<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 23:00:00.000"
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 55 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 20% PACIFIC flags: Moderate F-spread, F2o cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2, Trace overlaps while constructing baseline</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) 23:00:00</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">
FF202602801282300009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="6.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.498" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="16.738" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.200" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="415.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="415.000" 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="0.750" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="487.325" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="452.487" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="395.026" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.308" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="86.882" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="10.612" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="42.751" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="100.540" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.240" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="74">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
415.000 415.000 417.500 420.000 427.500 435.000 435.000 437.000 439.000 441.000 443.000 445.000 447.000 449.000 451.000 453.000 455.000 460.000 460.000 460.000 460.000 460.000 460.000 460.000 458.333 456.667 455.000 470.000 475.000 472.500 470.000 470.000 472.500 475.000 475.000 475.000 475.000 475.526 476.053 476.579 477.105 477.632 478.158 478.684 479.211 479.737 480.263 480.789 481.316 481.842 482.368 520.000 535.000 505.000 475.000 475.000 465.000 468.829 472.941 477.368 482.148 487.325 492.950 499.085 505.803 513.189 521.350 530.413 540.538 551.921 564.815 579.540 596.517 616.304
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 51 0 63 0 60 57 57 0 60 60 63 0 0 51 54 0 54 51 0 63 66 0 0 57 57 54 0 54 54 54 54 54 0 54 0 0 0 51 54 54 0 54 0 0 48 0 0 0 54 51 51 54 51 57 0 0 0 54 0 54 0 0 0 0 51 0 0 0 51 0 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 1.171875 1.953125 -1.171875 1.171875 -1.171875 1.171875 -0.390625 -1.171875 -0.390625 1.171875 -1.171875 -0.390625 -0.390625 -1.171875 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 1.171875 -1.171875 1.171875 1.171875 -1.171875 -1.171875 -1.171875 -0.390625 0.390625 -0.390625 0.390625 1.171875 0.390625 1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 0.390625 -1.171875 -2.734375 -0.390625 -0.390625 -2.734375 0.390625 -1.171875 -1.953125 -0.390625 -1.953125 -1.171875 -0.390625 1.171875 -0.390625 -0.390625 2.734375 1.953125
</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" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.339 145.0 150.0 155.0 160.0 165.0 170.0 175.0 176.678 180.0 185.0 190.0 195.0 200.0 205.0 210.0 210.017 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 452.487 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.343 0.329 0.308 0.278 0.237 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.215 0.238 0.262 0.285 0.308 0.331 0.354 0.354 0.4 0.453 0.513 0.579 0.651 0.728 0.81 0.895 0.984 1.076 1.171 1.268 1.369 1.471 1.577 1.685 1.796 1.91 2.026 2.145 2.268 2.393 2.522 2.654 2.789 2.928 3.071 3.218 3.368 3.523 3.682 3.846 4.014 4.187 4.366 4.549 4.737 4.93 5.127 5.329 5.535 5.741 5.947 6.148 6.335 6.499 6.623 6.691 6.7 6.698 6.681 6.647 6.6 6.539 6.466 6.383 6.29 6.189 6.081 5.967 5.848 5.724 5.597 5.468 5.336 5.203 5.07 4.936 4.802 4.669 4.537 4.407 4.278 4.15 4.025 3.902 3.781 3.662 3.546 3.433 3.323 3.215 3.109 3.007 2.907 2.81 2.716 2.625 2.536 2.45 2.366 2.285 2.206 2.13 2.057 1.985 1.916 1.85 1.785 1.723 1.662 1.604 1.547 1.493 1.44 1.39 1.34 1.293 1.247 1.203 1.16 1.119 1.079 1.041 1.004 0.968 0.934 0.9 0.868 0.837 0.807 0.779 0.751 0.724 0.698 0.673 0.649 0.626 0.603 0.582 0.561 0.541 0.522 0.503 0.485 0.467 0.451 0.435 0.419 0.404 0.39 0.376 0.362 0.349 0.337 0.325 0.313 0.302 0.291 0.28 0.27 0.261 0.251 0.242 0.234 0.225 0.217 0.209 0.202

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="6.7" PeakHeight="452.487" Num="5" zHalfNm="395.026" Error="5.337">
-209.978 -54.764 29.674 -7.741 0.339
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="100.017" Depth="0.154"/>
<TopsideChapman PeakHeight="452.487" PeakDensity="556947.9" PeakScaleHeight="42.751" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
