<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-21 -294 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="12.0">
<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" >
2026.10.21 (294) 22:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.39" 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">
FF202629410212230009039031101000005012000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="6.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.508" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="17.177" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="1.900" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="485.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="485.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="95.000" 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="0.750" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="478.613" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="425.280" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.181" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.150" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="82.183" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="10.657" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="40.186" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="102.660" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.050" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="77">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
490.000 489.167 488.333 487.500 486.667 485.833 485.000 490.000 490.000 490.000 490.000 493.333 496.667 500.000 500.000 500.000 500.000 500.000 496.667 493.333 490.000 495.000 500.000 505.000 502.500 500.000 500.000 500.000 495.000 496.667 498.333 500.000 500.000 500.000 505.000 510.000 510.000 510.000 515.000 515.000 515.000 515.000 515.000 515.000 515.000 515.000 515.000 515.000 515.000 515.000 520.000 525.000 520.000 515.000 510.000 507.500 505.000 503.333 501.667 500.000 498.333 496.667 495.000 493.333 491.667 490.000 510.000 517.500 525.000 533.218 542.606 553.435 566.063 580.980 598.869 620.718 648.004
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 0 0 0 0 0 0 63 0 66 0 0 0 63 0 0 0 57 57 0 57 0 0 63 66 66 0 63 57 0 0 63 57 0 63 63 0 66 63 66 0 0 63 60 63 0 0 0 0 60 57 0 0 0 63 0 60 0 0 57 0 0 0 0 0 0 60 0 54 0 0 0 51 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -1.953125 -1.171875 -1.953125 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 -0.390625 -1.953125 -1.171875 -1.171875 -2.734375 -1.171875 0.390625 0.390625 -0.390625 -2.734375 -1.953125 -1.171875 0.390625 -0.390625 -1.953125 -0.390625 -1.953125 0.390625 -2.734375 0.390625 0.390625 -2.734375 1.171875 -1.953125 0.390625 -1.171875 -0.390625 -0.390625 -1.953125 -1.171875 -0.390625 -1.171875 -1.953125 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -1.953125 -1.171875 -1.171875 0.390625 1.171875 1.171875 0.390625 -0.390625 0.390625 -2.734375 -1.171875 -1.953125 -0.390625 -1.171875 1.171875 -0.390625 -1.953125 -1.953125 -1.171875 -2.734375 -1.953125 -1.171875 -1.953125 1.953125 -0.390625 -2.734375 -1.953125 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="16">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 95.000 95.000 95.000 95.000 96.250 97.500 98.750 100.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 63 0 0 63 63 69 60 0 0 57 0 69 0 69
</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 -1.171875 -2.734375 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="186">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.501 145.0 150.0 155.0 160.0 165.0 170.0 175.0 177.002 180.0 185.0 190.0 195.0 200.0 205.0 210.0 210.503 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 478.613 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0
</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 0.329 0.308 0.279 0.238 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.214 0.237 0.26 0.283 0.306 0.329 0.352 0.354 0.382 0.42 0.468 0.526 0.595 0.671 0.751 0.833 0.916 0.999 1.082 1.165 1.249 1.333 1.418 1.503 1.59 1.678 1.768 1.859 1.952 2.046 2.143 2.242 2.344 2.448 2.555 2.665 2.777 2.894 3.014 3.137 3.265 3.397 3.533 3.675 3.822 3.974 4.132 4.297 4.468 4.647 4.833 5.027 5.229 5.44 5.657 5.881 6.108 6.331 6.54 6.713 6.824 6.85 6.849 6.834 6.8 6.748 6.682 6.602 6.51 6.407 6.295 6.175 6.048 5.916 5.78 5.64 5.498 5.354 5.209 5.063 4.918 4.773 4.63 4.488 4.348 4.21 4.074 3.941 3.81 3.683 3.558 3.437 3.319 3.203 3.091 2.983 2.877 2.774 2.675 2.579 2.486 2.395 2.308 2.224 2.142 2.063 1.987 1.914 1.843 1.774 1.708 1.644 1.583 1.524 1.467 1.412 1.359 1.308 1.258 1.211 1.165 1.121 1.079 1.038 0.999 0.961 0.925 0.89 0.856 0.823 0.792 0.762 0.733 0.705 0.679 0.653 0.628 0.604 0.581 0.559 0.538 0.517 0.498 0.479 0.46 0.443 0.426 0.41 0.394 0.379 0.365 0.351 0.337 0.325 0.312 0.3 0.289 0.278 0.267 0.257 0.247 0.238 0.229 0.22 0.212 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="6.85" PeakHeight="478.613" Num="5" zHalfNm="425.28" Error="8.918">
-220.7 -76.758 38.872 -6.762 -2.762
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="100.503" Depth="0.154"/>
<TopsideChapman PeakHeight="478.613" PeakDensity="582165.0" PeakScaleHeight="40.186" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
