<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-01 -032 23:20:00.000"
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" >
2026.02.01 (032) 23:20:00</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">
FF202603202012320009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.423" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.933" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="415.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="415.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="535.000" 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="4.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="493.606" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="439.214" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.259" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="83.425" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="18.742" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="40.963" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="102.080" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.120" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="126">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.0 9.05
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
485.000 480.000 475.000 470.000 455.000 505.000 500.000 495.000 490.000 485.000 480.000 470.000 460.000 480.000 481.250 482.500 483.750 485.000 475.000 465.000 465.000 465.000 459.000 453.000 447.000 441.000 435.000 432.500 430.000 430.000 430.000 430.000 430.000 430.000 425.000 425.000 425.000 425.000 422.500 420.000 417.500 415.000 417.917 420.833 423.750 426.667 429.583 432.500 435.417 438.333 441.250 444.167 447.083 450.000 455.000 460.000 465.000 472.500 480.000 483.824 487.647 491.471 495.294 499.118 502.941 506.765 510.588 514.412 518.235 522.059 525.882 529.706 533.529 537.353 541.176 545.000 550.000 550.000 550.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 555.000 556.667 558.333 560.000 570.000 565.000 570.000 575.000 575.000 575.000 575.000 575.000 555.000 555.000 555.000 548.333 541.667 535.000 544.000 553.000 562.000 571.000 580.000 580.000 585.000 590.000 595.000 602.662 614.041
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 57 54 57 51 0 0 0 57 54 0 54 51 54 51 0 54 51 48 0 48 0 0 0 0 48 0 57 57 0 0 57 51 57 0 0 57 0 48 0 48 54 48 0 0 0 51 0 0 0 0 0 0 48 0 48 0 48 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 48 48 0 48 51 54 51 0 48 48 0 51 48 0 0 0 0 0 0 48 0 0 48 0 0 48 48 51 51 51 51 51 51 51 48 0 45 0 0 48 0 0 45 0 48 51 45 48 48 45 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.953125 -2.734375 -2.734375 -1.171875 -0.390625 -1.953125 -2.734375 -1.171875 -2.734375 -2.734375 -2.734375 1.953125 -2.734375 -2.734375 -2.734375 -1.953125 -0.390625 -2.734375 -2.734375 -2.734375 -0.390625 -1.953125 1.171875 -1.953125 -1.171875 0.390625 -1.171875 -0.390625 -1.171875 -1.953125 -1.953125 2.734375 -1.953125 1.953125 -1.171875 -1.953125 1.953125 -1.171875 2.734375 -1.953125 2.734375 -1.953125 -1.171875 -1.953125 -1.953125 2.734375 -1.171875 -1.171875 -1.953125 -2.734375 2.734375 1.953125 -2.734375 -1.953125 -1.953125 -0.390625 -1.953125 2.734375 -1.953125 1.171875 -2.734375 -2.734375 -0.390625 1.171875 -1.953125 1.953125 -0.390625 -1.171875 0.390625 -0.390625 -1.953125 -1.171875 0.390625 -1.953125 -0.390625 0.390625 1.953125 0.390625 -1.953125 0.390625 1.171875 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -1.171875 -1.953125 0.390625 -1.953125 -1.953125 -1.953125 -0.390625 1.171875 -1.171875 -2.734375 0.390625 -0.390625 1.171875 1.171875 1.171875 0.390625 -0.390625 -1.171875 0.390625 0.390625 0.390625 -1.171875 -0.390625 -1.171875 0.390625 -2.734375 -2.734375 -2.734375 -2.734375 -1.171875 0.390625 -2.734375 -0.390625 1.171875 1.171875 -1.171875 -1.171875 -0.390625 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.162 145.0 150.0 155.0 160.0 165.0 170.0 175.0 178.323 180.0 185.0 190.0 195.0 200.0 205.0 210.0 212.485 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 493.606 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</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 0.282 0.244 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.208 0.23 0.253 0.275 0.298 0.32 0.343 0.354 0.39 0.459 0.526 0.592 0.66 0.728 0.798 0.87 0.943 1.019 1.097 1.177 1.26 1.345 1.433 1.524 1.618 1.715 1.816 1.92 2.027 2.138 2.253 2.372 2.495 2.622 2.754 2.891 3.032 3.179 3.331 3.489 3.652 3.822 3.998 4.18 4.37 4.567 4.771 4.983 5.204 5.433 5.672 5.919 6.176 6.442 6.717 7.001 7.292 7.589 7.887 8.18 8.459 8.707 8.904 9.023 9.05 9.049 9.029 8.986 8.92 8.836 8.733 8.616 8.484 8.34 8.186 8.024 7.854 7.679 7.498 7.315 7.128 6.941 6.752 6.564 6.376 6.189 6.004 5.822 5.641 5.464 5.29 5.119 4.952 4.789 4.629 4.473 4.322 4.174 4.031 3.891 3.755 3.624 3.496 3.373 3.253 3.137 3.025 2.916 2.811 2.709 2.611 2.516 2.425 2.336 2.251 2.169 2.089 2.012 1.938 1.867 1.798 1.732 1.668 1.606 1.547 1.49 1.434 1.381 1.33 1.28 1.233 1.187 1.143 1.1 1.059 1.02 0.982 0.945 0.91 0.876 0.843 0.812 0.782 0.752 0.724 0.697 0.671 0.646 0.622 0.599 0.576 0.555 0.534 0.514 0.495 0.476 0.459 0.442 0.425 0.409 0.394 0.379 0.365 0.351 0.338 0.325 0.313

</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="9.05" PeakHeight="493.606" Num="5" zHalfNm="439.214" Error="8.946">
-234.314 -77.924 34.262 -3.196 0.051
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="102.485" Depth="0.154"/>
<TopsideChapman PeakHeight="493.606" PeakDensity="1016160.06" PeakScaleHeight="40.963" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
