<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-28 -087 18:30:00.000"
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 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" >
2026.03.28 (087) 18:30:00</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">
FF202608703281830009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="13.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.381" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.078" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="8.650" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.900" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.060" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="350.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="350.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="110.909" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="118.333" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="100.473" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="10.235" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="560.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.901" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="407.395" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="296.007" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.515" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.500" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="150.825" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="76.718" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="82.461" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="196.510" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.170" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="6.550" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="131">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
350.000 350.000 350.000 350.000 355.000 355.000 357.500 360.000 365.000 365.000 365.000 365.000 368.333 371.667 375.000 377.500 380.000 380.000 382.500 385.000 385.000 385.000 387.500 390.000 390.000 395.000 395.000 400.000 400.000 402.500 405.000 405.000 405.000 410.000 415.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 425.000 430.000 430.000 435.000 435.000 435.000 435.000 440.000 445.000 445.000 445.000 445.000 445.000 450.000 450.000 450.000 455.000 455.000 455.000 455.000 455.000 460.000 460.000 460.000 460.000 460.000 465.000 465.000 465.000 465.000 467.500 470.000 470.000 470.000 475.000 477.500 480.000 480.000 480.000 480.000 480.000 482.500 485.000 487.500 490.000 490.000 495.000 496.000 497.000 498.000 499.000 500.000 500.000 505.000 510.000 510.000 510.000 515.000 515.000 515.000 515.000 520.000 520.000 525.000 527.500 530.000 535.000 535.000 540.000 542.500 545.000 550.000 550.000 555.000 560.000 560.000 565.000 570.000 575.000 580.000 585.000 595.000 600.000 609.180 619.986 632.890 648.571 668.033 692.830
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 66 69 69 72 69 0 75 66 69 75 72 0 0 69 0 60 75 0 69 0 78 72 78 78 78 84 75 75 0 75 75 75 72 63 69 69 72 66 66 60 69 69 69 69 63 69 75 69 0 63 69 72 72 69 69 75 69 63 66 66 66 63 63 69 69 66 66 69 69 66 66 0 66 0 57 60 0 54 0 0 66 63 0 0 0 57 63 51 0 0 0 0 54 57 0 45 0 57 45 0 54 54 57 60 60 0 60 51 57 51 0 54 48 54 51 48 54 48 51 54 54 51 48 54 45 42 0 0 0 0
</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="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.9 2.95 3.0 3.05
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.909 112.591 114.891 118.673
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -2.734375 1.171875 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="104">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
135.000 130.000 125.000 125.000 120.000 120.000 120.000 120.000 117.500 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 120.000 125.000 125.000 115.000 120.000 120.000 120.000 121.667 123.333 125.000 125.000 117.500 110.000 110.000 112.500 115.000 115.000 115.000 115.000 120.000 120.000 120.000 120.000 120.000 115.000 115.000 115.000 116.250 117.500 118.750 120.000 120.000 120.000 117.500 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 117.500 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 54 51 60 51 0 54 0 57 60 54 0 63 72 69 72 69 57 0 69 63 60 63 0 45 51 48 0 66 72 0 75 72 69 72 57 57 0 54 63 75 72 60 0 45 0 57 60 57 0 63 0 0 0 78 72 69 72 66 0 0 0 69 57 0 60 45 0 0 0 0 0 0 0 48 0 0 0 0 51 54 54 0 0 51 51 0 63 66 63 0 60 0 60 57 0 0 0 0 0 0 48 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</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" >
90.0 95.0 100.0 100.473 104.137 105.0 107.801 110.0 111.465 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 407.395 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.586 3.057 3.06 2.931 2.931 2.931 3.008 3.06 3.189 3.372 3.553 3.73 3.904 4.074 4.241 4.406 4.568 4.728 4.887 5.044 5.201 5.357 5.512 5.668 5.823 5.979 6.135 6.292 6.449 6.608 6.768 6.929 7.091 7.255 7.42 7.587 7.756 7.927 8.101 8.276 8.454 8.634 8.816 9.002 9.19 9.38 9.574 9.77 9.968 10.17 10.373 10.579 10.787 10.995 11.205 11.414 11.621 11.826 12.025 12.217 12.399 12.566 12.715 12.842 12.942 13.011 13.046 13.05 13.049 13.039 13.021 12.995 12.96 12.917 12.867 12.811 12.747 12.677 12.602 12.521 12.434 12.343 12.247 12.146 12.042 11.934 11.823 11.708 11.591 11.471 11.348 11.224 11.098 10.97 10.84 10.709 10.577 10.444 10.311 10.177 10.042 9.907 9.772 9.637 9.502 9.367 9.233 9.099 8.965 8.832 8.7 8.568 8.437 8.308 8.179 8.051 7.924 7.798 7.674 7.55 7.428 7.307 7.188 7.069 6.952 6.837 6.723 6.61 6.498 6.388 6.28 6.173 6.067 5.963 5.86 5.759 5.659 5.56 5.463 5.367 5.273 5.18 5.089 4.999 4.91 4.823 4.737 4.653 4.569 4.488 4.407 4.328 4.25 4.173 4.098 4.024 3.951 3.879 3.809 3.74 3.672 3.605 3.539 3.474 3.411 3.348 3.287 3.227 3.168 3.11 3.052 2.996 2.941 2.887 2.834 2.781 2.73 2.68 2.63 2.581 2.534 2.487 2.441 2.395 2.351 2.307 2.265

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.06" PeakHeight="100.473" Num="3" Error="2.854">
-15.478 6.538 -1.533
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.06" EndFrequency="13.05" PeakHeight="407.395" Num="5" zHalfNm="296.007" Error="2.454">
-252.358 -66.93 24.455 0.017 -1.114
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="10.992" Depth="0.129"/>
<TopsideChapman PeakHeight="407.395" PeakDensity="2112934.2" PeakScaleHeight="82.461" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
