<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-27 -086 22:30:00.000"
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" >
2026.03.27 (086) 22:30:00</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">
FF202608603272230009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="4.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.726" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="12.814" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="400.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="400.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="4.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.475" 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="4.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="415.189" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="378.223" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.428" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="57.454" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="3.617" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="27.905" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="83.060" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="38">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
500.000 490.000 485.000 480.000 476.667 473.333 470.000 470.000 470.000 475.000 480.000 480.000 472.500 465.000 457.500 450.000 460.000 470.000 455.000 415.000 411.667 408.333 405.000 402.500 400.000 480.000 480.065 480.141 480.233 480.345 480.487 480.669 480.913 481.257 481.779 482.664 484.490 490.475
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 0 0 60 0 0 57 0 57 0 60 63 0 0 0 63 0 51 63 51 0 0 54 51 57 51 0 0 0 0 0 60 0 0 0 57 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.953125 -0.390625 -0.390625 -0.390625 0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.953125 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.953125 -0.390625 -0.390625 -1.171875 -1.953125 -1.171875 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="135">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 142.692 145.0 150.0 155.0 160.0 165.0 170.0 175.0 175.384 180.0 185.0 190.0 195.0 200.0 205.0 208.076 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 415.189 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0
</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 0.328 0.306 0.275 0.231 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.222 0.245 0.269 0.292 0.316 0.34 0.354 0.364 0.395 0.436 0.491 0.561 0.642 0.726 0.809 0.889 0.967 1.044 1.119 1.194 1.269 1.345 1.421 1.497 1.575 1.655 1.736 1.819 1.904 1.992 2.082 2.175 2.272 2.372 2.477 2.586 2.701 2.821 2.948 3.083 3.226 3.379 3.544 3.722 3.916 4.127 4.354 4.578 4.7 4.7 4.687 4.647 4.585 4.504 4.406 4.294 4.172 4.042 3.906 3.766 3.623 3.479 3.336 3.193 3.053 2.916 2.781 2.651 2.524 2.402 2.284 2.171 2.062 1.958 1.858 1.762 1.671 1.584 1.501 1.423 1.348 1.276 1.209 1.144 1.083 1.025 0.97 0.918 0.869 0.822 0.778 0.736 0.696 0.659 0.623 0.589 0.557 0.527 0.499 0.471 0.446 0.422 0.399 0.377 0.357 0.337 0.319 0.302 0.285 0.27 0.255 0.241 0.228 0.216 0.204

</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="4.7" PeakHeight="415.189" Num="5" zHalfNm="378.223" Error="12.171">
-158.225 -74.635 34.588 -5.322 -3.519
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="98.076" Depth="0.154"/>
<TopsideChapman PeakHeight="415.189" PeakDensity="274069.47" PeakScaleHeight="27.905" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
