<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-28 -087 20:30:00.000"
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="2 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x cusp, One of F2 cusps was derived from the other</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) 20:30:00</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">
FF202608703282030009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="11.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.545" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.635" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.450" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="8.050" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="330.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="330.000" Name="h`F2" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="522.470" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.788" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="377.556" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="294.143" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.630" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.450" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="117.027" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.591" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="59.702" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="141.230" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.250" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="6.050" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="105">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
330.000 330.000 330.000 335.000 335.000 335.000 335.000 340.000 340.000 342.045 344.091 346.136 348.182 350.227 352.273 354.318 356.364 358.409 360.455 362.500 364.545 366.591 368.636 370.682 372.727 374.773 376.818 378.864 380.909 382.955 385.000 385.000 385.000 385.000 390.000 390.000 392.500 395.000 395.000 400.000 400.000 400.000 405.000 410.000 410.000 410.000 415.000 415.000 415.000 420.000 422.500 425.000 425.000 427.500 430.000 430.000 430.000 432.500 435.000 437.500 440.000 440.000 440.000 442.500 445.000 447.500 450.000 451.250 452.500 453.750 455.000 457.500 460.000 460.000 465.000 465.000 467.500 470.000 470.000 475.000 475.000 475.000 477.500 480.000 490.000 490.000 490.000 490.000 492.500 495.000 505.000 510.000 510.000 515.000 515.000 517.201 519.673 522.470 525.659 529.329 533.599 538.629 544.640 551.950 561.034
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 69 69 63 0 66 63 69 72 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 57 63 69 69 60 57 0 60 66 60 66 66 66 54 66 66 57 63 66 63 0 60 69 0 63 66 72 63 69 54 63 0 72 0 69 0 66 0 0 0 63 0 60 60 60 66 0 63 63 63 60 54 51 57 51 54 48 57 48 51 51 45 51 51 51 51 48 0 48 45 45 48 48 51 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="Es" Polarization="O" Num="113">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 110.000 112.500 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 120.000 120.000 120.000 120.000 115.000 116.000 117.000 118.000 119.000 120.000 125.000 124.667 124.333 124.000 123.667 123.333 123.000 122.667 122.333 122.000 121.667 121.333 121.000 120.667 120.333 120.000 115.000 114.375 113.750 113.125 112.500 111.875 111.250 110.625 110.000 111.667 113.333 115.000 110.000 112.500 115.000 115.833 116.667 117.500 118.333 119.167 120.000 120.000 117.500 115.000 115.000 115.000 120.000 120.000 120.000 118.750 117.500 116.250 115.000 112.500 110.000 110.000 111.667 113.333 115.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 115.000 115.000 115.000 115.000 120.000 120.000 115.000 115.000 115.000 115.000 115.000 120.000 120.000 120.000 115.000 115.000 115.000 115.000 125.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 69 0 72 75 72 0 0 0 0 72 0 51 0 0 60 72 0 0 0 0 60 63 0 0 0 0 0 0 0 57 0 0 0 66 0 60 69 81 0 0 0 0 0 0 0 78 0 0 72 75 0 75 0 0 48 0 0 66 63 0 78 78 72 69 66 66 0 0 0 75 66 69 72 0 57 72 54 69 48 66 0 69 0 66 72 72 78 78 75 75 72 72 69 75 72 69 69 69 69 0 72 72 57 72 69 66 69 69 66 0 72 66
</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" >
89.826 90.0 95.0 100.0 105.0 110.0 115.0 119.422 120.0 125.0 128.844 130.0 135.0 138.266 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 377.556 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.215 1.197 1.549 1.73 1.788 1.75 1.651 1.651 1.651 1.651 1.668 1.741 1.788 1.841 1.998 2.16 2.329 2.505 2.688 2.876 3.07 3.269 3.47 3.674 3.879 4.086 4.292 4.499 4.705 4.911 5.117 5.322 5.526 5.731 5.935 6.138 6.342 6.546 6.75 6.955 7.16 7.366 7.573 7.782 7.991 8.202 8.414 8.628 8.845 9.063 9.283 9.505 9.729 9.954 10.179 10.402 10.62 10.827 11.011 11.156 11.239 11.25 11.248 11.233 11.204 11.162 11.107 11.041 10.963 10.876 10.779 10.673 10.56 10.44 10.314 10.181 10.044 9.902 9.756 9.607 9.455 9.3 9.144 8.985 8.826 8.666 8.505 8.344 8.184 8.023 7.863 7.704 7.546 7.389 7.234 7.08 6.928 6.777 6.628 6.482 6.337 6.194 6.054 5.915 5.779 5.646 5.514 5.385 5.258 5.134 5.012 4.892 4.775 4.66 4.548 4.437 4.329 4.224 4.12 4.019 3.92 3.824 3.729 3.637 3.546 3.458 3.372 3.288 3.205 3.125 3.047 2.97 2.895 2.822 2.751 2.681 2.614 2.547 2.483 2.42 2.358 2.298 2.24 2.183 2.127 2.073 2.02 1.969 1.918 1.869 1.821 1.775 1.729 1.685 1.642 1.6 1.559 1.519 1.48 1.442 1.405 1.369 1.334 1.299 1.266 1.233 1.202 1.171 1.141 1.111 1.083 1.055 1.028 1.001 0.975 0.95 0.926 0.902 0.879 0.856 0.834 0.812 0.791 0.771 0.751 0.732 0.713

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.788" PeakHeight="110.0" Num="3" Error="0.0">
-28.713 10.646 -2.107
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.788" EndFrequency="11.25" PeakHeight="377.556" Num="5" zHalfNm="294.143" Error="2.452">
-207.722 -54.391 31.59 -10.637 1.87
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="28.266" Depth="0.137"/>
<TopsideChapman PeakHeight="377.556" PeakDensity="1570254.4" PeakScaleHeight="59.702" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
