<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-02 -033 06:40:00.000"
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, F2x 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" >
2026.02.02 (033) 06:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.13" 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">
FF202603302020640009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.465" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.387" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="240.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="240.000" 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="0.550" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="296.017" 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="284.869" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="256.954" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="2.347" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="40.722" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="5.074" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="21.091" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="40.970" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.950" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="88">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
250.000 245.000 242.500 240.000 240.000 240.000 242.500 245.000 245.000 245.000 245.000 245.000 255.000 255.000 255.000 255.000 255.000 260.000 265.000 265.000 266.667 268.333 270.000 270.000 275.000 275.000 280.000 285.000 290.000 285.000 285.000 285.000 285.000 284.643 284.286 283.929 283.571 283.214 282.857 282.500 282.143 281.786 281.429 281.071 280.714 280.357 280.000 280.000 280.000 280.000 280.000 280.000 280.000 282.778 285.556 288.333 291.111 293.889 296.667 299.444 302.222 305.000 300.000 310.000 300.000 265.000 280.000 280.000 280.000 280.000 281.500 282.400 283.406 284.537 285.817 287.279 288.963 290.926 293.242 296.017 299.400 303.618 309.023 316.197 326.178 341.016 365.397 412.889
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 69 0 69 0 75 0 72 78 78 0 72 69 69 69 0 69 66 66 63 0 63 63 63 57 60 0 0 54 57 60 0 57 0 0 66 66 0 0 0 0 0 0 0 0 0 0 0 0 0 0 60 0 0 0 0 0 0 0 0 57 54 60 54 57 69 75 72 72 72 0 0 72 0 63 66 66 66 60 63 69 63 57 60 48 51 57 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 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 0.390625 0.390625 0.390625 0.390625 0.390625 -1.171875 0.390625 0.390625 1.171875 -0.390625 0.390625 -1.171875 0.390625 -0.390625 -1.171875 0.390625 -1.171875 1.171875 1.171875 -1.171875 1.953125 1.171875 -1.171875 1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="98">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 140.333 145.0 150.0 155.0 160.0 165.0 170.0 170.667 175.0 180.0 185.0 190.0 195.0 200.0 201.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 284.869 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.341 0.323 0.297 0.26 0.205 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.222 0.247 0.273 0.298 0.324 0.349 0.354 0.446 0.631 0.893 1.208 1.561 1.955 2.392 2.874 3.4 3.963 4.545 5.121 5.656 6.113 6.462 6.679 6.75 6.75 6.713 6.613 6.463 6.271 6.048 5.803 5.543 5.274 5.001 4.728 4.46 4.197 3.943 3.698 3.464 3.241 3.028 2.828 2.638 2.46 2.293 2.135 1.988 1.85 1.722 1.601 1.489 1.385 1.287 1.196 1.112 1.033 0.96 0.892 0.829 0.77 0.715 0.664 0.617 0.573 0.532 0.494 0.459 0.426 0.396 0.368 0.341 0.317 0.294 0.273 0.254 0.236 0.219 0.203

</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="6.75" PeakHeight="284.869" Num="5" zHalfNm="256.954" Error="3.173">
-83.105 -1.211 1.205 -0.107 -0.651
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="91.0" Depth="0.154"/>
<TopsideChapman PeakHeight="284.869" PeakDensity="565291.56" PeakScaleHeight="21.091" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
