<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-27 -027 16:40:00.000"
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="2 2 0 1 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" >
2026.01.27 (027) 16:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" 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">
FF202602701271640009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="9.375" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="6.122" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.304" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.540" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="240.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="387.500" Name="h`F2" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="505.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.025" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.281" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.309" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="409.206" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="229.929" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="250.265" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.856" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="183.600" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="89.862" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="54.026" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="116.253" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="245.460" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.590" Name="B1" QL="/" DL="/" />
<URSI ID="D2" Val="0.100" Name="D1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="65">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
387.500 390.000 395.000 397.500 400.000 400.000 403.333 406.667 410.000 410.000 410.000 412.500 415.000 420.000 420.000 425.000 425.000 430.000 435.000 437.500 440.000 445.000 450.000 450.000 455.000 455.000 460.000 462.500 465.000 470.000 475.000 480.000 485.000 490.000 490.000 495.000 500.000 500.000 505.000 515.000 520.000 525.000 535.000 540.000 545.000 555.000 560.000 570.000 580.000 590.000 600.000 605.000 615.000 625.000 635.000 645.000 655.000 665.000 678.333 691.667 708.243 727.066 748.623 773.559 802.734
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 57 54 0 51 57 0 0 0 51 51 0 51 54 57 60 57 60 57 48 57 0 48 57 51 60 54 0 60 57 54 54 51 48 57 60 57 57 57 57 57 54 57 57 54 57 54 57 57 60 60 57 57 57 54 54 54 54 0 45 51 51 51 51 48
</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 -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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="24">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 250.000 260.000 270.000 280.000 290.000 295.000 305.000 310.000 320.000 325.000 335.000 345.000 345.000 350.000 360.000 365.000 370.000 375.000 375.000 375.000 377.500 380.000 385.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 51 0 0 0 57 51 54 48 45 48 54 48 51 51 57 54 54 51 60 0 0 51 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 -0.390625 -0.390625 -1.953125 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="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.501 90.0 95.0 100.0 105.0 110.0 112.002 114.005 115.0 116.007 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 229.929 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 409.206 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.207 2.84 3.174 3.281 3.159 3.159 3.22 3.281 3.423 3.573 3.719 3.868 4.025 4.189 4.354 4.514 4.665 4.805 4.933 5.053 5.164 5.269 5.37 5.466 5.56 5.652 5.744 5.838 5.935 6.038 6.122 6.124 6.27 6.394 6.51 6.623 6.736 6.851 6.969 7.09 7.214 7.34 7.467 7.592 7.715 7.833 7.947 8.054 8.156 8.253 8.345 8.432 8.516 8.595 8.672 8.746 8.817 8.886 8.953 9.018 9.08 9.141 9.199 9.253 9.301 9.341 9.368 9.375 9.375 9.373 9.367 9.359 9.347 9.332 9.314 9.294 9.271 9.245 9.216 9.186 9.152 9.117 9.08 9.04 8.998 8.955 8.909 8.862 8.813 8.763 8.711 8.658 8.603 8.548 8.491 8.432 8.373 8.313 8.252 8.19 8.127 8.063 7.999 7.934 7.869 7.803 7.736 7.669 7.602 7.534 7.466 7.398 7.33 7.261 7.193 7.124 7.055 6.986 6.917 6.849 6.78 6.711 6.643 6.574 6.506 6.438 6.37 6.303 6.235 6.168 6.102 6.035 5.969 5.903 5.838 5.773 5.708 5.644 5.58 5.517 5.454 5.391 5.329 5.268 5.206 5.146 5.085 5.026 4.966 4.908 4.849 4.792 4.734 4.678 4.621 4.566 4.51 4.456 4.402 4.348 4.295 4.242 4.19 4.138 4.087 4.037 3.987 3.937 3.888 3.84 3.792 3.745 3.698 3.651 3.605 3.56 3.515 3.471 3.427 3.383 3.34 3.298 3.256 3.214 3.173 3.133 3.093

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.281" PeakHeight="110.0" Num="3" Error="0.0">
-30.42 13.033 -3.112
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.281" EndFrequency="6.122" PeakHeight="229.929" Num="5" Error="0.0">
-90.711 -36.385 19.538 -9.191 2.827
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="6.122" EndFrequency="9.375" PeakHeight="409.206" Num="5" zHalfNm="250.265" Error="3.926">
-157.03 -32.78 15.854 -8.698 3.377
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.007" Depth="0.122"/>
<TopsideChapman PeakHeight="409.206" PeakDensity="1090454.4" PeakScaleHeight="116.253" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
