<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 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" >
2026.01.28 (028) 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">
FF202602801281440009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="11.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.670" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.771" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="5.550" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="370.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="370.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="486.581" 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="3.359" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.345" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="343.252" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="263.466" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.147" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.500" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="100.220" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.414" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="59.323" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="158.970" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="105">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
370.000 370.000 370.000 370.000 370.000 370.000 370.000 375.000 378.333 381.667 385.000 385.000 383.333 381.667 380.000 378.333 376.667 375.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 386.667 388.333 390.000 391.000 392.000 393.000 394.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 405.000 405.000 407.500 410.000 410.000 410.000 412.500 415.000 415.000 420.000 420.000 422.500 425.000 425.000 425.000 425.000 425.000 430.000 432.500 435.000 435.000 435.000 440.000 440.000 442.500 445.000 445.000 450.000 450.000 450.000 455.000 455.000 455.000 460.000 460.000 460.000 465.000 465.000 467.500 470.000 472.500 475.000 475.000 480.000 483.119 486.581 490.448 494.795 499.717 505.335 511.810 519.352
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 54 54 60 60 60 54 45 0 0 0 0 0 0 0 0 0 57 60 60 63 66 66 60 54 63 63 57 60 60 60 57 66 66 66 63 60 57 54 0 0 63 0 0 0 0 63 66 66 63 63 63 63 60 57 45 48 0 57 51 54 57 51 54 45 48 54 54 57 54 57 45 54 57 54 51 57 48 54 57 51 57 60 57 60 57 48 51 57 48 51 48 51 0 45 51 0 45 0 45 0 48 45 48 0
</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 -1.953125 -1.953125 -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 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 2.734375 -0.390625 0.390625 -2.734375 -0.390625 0.390625 -2.734375 -0.390625 1.953125 0.390625 -1.953125 -0.390625 -0.390625 -0.390625 1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="22">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 115.000 115.000 115.000 115.000 115.000 115.000 110.000 112.500 115.000 115.000 115.000 115.000 115.000 115.000 110.000 111.667 113.333 115.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51 0 0 0 0 54 57 0 60 0 60 63 0 66 60 0 0 66 66 66 66
</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
</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 95.0 100.0 105.0 110.0 111.68 113.361 115.0 115.041 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 343.252 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.26 2.907 3.25 3.359 3.236 3.236 3.356 3.359 3.598 3.795 3.971 4.133 4.286 4.433 4.575 4.715 4.851 4.986 5.121 5.254 5.388 5.521 5.655 5.791 5.927 6.065 6.204 6.346 6.489 6.636 6.785 6.938 7.094 7.253 7.418 7.586 7.76 7.94 8.126 8.318 8.517 8.725 8.94 9.165 9.398 9.64 9.89 10.144 10.397 10.641 10.858 11.03 11.131 11.15 11.149 11.136 11.109 11.068 11.015 10.95 10.874 10.787 10.692 10.587 10.475 10.355 10.23 10.098 9.961 9.82 9.675 9.526 9.374 9.22 9.064 8.906 8.747 8.587 8.427 8.267 8.106 7.946 7.787 7.628 7.471 7.314 7.159 7.006 6.854 6.704 6.556 6.41 6.265 6.123 5.983 5.846 5.71 5.577 5.447 5.318 5.192 5.068 4.947 4.828 4.712 4.598 4.486 4.376 4.269 4.164 4.062 3.961 3.863 3.767 3.673 3.582 3.492 3.405 3.319 3.236 3.154 3.074 2.997 2.921 2.847 2.775 2.704 2.635 2.568 2.503 2.439 2.377 2.316 2.256 2.199 2.142 2.087 2.034 1.982 1.931 1.881 1.833 1.785 1.739 1.695 1.651 1.608 1.567 1.526 1.487 1.449 1.411 1.375 1.339 1.304 1.271 1.238 1.206 1.175 1.144 1.115 1.086 1.058 1.03 1.003 0.977 0.952 0.927 0.903 0.88 0.857 0.835 0.813 0.792 0.772 0.752 0.732 0.713 0.695 0.677 0.659 0.642 0.625 0.609 0.593 0.578

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.359" PeakHeight="110.0" Num="3" Error="0.0">
-30.478 13.118 -3.152
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.359" EndFrequency="11.15" PeakHeight="343.252" Num="5" zHalfNm="263.466" Error="5.629">
-173.647 -76.177 18.032 4.611 -1.03
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.041" Depth="0.123"/>
<TopsideChapman PeakHeight="343.252" PeakDensity="1542462.8" PeakScaleHeight="59.323" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
