<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 21:20:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: 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) 21:20:00</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">
FF202602801282120009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="9.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.256" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.549" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.800" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="310.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="310.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="545.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="1.010" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="458.400" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="332.063" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.414" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.050" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="180.240" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="44.294" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="92.507" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="176.910" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.120" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="2.950" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="133">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
310.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 325.000 325.000 325.000 330.000 328.333 326.667 325.000 330.000 330.000 330.000 330.000 332.500 335.000 337.500 340.000 341.000 342.000 343.000 344.000 345.000 346.250 347.500 348.750 350.000 350.000 350.000 355.000 355.000 355.000 360.000 361.667 363.333 365.000 366.875 368.750 370.625 372.500 374.375 376.250 378.125 380.000 380.000 385.000 387.500 390.000 390.000 390.000 392.222 394.444 396.667 398.889 401.111 403.333 405.556 407.778 410.000 415.000 416.667 418.333 420.000 422.500 425.000 435.000 435.000 435.000 440.000 445.000 450.000 450.000 455.000 455.000 460.000 465.000 470.000 472.500 475.000 480.000 480.000 480.000 485.000 490.000 495.000 500.000 500.000 505.000 510.000 515.000 520.000 520.000 525.000 530.000 535.000 540.000 540.000 545.000 555.000 560.000 570.000 575.000 575.000 585.000 590.000 595.000 605.000 610.000 617.722 626.084 635.170 645.077 655.923 667.848 681.020 695.646 711.981 730.344 751.137 774.876
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 63 66 66 69 69 66 69 0 0 0 0 63 0 51 0 0 66 54 0 0 60 66 72 72 69 51 0 0 69 0 0 0 48 69 0 66 0 69 0 0 69 0 0 72 0 0 69 0 66 0 60 0 0 0 69 69 66 57 66 69 72 0 0 69 0 66 0 69 0 63 63 0 0 63 54 60 60 66 63 66 63 60 66 63 66 66 0 63 0 66 63 66 75 78 81 75 75 75 57 66 63 63 66 66 66 63 63 63 60 63 66 57 66 72 75 75 72 66 66 72 72 63 63 63 60 57 54 0 0 51 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -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 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -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 -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 -1.953125 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 0.390625 -2.734375 -2.734375 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="36">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.05 2.1 2.15 2.2 2.25 2.3 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 120.000 110.000 105.000 105.000 105.000 105.000 105.000 103.333 101.667 100.000 105.000 110.000 110.000 110.000 110.000 115.000 115.000 115.000 110.000 115.000 113.333 111.667 110.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 54 60 0 0 69 69 0 0 0 57 72 63 60 60 60 60 57 63 66 60 0 0 63 0 0 66 63 0 0 63 0 0 0 0 57
</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 1.171875 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="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.26 95.0 100.0 105.0 110.0 115.0 120.0 125.0 126.736 130.0 135.0 140.0 143.472 145.0 150.0 155.0 160.0 160.208 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 458.4 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.672 0.875 0.978 1.01 0.993 0.94 0.847 0.802 0.802 0.802 0.802 0.802 0.821 0.883 0.945 1.007 1.01 1.104 1.192 1.277 1.363 1.452 1.545 1.645 1.751 1.866 1.992 2.129 2.28 2.445 2.624 2.818 3.025 3.241 3.463 3.689 3.915 4.139 4.36 4.577 4.789 4.997 5.2 5.399 5.593 5.784 5.97 6.153 6.333 6.509 6.682 6.852 7.019 7.184 7.345 7.503 7.658 7.809 7.958 8.103 8.244 8.38 8.513 8.64 8.762 8.878 8.987 9.089 9.183 9.268 9.343 9.408 9.461 9.503 9.531 9.547 9.55 9.55 9.545 9.536 9.521 9.502 9.478 9.449 9.416 9.379 9.339 9.294 9.246 9.195 9.141 9.083 9.023 8.96 8.895 8.827 8.757 8.685 8.612 8.536 8.459 8.38 8.3 8.219 8.137 8.054 7.969 7.884 7.799 7.712 7.626 7.538 7.451 7.363 7.275 7.187 7.099 7.011 6.923 6.835 6.747 6.66 6.573 6.486 6.399 6.313 6.228 6.143 6.058 5.974 5.891 5.808 5.726 5.644 5.564 5.484 5.404 5.326 5.248 5.171 5.094 5.019 4.944 4.87 4.797 4.725 4.653 4.583 4.513 4.444 4.376 4.309 4.242 4.177 4.112 4.048 3.985 3.922 3.861 3.8 3.741 3.682 3.623 3.566 3.51 3.454 3.399 3.345 3.291 3.238 3.187 3.135 3.085 3.035 2.986 2.938 2.891 2.844 2.798 2.753 2.708 2.664 2.621 2.578 2.536 2.494

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.01" PeakHeight="110.0" Num="3" Error="0.0">
-26.549 8.044 -1.235
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.01" EndFrequency="9.55" PeakHeight="458.4" Num="5" zHalfNm="332.063" Error="6.98">
-304.199 4.132 7.653 -11.454 5.676
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="50.208" Depth="0.208"/>
<TopsideChapman PeakHeight="458.4" PeakDensity="1131544.6" PeakScaleHeight="92.507" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
