<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-15 -074 23:10:00.000"
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 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, Unidentified traces above foF2</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" >
2026.03.15 (074) 23:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607403152310009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.855" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.549" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.200" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="340.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="340.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="432.202" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="375.473" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="332.978" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.958" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="62.454" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="13.906" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="32.663" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="65.740" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.530" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="129">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
340.000 340.000 340.000 340.000 340.000 340.000 342.500 345.000 345.714 346.429 347.143 347.857 348.571 349.286 350.000 346.667 343.333 340.000 342.500 345.000 344.583 344.167 343.750 343.333 342.917 342.500 342.083 341.667 341.250 340.833 340.417 340.000 345.000 345.000 345.000 347.500 350.000 352.500 355.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 352.000 354.000 356.000 358.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 359.167 358.333 357.500 356.667 355.833 355.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 365.000 365.000 363.333 361.667 360.000 362.500 365.000 365.000 365.000 365.000 370.000 370.000 370.000 365.000 367.500 370.000 370.000 370.000 370.667 371.333 372.000 372.667 373.333 374.000 374.667 375.333 376.000 376.667 377.333 378.000 378.667 379.333 380.000 390.000 395.000 400.000 405.000 407.500 410.000 410.000 412.500 415.000 416.250 417.500 418.750 420.000 422.360 425.105 428.338 432.202 436.902 442.741 450.193 460.030 473.616 493.601
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 54 0 57 57 0 60 51 0 0 54 0 54 54 0 0 57 0 57 60 0 0 0 0 54 0 0 60 51 0 51 60 0 60 54 0 0 0 57 60 0 60 57 54 60 63 57 0 0 54 54 0 54 0 0 0 60 54 54 57 54 60 66 63 60 60 63 0 0 60 0 60 63 63 0 60 57 57 60 57 0 63 60 60 63 54 0 60 54 60 60 0 0 0 0 0 0 0 0 0 0 0 54 57 48 57 0 63 60 60 60 57 54 60 54 0 0 57 57 0 54 0 54 0 0 48 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 1.171875 0.390625 0.390625 -0.390625 -1.171875 0.390625 -0.390625 0.390625 -0.390625 -1.171875 -0.390625 0.390625 -0.390625 -1.171875 0.390625 0.390625 -0.390625 0.390625 -1.171875 -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 -1.953125 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 0.390625 -0.390625 -0.390625 1.953125 -0.390625 -0.390625 -0.390625 1.953125 -0.390625 0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -1.953125 -0.390625 -0.390625 -2.734375 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 0.390625 -0.390625 0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -2.734375 -1.171875 -0.390625 -1.171875 2.734375 -0.390625 -1.171875 0.390625 0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -2.734375 -1.171875 -1.953125 -1.953125 1.171875 1.171875 1.953125 -0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="152">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.317 145.0 150.0 155.0 160.0 165.0 170.0 175.0 178.634 180.0 185.0 190.0 195.0 200.0 205.0 210.0 212.951 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 375.473 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.344 0.33 0.31 0.283 0.245 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.206 0.229 0.251 0.273 0.296 0.318 0.341 0.354 0.38 0.461 0.568 0.693 0.827 0.967 1.112 1.263 1.421 1.588 1.764 1.953 2.155 2.374 2.61 2.867 3.148 3.456 3.795 4.168 4.579 5.027 5.51 6.019 6.538 7.046 7.52 7.941 8.295 8.575 8.778 8.903 8.95 8.95 8.934 8.88 8.793 8.677 8.536 8.373 8.191 7.995 7.786 7.568 7.344 7.114 6.882 6.648 6.414 6.182 5.952 5.726 5.503 5.286 5.073 4.866 4.665 4.47 4.281 4.098 3.921 3.751 3.587 3.43 3.278 3.132 2.992 2.858 2.73 2.606 2.488 2.375 2.267 2.163 2.064 1.97 1.879 1.793 1.71 1.631 1.556 1.484 1.416 1.35 1.287 1.228 1.171 1.116 1.065 1.015 0.968 0.923 0.88 0.839 0.8 0.763 0.727 0.693 0.661 0.63 0.601 0.573 0.546 0.52 0.496 0.473 0.451 0.43 0.41 0.391 0.372 0.355 0.339 0.323 0.308 0.293 0.28 0.267 0.254 0.242 0.231 0.22 0.21 0.2

</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="8.95" PeakHeight="375.473" Num="5" zHalfNm="332.978" Error="3.81">
-149.473 -18.193 3.191 4.923 -2.97
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="102.951" Depth="0.154"/>
<TopsideChapman PeakHeight="375.473" PeakDensity="993827.56" PeakScaleHeight="32.663" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
