<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 19:00:00.000"
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="1 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: F2x cusp not found, 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) 19:00:00</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">
FF202602801281900009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="10.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.284" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.870" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.800" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.910" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="250.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="250.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="102.305" Name="h`E" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="590.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.758" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="421.211" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="297.196" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.281" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="159.676" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="52.397" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="87.475" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="213.040" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.160" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="125">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
250.000 255.000 260.000 265.000 270.000 275.000 280.000 280.000 285.000 290.000 295.000 300.000 305.000 305.000 310.000 315.000 317.500 320.000 321.667 323.333 325.000 330.000 335.000 340.000 342.857 345.714 348.571 351.429 354.286 357.143 360.000 360.000 365.000 370.000 375.000 375.000 380.000 381.667 383.333 385.000 390.000 395.000 395.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 425.000 425.000 430.000 430.000 435.000 435.000 440.000 445.000 445.000 450.000 450.000 455.000 460.000 460.000 465.000 465.000 470.000 475.000 475.000 480.000 480.000 480.000 485.000 485.000 490.000 495.000 500.000 500.000 505.000 505.000 515.000 515.000 520.000 520.000 525.000 530.000 530.000 530.000 535.000 535.000 535.000 540.000 540.000 540.000 545.000 545.000 550.000 550.000 550.000 555.000 555.000 560.000 562.500 565.000 567.500 570.000 575.000 577.500 580.000 585.000 590.000 590.000 595.000 600.000 605.000 615.000 620.000 630.000 635.000 640.000 651.250 662.329 674.860 689.151
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 54 54 54 54 57 54 51 0 54 0 51 54 51 48 0 51 0 0 48 54 54 51 0 0 0 0 54 0 57 57 57 0 45 54 48 0 0 54 54 48 57 54 45 57 51 57 54 57 0 54 60 54 60 57 63 60 54 63 57 63 63 57 66 63 69 66 57 66 60 66 69 69 69 69 66 63 69 66 66 54 63 57 66 63 57 63 66 66 66 66 69 69 66 66 66 66 66 63 66 66 63 0 60 51 60 57 0 57 54 54 54 54 54 54 54 51 48 51 48 0 0 48 45
</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 -1.953125 -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 -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 -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 2.734375 1.171875 -0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="3">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.8 2.85 2.9
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
102.305 104.614 108.407
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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" >
89.561 90.0 95.0 100.0 105.0 110.0 114.328 115.0 118.656 120.0 122.984 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 421.211 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.236 1.956 2.519 2.815 2.91 2.781 2.781 2.781 2.821 2.91 2.949 3.05 3.156 3.267 3.383 3.504 3.628 3.756 3.886 4.019 4.153 4.288 4.424 4.561 4.697 4.834 4.97 5.105 5.24 5.374 5.508 5.641 5.774 5.905 6.037 6.167 6.298 6.428 6.557 6.687 6.816 6.945 7.074 7.203 7.332 7.462 7.591 7.721 7.852 7.982 8.114 8.246 8.378 8.511 8.645 8.78 8.916 9.052 9.19 9.328 9.466 9.604 9.742 9.878 10.01 10.136 10.251 10.348 10.417 10.449 10.45 10.448 10.44 10.425 10.405 10.379 10.347 10.31 10.268 10.222 10.17 10.115 10.055 9.992 9.924 9.854 9.78 9.704 9.624 9.542 9.458 9.371 9.283 9.192 9.1 9.006 8.911 8.815 8.717 8.619 8.52 8.42 8.319 8.218 8.117 8.015 7.913 7.811 7.709 7.607 7.505 7.404 7.303 7.202 7.101 7.001 6.902 6.803 6.704 6.607 6.51 6.413 6.318 6.223 6.129 6.036 5.944 5.853 5.763 5.673 5.585 5.497 5.411 5.325 5.241 5.157 5.075 4.993 4.913 4.833 4.755 4.678 4.601 4.526 4.452 4.378 4.306 4.235 4.164 4.095 4.027 3.96 3.893 3.828 3.764 3.7 3.638 3.576 3.516 3.456 3.398 3.34 3.283 3.227 3.172 3.118 3.064 3.012 2.96 2.909 2.859 2.81 2.762 2.714 2.667 2.621 2.576 2.531 2.487 2.444 2.402 2.36 2.319 2.279 2.239 2.2 2.162

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.91" PeakHeight="110.0" Num="3" Error="0.0">
-30.118 12.59 -2.911
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.91" EndFrequency="10.45" PeakHeight="421.211" Num="5" zHalfNm="297.196" Error="3.172">
-244.569 -77.787 33.252 -9.799 0.676
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="12.984" Depth="0.129"/>
<TopsideChapman PeakHeight="421.211" PeakDensity="1354869.8" PeakScaleHeight="87.475" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
