<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-28 -087 08:50:00.000"
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: 95% PACIFIC flags: Multiple candidates for F2o cusp</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" >
2026.03.28 (087) 08:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202608703280850009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="4.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.056" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="12.683" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="1.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="4.500" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="3.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="351.631" 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="0.880" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="1.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="1.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="311.450" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="240.887" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.826" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="100.474" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="4.958" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="54.945" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="92.810" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.960" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="48">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.8 1.85 1.9 1.95 2.0 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 3.85 3.9 3.95 4.0 4.05 4.1 4.15
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 255.000 255.000 260.000 262.500 265.000 265.000 265.000 265.000 266.667 268.333 270.000 271.923 273.846 275.769 277.692 279.615 281.538 283.462 285.385 287.308 289.231 291.154 293.077 295.000 295.000 300.000 300.000 305.000 310.000 312.293 314.826 317.641 320.786 324.324 328.332 332.912 338.194 344.354 351.631 360.358 371.018 384.332 401.432 424.201 456.018 503.614
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 0 0 57 66 0 57 0 0 69 0 0 66 0 0 0 0 0 0 0 63 0 57 0 0 63 69 69 75 75 66 75 72 0 72 75 69 66 63 66 63 75 63 57 63 60 51 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-2.734375 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 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 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.953125 1.953125 1.953125 1.953125 1.953125 2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="173">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.421 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 130.673 135.0 140.0 145.0 150.0 151.347 155.0 160.0 165.0 170.0 172.02 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 311.45 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.585 0.763 0.852 0.88 0.866 0.821 0.741 0.613 0.59 0.59 0.59 0.59 0.59 0.59 0.641 0.711 0.782 0.852 0.88 0.939 1.049 1.169 1.295 1.425 1.56 1.7 1.847 2.002 2.166 2.339 2.522 2.711 2.901 3.087 3.261 3.419 3.56 3.682 3.787 3.875 3.95 4.011 4.06 4.097 4.125 4.142 4.15 4.15 4.148 4.141 4.127 4.107 4.082 4.053 4.019 3.98 3.938 3.893 3.844 3.793 3.74 3.684 3.626 3.567 3.507 3.445 3.382 3.319 3.255 3.191 3.126 3.062 2.998 2.933 2.869 2.806 2.743 2.68 2.619 2.557 2.497 2.438 2.379 2.321 2.264 2.208 2.153 2.099 2.046 1.994 1.943 1.894 1.845 1.797 1.75 1.704 1.66 1.616 1.573 1.531 1.491 1.451 1.412 1.374 1.337 1.301 1.266 1.232 1.198 1.166 1.134 1.103 1.073 1.043 1.015 0.987 0.96 0.934 0.908 0.883 0.858 0.835 0.812 0.789 0.767 0.746 0.725 0.705 0.686 0.667 0.648 0.63 0.613 0.596 0.579 0.563 0.547 0.532 0.517 0.503 0.489 0.475 0.462 0.449 0.436 0.424 0.412 0.401 0.39 0.379 0.368 0.358 0.348 0.338 0.329 0.32 0.311 0.302 0.293 0.285 0.277 0.269 0.262 0.255 0.247 0.241 0.234 0.227 0.221 0.215 0.209 0.203

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.88" PeakHeight="110.0" Num="3" Error="0.0">
-25.906 7.383 -1.056
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.88" EndFrequency="4.15" PeakHeight="311.45" Num="5" zHalfNm="240.887" Error="1.603">
-149.654 17.085 -10.476 4.932 -1.317
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="62.02" Depth="0.29"/>
<TopsideChapman PeakHeight="311.45" PeakDensity="213678.66" PeakScaleHeight="54.945" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
