1.695 1.634 1.575 1.518 1.464 1.411 1.36 1.311 1.264 1.218 1.174 1.132 1.091 1.052 1.014 0.977 0.942 0.908 0.875 0.843 0.813 0.783 0.755 0.728 0.701 0.676 0.651 0.628 0.605 0.583 0.562 0.542 0.522 0.503 0.485 0.467 0.45 0.434 0.418 0.403 0.388 0.374 0.361 0.348 0.335 0.323 0.311 0.3 0.289 0.279 0.268 0.259 0.249 0.24 0.232 0.223 0.215 0.207

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.31" PeakHeight="102.895" Num="3" Error="5.62">
-18.717 7.425 -1.603
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.31" EndFrequency="9.8" PeakHeight="280.711" Num="5" zHalfNm="224.401" Error="3.345">
-126.872 -26.312 -3.0 -2.567 1.07
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="20.135" Depth="0.129"/>
<TopsideChapman PeakHeight="280.711" PeakDensity="1191563.2" PeakScaleHeight="42.274" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
