<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-11 -042 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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: Moderate F-spread, F2o 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</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" >
2026.02.11 (042) 23:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.14" 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">
FF202604202112320009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.300" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.562" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.268" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="425.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="425.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="495.000" 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="5.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="441.241" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="379.663" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.259" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="91.866" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="17.138" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="46.103" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="98.930" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.520" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="79">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
465.000 455.000 450.000 440.000 440.667 441.333 442.000 442.667 443.333 444.000 444.667 445.333 446.000 446.667 447.333 448.000 448.667 449.333 450.000 448.333 446.667 445.000 445.000 443.333 441.667 440.000 440.000 432.500 425.000 435.000 445.000 445.833 446.667 447.500 448.333 449.167 450.000 450.000 450.000 455.000 455.000 455.000 455.000 455.000 455.000 455.000 455.000 455.000 455.000 455.000 455.000 455.000 450.000 450.000 447.500 445.000 448.571 452.143 455.714 459.286 462.857 466.429 470.000 473.571 477.143 480.714 484.286 487.857 491.429 495.000 515.000 525.000 535.000 540.000 545.000 547.647 550.294 573.216 621.943
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 54 0 57 0 57 60 60 60 69 69 57 60 57 54 57 63 63 0 60 57 69 72 66 66 63 0 57 0 66 0 0 0 0 63 54 60 63 63 69 66 66 69 54 63 54 0 54 0 51 51 54 51 0 51 0 0 0 0 0 0 0 0 0 54 0 54 60 57 54 51 63 63 60 0 51 51 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 -1.953125 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.953125 -0.390625 -1.171875 -1.171875 -1.171875 -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 -1.171875 0.390625 -0.390625 0.390625 -0.390625 1.953125 0.390625 -1.171875 -2.734375 -1.171875 -1.171875 0.390625 -1.953125 0.390625 2.734375 -0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 -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="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.242 145.0 150.0 155.0 160.0 165.0 170.0 175.0 178.485 180.0 185.0 190.0 195.0 200.0 205.0 210.0 212.727 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 441.241 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 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 0.283 0.244 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.207 0.229 0.252 0.274 0.297 0.319 0.342 0.354 0.375 0.427 0.489 0.562 0.646 0.741 0.844 0.956 1.075 1.201 1.332 1.469 1.611 1.758 1.911 2.068 2.232 2.4 2.574 2.753 2.939 3.13 3.326 3.529 3.738 3.953 4.175 4.402 4.636 4.876 5.121 5.372 5.627 5.887 6.149 6.413 6.676 6.936 7.19 7.432 7.658 7.861 8.034 8.169 8.259 8.298 8.3 8.295 8.272 8.232 8.177 8.108 8.026 7.933 7.829 7.717 7.596 7.468 7.334 7.195 7.052 6.906 6.756 6.605 6.453 6.299 6.146 5.992 5.839 5.687 5.536 5.387 5.239 5.094 4.951 4.81 4.671 4.535 4.402 4.271 4.144 4.019 3.897 3.778 3.662 3.549 3.439 3.332 3.228 3.126 3.027 2.931 2.838 2.748 2.66 2.574 2.492 2.411 2.333 2.258 2.185 2.114 2.045 1.978 1.914 1.851 1.79 1.732 1.675 1.62 1.567 1.515 1.465 1.417 1.37 1.325 1.281 1.239 1.198 1.158 1.12 1.083 1.047 1.012 0.979 0.946 0.915 0.885 0.855 0.827 0.799 0.773 0.747 0.722 0.698 0.675 0.653 0.631 0.61 0.59 0.57 0.551 0.533 0.515 0.498 0.481 0.465 0.45 0.435 0.42 0.406 0.393 0.38 0.367 0.355 0.343 0.332 0.321 0.31

</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="8.3" PeakHeight="441.241" Num="5" zHalfNm="379.663" Error="4.468">
-211.232 -30.358 18.748 -5.54 -0.132
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="102.727" Depth="0.154"/>
<TopsideChapman PeakHeight="441.241" PeakDensity="854714.6" PeakScaleHeight="46.103" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
