<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-31 -031 23:40:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% 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, 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" >
2026.01.31 (031) 23:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" 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">
FF202603101312340009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.140" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.805" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="350.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="350.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="380.803" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="361.901" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="345.189" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="5.856" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="28.704" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="4.934" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="12.308" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="52.060" 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="94">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
400.000 395.000 390.000 385.000 375.000 365.000 361.250 357.500 353.750 350.000 350.000 350.000 350.000 350.000 352.500 355.000 356.471 357.941 359.412 360.882 362.353 363.824 365.294 366.765 368.235 369.706 371.176 372.647 374.118 375.588 377.059 378.529 380.000 381.471 382.941 384.412 385.882 387.353 388.824 390.294 391.765 393.235 394.706 396.176 397.647 399.118 400.588 402.059 403.529 405.000 406.471 407.941 409.412 410.882 412.353 413.824 415.294 416.765 418.235 419.706 421.176 422.647 424.118 425.588 427.059 428.529 430.000 415.000 400.000 400.000 395.000 386.667 378.333 370.000 360.000 375.000 375.000 375.000 370.000 370.833 371.667 372.500 373.333 374.167 375.000 375.000 375.000 375.000 376.250 377.500 380.000 380.803 382.917 403.842
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 60 54 0 57 57 0 57 51 0 57 0 54 0 51 0 0 0 54 0 0 60 57 57 0 0 0 0 0 0 0 54 0 0 0 0 0 0 0 0 0 0 0 51 0 0 0 54 54 0 0 0 0 0 0 0 0 0 54 0 0 0 0 0 0 51 48 54 54 51 0 48 60 54 54 0 57 54 0 0 0 0 0 60 57 54 51 54 57 63 57 60 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 -0.390625 1.171875 0.390625 0.390625 1.171875 -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 1.171875 -1.171875 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -2.734375 0.390625 0.390625 1.953125 1.171875 0.390625 0.390625 2.734375 1.171875 0.390625 -0.390625 1.171875 2.734375 -1.171875 2.734375 1.171875 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 1.953125 1.953125 -0.390625 -1.171875 1.953125 -1.953125 0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 0.390625 0.390625 1.171875 -0.390625 1.171875 0.390625 1.171875 -0.390625 0.390625 1.171875 -0.390625 -0.390625 -0.390625 -2.734375 -2.734375 -1.171875 1.171875 1.171875 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 1.171875 -0.390625 2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="92">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.814 145.0 150.0 155.0 160.0 165.0 170.0 175.0 179.628 180.0 185.0 190.0 195.0 200.0 205.0 210.0 214.442 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 361.901 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.344 0.331 0.312 0.285 0.249 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.202 0.224 0.246 0.268 0.29 0.312 0.334 0.354 0.363 0.466 0.603 0.757 0.913 1.068 1.223 1.378 1.534 1.693 1.855 2.02 2.189 2.364 2.545 2.731 2.925 3.127 3.338 3.559 3.792 4.038 4.299 4.578 4.879 5.208 5.572 5.985 6.477 7.145 7.9 7.854 7.613 7.222 6.739 6.207 5.66 5.121 4.606 4.123 3.677 3.271 2.902 2.571 2.275 2.011 1.776 1.568 1.383 1.22 1.075 0.948 0.835 0.736 0.649 0.571 0.503 0.443 0.391 0.344 0.303 0.267 0.235 0.207

</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="7.9" PeakHeight="361.901" Num="5" zHalfNm="345.189" Error="6.71">
-107.36 -68.926 37.644 -8.797 -0.02
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="104.442" Depth="0.154"/>
<TopsideChapman PeakHeight="361.901" PeakDensity="774317.6" PeakScaleHeight="12.308" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
