<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-19 -078 10:00:00.000"
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 1 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" >
2026.03.19 (078) 10:00:00</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">
FF202607803191000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="8.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.350" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.475" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.400" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.200" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.310" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.950" 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="105.972" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="320.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.135" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="264.598" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="214.503" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.079" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.350" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="70.070" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="15.591" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="39.630" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="68.980" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.270" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="3.050" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="110">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
230.000 230.000 235.000 235.000 235.000 235.000 235.000 235.000 235.714 236.429 237.143 237.857 238.571 239.286 240.000 245.000 245.000 245.000 245.000 245.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 265.000 265.625 266.250 266.875 267.500 268.125 268.750 269.375 270.000 270.625 271.250 271.875 272.500 273.125 273.750 274.375 275.000 275.000 275.000 277.500 280.000 280.000 281.250 282.500 283.750 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 305.000 305.000 310.000 310.000 315.000 320.000 320.000 320.000 330.000 330.000 335.000 343.045 354.812 373.665 408.757 496.946
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 63 63 69 51 60 57 57 0 60 0 0 0 0 54 63 60 0 60 60 54 54 63 57 0 66 60 66 60 60 63 60 0 63 0 72 72 72 72 66 0 0 72 72 72 72 69 78 78 75 72 69 60 57 57 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 66 69 72 0 60 63 0 48 0 54 57 60 63 48 57 66 69 60 66 72 63 69 72 69 63 69 69 75 72 66 72 72 72 72 75 72 66 66 60 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 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 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="3">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.2 2.25 2.3
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.972 108.329 112.181
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 66
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="22">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 105.000 105.000 110.000 110.000 110.000 107.500 105.000 105.556 106.111 106.667 107.222 107.778 108.333 108.889 109.444 110.000 115.000 125.000 120.000 122.500 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 63 75 75 72 0 57 0 0 0 0 0 0 0 0 0 48 48 54 0 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 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -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="148">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.681 90.0 95.0 100.0 105.0 110.0 115.0 117.476 120.0 124.952 125.0 130.0 132.428 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 264.598 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.227 1.55 2.0 2.235 2.31 2.248 2.17 2.17 2.17 2.171 2.265 2.31 2.389 2.537 2.681 2.826 2.975 3.13 3.293 3.466 3.652 3.855 4.077 4.322 4.596 4.904 5.25 5.636 6.053 6.484 6.904 7.288 7.622 7.901 8.124 8.294 8.411 8.48 8.5 8.5 8.485 8.446 8.385 8.304 8.206 8.091 7.963 7.823 7.673 7.514 7.349 7.177 7.001 6.822 6.641 6.458 6.275 6.092 5.91 5.73 5.552 5.375 5.202 5.032 4.865 4.701 4.542 4.386 4.234 4.085 3.941 3.801 3.666 3.534 3.406 3.282 3.162 3.046 2.934 2.825 2.72 2.619 2.521 2.427 2.336 2.248 2.163 2.082 2.003 1.927 1.854 1.783 1.715 1.65 1.587 1.526 1.468 1.412 1.358 1.306 1.256 1.208 1.161 1.117 1.074 1.032 0.993 0.955 0.918 0.882 0.849 0.816 0.784 0.754 0.725 0.697 0.67 0.644 0.62 0.596 0.573 0.551 0.529 0.509 0.489 0.47 0.452 0.435 0.418 0.402 0.386 0.371 0.357 0.343 0.33 0.317 0.305 0.293 0.282 0.271 0.26 0.25 0.241 0.231 0.222 0.214 0.206

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.31" PeakHeight="110.0" Num="3" Error="0.0">
-29.493 11.699 -2.525
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.31" EndFrequency="8.5" PeakHeight="264.598" Num="5" zHalfNm="214.503" Error="2.382">
-111.802 -15.191 -8.658 2.924 0.557
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="22.428" Depth="0.14"/>
<TopsideChapman PeakHeight="264.598" PeakDensity="896402.0" PeakScaleHeight="39.63" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
