<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-21 -080 08:30:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 35% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, 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" >
2026.03.21 (080) 08:30:00</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">
FF202608003210830009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="5.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.969" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="16.627" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="7.150" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="380.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="380.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="115.000" Name="h`Es" 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="5.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="422.255" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.524" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="337.628" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="292.660" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.158" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.800" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="65.611" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="5.545" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="32.172" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="73.630" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.410" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="4.200" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="29">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
380.000 380.000 380.000 380.000 385.000 387.500 390.000 387.500 385.000 385.000 385.000 385.000 385.000 390.000 390.632 391.338 392.134 393.036 394.067 395.259 396.651 398.297 400.276 402.699 405.734 409.648 414.885 422.255 433.392
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 66 0 69 57 0 0 0 57 60 63 63 63 63 0 57 0 60 63 63 63 0 63 0 54 54 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
1.953125 1.171875 1.953125 1.171875 1.171875 1.953125 1.953125 1.953125 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 -0.390625 1.171875 1.953125 1.953125 1.171875 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="108">
<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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 110.000 110.000 110.000 110.000 109.167 108.333 107.500 106.667 105.833 105.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 111.667 113.333 115.000 112.500 110.000 112.500 115.000 117.500 120.000 120.000 120.000 117.500 115.000 115.000 115.417 115.833 116.250 116.667 117.083 117.500 117.917 118.333 118.750 119.167 119.583 120.000 120.000 120.000 125.000 120.000 119.615 119.231 118.846 118.462 118.077 117.692 117.308 116.923 116.538 116.154 115.769 115.385 115.000 117.500 120.000 120.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 112.500 110.000 112.500 115.000 115.000 115.000 115.000 115.000 115.000 115.556 116.111 116.667 117.222 117.778 118.333 118.889 119.444 120.000 120.000 120.000 122.500 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 78 0 0 72 0 0 0 0 0 60 78 69 72 0 0 78 0 78 81 75 0 0 66 0 78 0 0 0 66 0 75 0 72 75 72 0 72 0 0 0 0 0 63 63 63 66 57 69 63 69 0 0 0 63 0 0 63 63 0 0 63 0 63 0 0 0 72 72 0 75 0 0 72 75 69 75 0 54 0 75 72 66 0 0 72 60 0 69 69 63 60 63 57 57 63 57 51 54 0 0 0 54 0 0 54 0 54
</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 -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 -2.734375 -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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="133">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
91.49 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 137.607 140.0 145.0 150.0 155.0 160.0 165.0 165.214 170.0 175.0 180.0 185.0 190.0 192.821 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 337.628 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.347 0.454 0.507 0.524 0.517 0.495 0.457 0.397 0.302 0.225 0.225 0.225 0.225 0.225 0.225 0.225 0.225 0.277 0.331 0.385 0.439 0.493 0.524 0.57 0.668 0.768 0.878 1.003 1.146 1.308 1.488 1.68 1.879 2.082 2.284 2.484 2.683 2.88 3.075 3.27 3.464 3.659 3.855 4.052 4.252 4.454 4.659 4.866 5.074 5.277 5.459 5.581 5.6 5.597 5.573 5.526 5.459 5.375 5.276 5.164 5.042 4.912 4.775 4.633 4.488 4.341 4.192 4.044 3.896 3.75 3.606 3.464 3.325 3.19 3.058 2.93 2.805 2.685 2.569 2.457 2.348 2.244 2.144 2.048 1.955 1.867 1.782 1.7 1.622 1.548 1.476 1.408 1.343 1.28 1.221 1.164 1.11 1.058 1.008 0.961 0.916 0.873 0.832 0.793 0.755 0.72 0.686 0.653 0.623 0.593 0.565 0.539 0.513 0.489 0.466 0.444 0.423 0.403 0.384 0.366 0.348 0.332 0.316 0.301 0.287 0.273 0.26 0.248 0.236 0.225 0.214 0.204

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.524" PeakHeight="110.0" Num="3" Error="0.0">
-22.679 4.614 -0.445
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.524" EndFrequency="5.6" PeakHeight="337.628" Num="5" zHalfNm="292.66" Error="3.279">
-128.296 -28.741 18.64 -9.395 2.985
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="82.821" Depth="0.299"/>
<TopsideChapman PeakHeight="337.628" PeakDensity="389081.88" PeakScaleHeight="32.172" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
