<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-17 -076 10:40:00.000"
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="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" >
2026.03.17 (076) 10:40:00</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">
FF202607603171040009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="9.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.101" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.146" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.900" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="1.900" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.560" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.750" 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="110.871" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="115.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="105.700" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="15.412" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.950" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="366.646" 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="2.529" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="284.835" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="223.522" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.823" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.600" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="83.095" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="22.716" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="46.939" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="102.660" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.420" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="112">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
230.000 235.000 235.000 236.667 238.333 240.000 245.000 245.000 250.000 250.000 250.000 255.000 255.000 255.000 255.000 255.000 260.000 260.000 260.000 261.250 262.500 263.750 265.000 265.000 265.000 266.667 268.333 270.000 275.000 275.833 276.667 277.500 278.333 279.167 280.000 280.000 280.000 280.000 285.000 285.000 285.000 285.000 290.000 287.500 285.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 292.500 295.000 300.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 306.250 307.500 308.750 310.000 311.250 312.500 313.750 315.000 315.000 315.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 340.000 340.000 345.000 345.000 345.000 345.000 350.000 355.000 355.000 360.000 361.904 364.096 366.646 369.650 373.240 377.606 383.032 389.956 399.096 411.723 430.298 460.321
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 51 45 0 0 0 54 57 57 60 60 57 60 60 57 51 48 54 54 0 0 0 57 60 54 0 0 0 0 0 0 0 0 0 60 60 0 60 60 0 0 63 0 0 63 60 0 60 0 54 0 63 69 66 60 0 81 81 81 81 78 78 75 75 69 0 0 69 0 57 0 0 75 72 78 75 75 69 69 69 72 72 75 66 69 72 75 72 75 72 66 66 57 63 66 69 75 69 78 72 69 57 60 66 69 69 72 75 72 69 66 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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 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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="14">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.871 111.278 111.712 112.176 112.674 113.209 113.789 114.420 115.111 115.876 116.733 117.707 118.839 120.194
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 0 0 0 0 0 60 48 54 0 0 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 -0.390625 1.171875 -0.390625 -1.953125 0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.6 2.65 2.7 2.75 2.8 2.85 2.9
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 117.500 120.000 122.500 125.000 120.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 0 54 60 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 -1.953125 -2.734375 -0.390625 0.390625 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="175">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 95.0 100.0 105.0 105.7 110.0 111.136 115.0 116.573 120.0 122.009 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 284.835 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 1.858 2.376 2.557 2.56 2.482 2.434 2.434 2.434 2.513 2.56 2.673 2.847 3.012 3.172 3.332 3.493 3.656 3.823 3.995 4.173 4.357 4.549 4.749 4.958 5.178 5.408 5.65 5.903 6.168 6.445 6.733 7.03 7.333 7.638 7.941 8.234 8.511 8.763 8.982 9.161 9.293 9.374 9.4 9.4 9.389 9.359 9.311 9.246 9.166 9.073 8.967 8.85 8.723 8.588 8.445 8.296 8.141 7.982 7.819 7.653 7.485 7.315 7.144 6.973 6.803 6.632 6.463 6.295 6.129 5.964 5.802 5.642 5.484 5.33 5.178 5.029 4.883 4.74 4.6 4.463 4.33 4.199 4.072 3.948 3.828 3.71 3.596 3.484 3.376 3.271 3.168 3.069 2.972 2.879 2.788 2.699 2.614 2.53 2.45 2.371 2.296 2.222 2.151 2.082 2.015 1.95 1.887 1.826 1.767 1.71 1.655 1.601 1.549 1.499 1.45 1.403 1.358 1.313 1.271 1.229 1.189 1.151 1.113 1.077 1.042 1.008 0.975 0.943 0.912 0.883 0.854 0.826 0.799 0.773 0.748 0.723 0.7 0.677 0.655 0.633 0.613 0.593 0.573 0.554 0.536 0.519 0.502 0.485 0.47 0.454 0.439 0.425 0.411 0.398 0.385 0.372 0.36 0.348 0.337 0.326 0.315 0.305 0.295 0.285 0.276 0.267 0.258 0.25 0.241 0.233 0.226 0.218 0.211 0.204

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.56" PeakHeight="105.7" Num="3" Error="6.729">
-22.948 9.326 -2.078
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.56" EndFrequency="9.4" PeakHeight="284.835" Num="5" zHalfNm="223.522" Error="1.554">
-135.111 -31.439 1.058 2.367 0.299
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="16.309" Depth="0.126"/>
<TopsideChapman PeakHeight="284.835" PeakDensity="1096277.9" PeakScaleHeight="46.939" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
