<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 21:00:00.000"
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 F2o 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" >
2026.01.28 (028) 21:00:00</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">
FF202602801282100009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="9.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.350" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.326" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="5.450" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="290.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="290.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="525.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.431" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="415.207" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="306.210" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.590" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.350" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="152.913" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="37.701" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="77.933" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="163.830" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.660" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="3.350" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="124">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
290.000 290.000 295.000 295.000 295.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 305.000 306.667 308.333 310.000 311.667 313.333 315.000 316.667 318.333 320.000 321.667 323.333 325.000 326.667 328.333 330.000 331.667 333.333 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 345.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 357.500 360.000 365.000 365.000 365.000 368.333 371.667 375.000 375.000 380.000 385.000 385.000 385.000 387.500 390.000 395.000 395.000 395.000 400.000 400.000 405.000 410.000 410.000 410.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 435.000 438.333 441.667 445.000 450.000 450.000 455.000 455.000 460.000 470.000 475.000 475.000 480.000 480.000 480.000 485.000 490.000 495.000 495.000 505.000 505.000 510.000 515.000 520.000 520.000 525.000 525.000 530.000 535.000 540.000 545.000 550.000 555.000 565.000 570.000 575.000 585.000 590.000 595.895 602.407 609.639 617.716 626.797 637.081 648.824 662.359
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 57 63 66 66 69 69 69 63 60 63 63 60 54 0 0 0 0 0 0 0 0 0 0 0 51 0 0 0 0 0 60 0 0 0 60 0 0 0 63 60 63 63 63 54 66 0 0 66 66 69 0 0 0 66 66 0 54 60 66 0 66 57 66 66 66 66 66 57 66 66 66 63 69 66 66 66 63 66 0 0 66 66 63 66 66 63 57 54 66 63 66 66 63 66 66 66 60 66 66 60 54 63 60 63 60 60 60 60 60 60 60 63 63 60 63 63 63 60 60 57 57 57 54
</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 -0.390625 -0.390625 -1.171875 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="63">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.35 2.4 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 110.000 105.000 110.000 109.167 108.333 107.500 106.667 105.833 105.000 100.000 100.000 103.333 106.667 110.000 115.000 112.500 110.000 105.000 105.000 107.500 110.000 110.000 110.000 110.238 110.476 110.714 110.952 111.190 111.429 111.667 111.905 112.143 112.381 112.619 112.857 113.095 113.333 113.571 113.810 114.048 114.286 114.524 114.762 115.000 117.500 120.000 122.500 125.000 127.500 130.000 130.000 130.000 130.000 130.000 125.000 122.857 120.714 118.571 116.429 114.286 112.143 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 66 60 0 0 0 0 0 78 81 63 0 0 63 57 0 57 0 72 0 60 0 63 0 0 0 0 0 60 0 0 0 57 0 0 48 0 0 60 0 0 54 0 60 0 0 0 0 0 0 51 0 0 54 48 0 0 0 0 0 0 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 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 -1.171875 0.390625 0.390625 0.390625 0.390625 1.171875 -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 -2.734375 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" >
89.967 90.0 95.0 100.0 105.0 110.0 115.0 120.0 121.781 125.0 130.0 133.563 135.0 140.0 145.0 145.344 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 415.207 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.203 0.956 1.24 1.385 1.431 1.405 1.324 1.281 1.281 1.281 1.281 1.299 1.363 1.427 1.431 1.546 1.656 1.761 1.866 1.974 2.087 2.205 2.331 2.466 2.61 2.765 2.93 3.107 3.293 3.487 3.687 3.891 4.096 4.3 4.503 4.702 4.898 5.091 5.28 5.465 5.647 5.826 6.001 6.174 6.344 6.512 6.678 6.841 7.003 7.164 7.322 7.48 7.635 7.79 7.942 8.094 8.243 8.39 8.535 8.676 8.814 8.946 9.07 9.186 9.288 9.375 9.442 9.485 9.5 9.5 9.497 9.486 9.468 9.443 9.412 9.375 9.333 9.284 9.231 9.173 9.11 9.043 8.972 8.897 8.819 8.738 8.654 8.567 8.477 8.386 8.292 8.197 8.1 8.001 7.902 7.801 7.7 7.597 7.494 7.391 7.287 7.183 7.079 6.975 6.871 6.767 6.664 6.561 6.458 6.356 6.255 6.154 6.054 5.955 5.856 5.758 5.662 5.566 5.471 5.377 5.285 5.193 5.102 5.013 4.924 4.837 4.751 4.666 4.582 4.5 4.418 4.338 4.259 4.181 4.104 4.028 3.954 3.881 3.809 3.738 3.668 3.599 3.531 3.465 3.4 3.335 3.272 3.21 3.149 3.089 3.03 2.972 2.916 2.86 2.805 2.751 2.698 2.646 2.595 2.545 2.496 2.448 2.4 2.354 2.308 2.263 2.219 2.176 2.134 2.092 2.051 2.011 1.972 1.933 1.896 1.858 1.822 1.786 1.751 1.717 1.683 1.65 1.618 1.586 1.555 1.524 1.494

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.431" PeakHeight="110.0" Num="3" Error="0.0">
-27.958 9.678 -1.753
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.431" EndFrequency="9.5" PeakHeight="415.207" Num="5" zHalfNm="306.21" Error="6.183">
-252.023 -31.601 22.715 -14.696 5.742
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="35.344" Depth="0.15"/>
<TopsideChapman PeakHeight="415.207" PeakDensity="1119727.0" PeakScaleHeight="77.933" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
