<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-29 -088 17:30:00.000"
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" >
2026.03.29 (088) 17:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202608803291730009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="14.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.780" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="40.169" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="8.350" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="8.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.850" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.910" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="14.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="345.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="345.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="104.421" Name="h`E" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="13.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="430.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.158" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="8.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="8.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.251" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="334.157" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="248.240" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.257" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.300" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="119.327" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="71.849" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="63.938" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="140.820" 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="122">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 13.7 13.75 13.8 13.85 13.9 13.95 14.0 14.05 14.1 14.15 14.2 14.25 14.3 14.35 14.4 14.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.714 346.429 347.143 347.857 348.571 349.286 350.000 350.714 351.429 352.143 352.857 353.571 354.286 355.000 355.714 356.429 357.143 357.857 358.571 359.286 360.000 360.714 361.429 362.143 362.857 363.571 364.286 365.000 365.714 366.429 367.143 367.857 368.571 369.286 370.000 370.714 371.429 372.143 372.857 373.571 374.286 375.000 375.000 375.000 375.000 377.500 380.000 380.000 380.000 380.000 380.000 380.000 385.000 385.000 386.000 387.000 388.000 389.000 390.000 390.000 390.000 395.000 397.500 400.000 395.000 397.500 400.000 402.500 405.000 410.000 411.667 413.333 415.000 415.000 415.000 417.500 420.000 425.000 430.000 430.000 430.000 435.000 440.000 442.500 445.000 448.810 453.038 457.759 463.064 469.068 475.919 483.810 492.996 503.827 516.787 532.571 552.215 577.335
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 66 69 66 69 69 69 69 69 66 63 66 57 63 54 54 63 60 48 48 0 48 48 48 45 0 66 66 63 60 60 66 63 57 66 0 66 0 66 0 63 0 0 57 0 0 60 57 0 0 0 48 48 51 54 0 0 42 45 0 0 0 0 0 0 48 51 0 60 0 48 54 57 0 63 63 57 60 0 0 0 0 63 63 63 60 0 54 60 0 60 0 60 54 0 0 57 60 57 0 57 60 54 60 54 57 60 0 57 57 57 57 57 57 54 54 51 51 54 0 48 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.85 2.9
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
104.421 110.111
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="82">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 120.000 117.500 115.000 114.861 114.722 114.583 114.444 114.306 114.167 114.028 113.889 113.750 113.611 113.472 113.333 113.194 113.056 112.917 112.778 112.639 112.500 112.361 112.222 112.083 111.944 111.806 111.667 111.528 111.389 111.250 111.111 110.972 110.833 110.694 110.556 110.417 110.278 110.139 110.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 115.000 115.000 115.000 115.000 120.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 0 51 0 0 0 0 0 45 0 0 51 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 45 0 0 0 0 0 0 0 48 60 0 57 63 63 63 66 66 66 66 69 57 57 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 69 0 0 69 78 78 75 75 57 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 -1.953125 -1.953125 -0.390625 1.953125 -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 1.171875 -0.390625 -2.734375 -2.734375 -0.390625 -0.390625 -0.390625 1.171875 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
</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" >
89.561 90.0 95.0 100.0 105.0 110.0 112.521 115.0 115.043 117.564 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 334.157 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.236 1.956 2.519 2.815 2.91 2.798 2.798 2.798 2.91 3.007 3.229 3.481 3.755 4.041 4.331 4.62 4.907 5.19 5.47 5.747 6.022 6.297 6.571 6.845 7.12 7.397 7.675 7.956 8.24 8.527 8.817 9.111 9.409 9.711 10.017 10.327 10.64 10.957 11.275 11.595 11.914 12.231 12.543 12.847 13.14 13.416 13.671 13.9 14.095 14.252 14.366 14.433 14.45 14.45 14.438 14.411 14.368 14.31 14.239 14.155 14.059 13.953 13.835 13.709 13.573 13.43 13.279 13.122 12.959 12.791 12.618 12.44 12.26 12.076 11.89 11.702 11.512 11.321 11.128 10.936 10.743 10.55 10.357 10.165 9.974 9.784 9.595 9.408 9.222 9.038 8.856 8.676 8.498 8.322 8.148 7.977 7.808 7.641 7.477 7.316 7.157 7.001 6.848 6.697 6.549 6.403 6.26 6.12 5.982 5.847 5.715 5.585 5.458 5.333 5.211 5.091 4.974 4.859 4.747 4.637 4.529 4.424 4.32 4.22 4.121 4.024 3.93 3.838 3.747 3.659 3.573 3.489 3.406 3.325 3.247 3.17 3.095 3.021 2.949 2.879 2.811 2.744 2.678 2.615 2.552 2.491 2.432 2.374 2.317 2.261 2.207 2.154 2.103 2.053 2.003 1.955 1.908 1.863 1.818 1.774 1.732 1.69 1.649 1.61 1.571 1.533 1.497 1.461 1.425 1.391 1.358 1.325 1.293 1.262 1.232 1.202 1.173 1.145 1.117 1.09 1.064 1.038 1.013 0.989 0.965 0.942 0.919

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.91" PeakHeight="110.0" Num="3" Error="0.0">
-30.118 12.59 -2.911
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.91" EndFrequency="14.45" PeakHeight="334.157" Num="5" zHalfNm="248.24" Error="3.625">
-197.161 -31.347 14.592 -1.27 -1.407
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.564" Depth="0.112"/>
<TopsideChapman PeakHeight="334.157" PeakDensity="2590601.8" PeakScaleHeight="63.938" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
