<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-20 -051 20:00:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 100%</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" >
2026.02.20 (051) 20:00:00</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">
FF202605102202000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="12.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.770" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="33.934" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.500" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="285.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="285.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="125.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="465.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.313" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="347.863" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="281.272" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.476" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.700" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="92.868" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.684" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="50.007" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="120.180" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.090" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="156">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
285.000 285.000 285.000 285.000 286.667 288.333 290.000 291.667 293.333 295.000 295.833 296.667 297.500 298.333 299.167 300.000 300.714 301.429 302.143 302.857 303.571 304.286 305.000 305.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 321.667 323.333 325.000 325.000 330.000 330.000 330.000 330.000 335.000 336.667 338.333 340.000 341.250 342.500 343.750 345.000 340.000 340.000 342.500 345.000 350.000 350.000 350.000 350.000 355.000 356.667 358.333 360.000 360.000 360.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 365.000 365.000 365.000 370.000 370.000 375.000 370.000 370.000 372.500 375.000 375.000 380.000 377.500 375.000 380.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 400.000 395.000 400.000 400.000 400.000 402.500 405.000 405.000 405.000 405.000 410.000 410.833 411.667 412.500 413.333 414.167 415.000 417.500 420.000 420.000 420.000 423.571 427.143 430.714 434.286 437.857 441.429 445.000 450.000 450.000 450.000 455.000 456.429 457.857 459.286 460.714 462.143 463.571 465.000 490.000 497.500 505.451 514.218
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 54 0 0 0 0 0 0 57 0 0 0 0 0 66 0 0 60 0 0 0 60 54 0 66 66 60 72 75 75 66 0 51 69 66 69 57 48 0 63 60 69 69 69 63 0 0 0 0 0 0 0 69 69 60 0 72 72 72 72 69 63 48 0 60 69 72 75 75 72 66 69 72 69 0 0 0 54 69 63 63 66 57 0 72 69 63 0 69 69 0 69 69 63 66 66 66 0 69 69 66 63 66 69 69 69 66 63 63 63 48 0 51 54 57 42 60 0 57 0 0 57 51 0 0 0 0 0 54 0 54 0 54 0 54 0 51 0 0 45 42 48 51 51 0 0 0 0 0 0 0 51 0 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 -1.953125 -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 -1.953125 -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 -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 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 1.953125 0.390625 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 -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 -2.734375 0.390625 -2.734375 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="37">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
125.000 125.000 122.500 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 125.000 125.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 120.000 120.000 120.000 120.000 117.500 115.000 115.000 117.000 119.000 121.000 123.000 125.000 130.000 132.500 135.000 135.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 0 57 0 0 0 0 0 0 57 60 60 57 60 72 63 0 54 0 60 63 0 63 0 0 63 54 0 0 0 0 51 48 0 45 48
</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 1.171875 0.390625 -0.390625 2.734375 -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 -0.390625 1.953125 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -2.734375 -0.390625 0.390625 0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.681 90.0 95.0 100.0 105.0 110.0 115.0 116.533 120.0 123.066 125.0 129.599 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 347.863 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.227 1.552 2.003 2.238 2.313 2.239 2.186 2.186 2.186 2.224 2.313 2.33 2.525 2.703 2.873 3.038 3.202 3.366 3.53 3.696 3.864 4.035 4.21 4.388 4.57 4.756 4.947 5.143 5.345 5.552 5.766 5.985 6.211 6.444 6.684 6.932 7.187 7.45 7.722 8.001 8.289 8.585 8.89 9.202 9.521 9.847 10.176 10.507 10.836 11.156 11.46 11.736 11.968 12.14 12.235 12.25 12.248 12.226 12.183 12.12 12.038 11.938 11.824 11.694 11.553 11.399 11.236 11.064 10.883 10.697 10.504 10.307 10.106 9.902 9.696 9.488 9.279 9.07 8.861 8.653 8.445 8.24 8.036 7.834 7.634 7.438 7.244 7.053 6.865 6.68 6.499 6.321 6.147 5.977 5.81 5.647 5.487 5.331 5.179 5.03 4.885 4.744 4.606 4.472 4.341 4.214 4.09 3.969 3.852 3.737 3.626 3.518 3.413 3.311 3.212 3.116 3.022 2.931 2.843 2.757 2.674 2.593 2.515 2.438 2.364 2.293 2.223 2.155 2.09 2.026 1.964 1.905 1.846 1.79 1.735 1.682 1.631 1.581 1.533 1.486 1.44 1.396 1.354 1.312 1.272 1.233 1.195 1.159 1.123 1.089 1.055 1.023 0.991 0.961 0.931 0.903 0.875 0.848 0.822 0.797 0.773 0.749 0.726 0.703 0.682 0.661 0.641 0.621 0.602 0.583 0.565 0.548 0.531 0.515 0.499 0.484 0.469 0.454 0.44 0.427 0.414 0.401 0.389 0.377 0.365 0.354 0.343

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.313" PeakHeight="110.0" Num="3" Error="0.0">
-29.496 11.704 -2.527
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.313" EndFrequency="12.25" PeakHeight="347.863" Num="5" zHalfNm="281.272" Error="2.64">
-175.705 -57.043 13.29 0.861 0.333
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="19.599" Depth="0.127"/>
<TopsideChapman PeakHeight="347.863" PeakDensity="1861817.6" PeakScaleHeight="50.007" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
