<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-27 -027 14:40:00.000"
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 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" >
2026.01.27 (027) 14:40:00</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">
FF202602701271440009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.415" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.133" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="295.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="295.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="495.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.357" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.345" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="392.788" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="228.790" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.147" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="216.371" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="48.229" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="120.446" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="244.740" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.810" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="68">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
295.000 300.000 305.000 312.000 319.000 326.000 333.000 340.000 345.000 350.000 355.000 360.000 365.000 375.000 380.000 382.500 385.000 385.000 385.000 390.000 395.000 397.500 400.000 400.000 405.000 405.000 410.000 412.500 415.000 415.000 420.000 425.000 425.000 427.500 430.000 435.000 440.000 445.000 450.000 453.750 457.500 461.250 465.000 470.000 475.000 480.000 485.000 495.000 495.000 505.000 510.000 520.000 530.000 535.000 545.000 555.000 565.000 576.303 588.787 602.649 618.131 635.532 655.235 677.727 703.647 733.843 769.468 812.131
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 48 0 0 0 0 48 48 0 48 48 54 51 48 0 48 0 54 57 54 0 51 54 48 54 0 0 54 54 0 57 60 0 54 54 51 48 45 0 0 0 51 51 0 54 51 54 60 57 60 60 63 57 54 57 57 60 60 57 48 0 0 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-2.734375 0.390625 0.390625 -1.171875 0.390625 1.953125 -1.171875 -0.390625 -0.390625 -1.171875 -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 1.171875 -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 -0.390625 -0.390625 1.171875 1.171875 -2.734375 -2.734375 -1.171875 1.171875
</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" >
89.488 90.0 95.0 100.0 105.0 110.0 111.686 113.371 115.0 115.057 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 392.788 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.258 2.905 3.248 3.357 3.234 3.234 3.353 3.357 3.478 3.599 3.717 3.836 3.955 4.075 4.196 4.318 4.442 4.567 4.693 4.82 4.948 5.076 5.205 5.334 5.463 5.591 5.718 5.845 5.97 6.094 6.217 6.338 6.457 6.575 6.691 6.805 6.917 7.027 7.135 7.241 7.344 7.446 7.545 7.641 7.735 7.827 7.915 8.001 8.083 8.162 8.238 8.31 8.377 8.44 8.498 8.551 8.599 8.64 8.675 8.704 8.726 8.741 8.749 8.75 8.75 8.747 8.741 8.733 8.722 8.708 8.692 8.674 8.653 8.63 8.604 8.577 8.547 8.516 8.482 8.447 8.41 8.371 8.331 8.289 8.246 8.201 8.155 8.107 8.059 8.009 7.959 7.907 7.854 7.8 7.746 7.691 7.635 7.578 7.521 7.463 7.404 7.345 7.286 7.226 7.166 7.105 7.044 6.983 6.922 6.86 6.799 6.737 6.675 6.613 6.551 6.489 6.427 6.365 6.303 6.241 6.18 6.118 6.057 5.995 5.934 5.873 5.813 5.752 5.692 5.633 5.573 5.514 5.455 5.396 5.338 5.28 5.222 5.165 5.108 5.052 4.996 4.94 4.885 4.83 4.775 4.721 4.668 4.615 4.562 4.509 4.457 4.406 4.355 4.304 4.254 4.205 4.155 4.107 4.058 4.01 3.963 3.916 3.869 3.823 3.778 3.733 3.688 3.644 3.6 3.556 3.514 3.471 3.429 3.387 3.346 3.306 3.265 3.225 3.186 3.147 3.108 3.07 3.033 2.995 2.958 2.922

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.357" PeakHeight="110.0" Num="3" Error="0.0">
-30.477 13.116 -3.151
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.357" EndFrequency="8.75" PeakHeight="392.788" Num="5" zHalfNm="228.79" Error="5.383">
-267.971 -15.706 8.224 -3.475 1.197
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.057" Depth="0.123"/>
<TopsideChapman PeakHeight="392.788" PeakDensity="949906.94" PeakScaleHeight="120.446" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
