<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-19 -050 20:40:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x cusp, One of F2 cusps was derived from the other</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" >
2026.02.19 (050) 20:40:00</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">
FF202605002192040009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="11.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.809" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.605" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="450.910" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.803" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="348.170" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="287.203" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.324" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="85.085" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="30.601" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="43.216" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="103.010" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.220" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="176">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.5 2.55 2.6 2.65 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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 260.000 255.000 255.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 265.000 265.000 265.000 267.500 270.000 270.000 270.000 270.000 270.000 271.429 272.857 274.286 275.714 277.143 278.571 280.000 285.000 285.000 285.000 285.000 285.000 285.000 287.500 290.000 290.000 290.000 290.000 291.667 293.333 295.000 290.000 290.000 291.667 293.333 295.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 301.667 303.333 305.000 310.000 310.000 310.000 312.500 315.000 320.000 320.000 320.000 321.667 323.333 325.000 326.667 328.333 330.000 330.000 332.500 335.000 335.000 335.000 335.000 340.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 357.500 360.000 360.000 365.000 365.000 365.000 365.000 370.000 370.000 372.500 375.000 375.000 375.000 377.500 380.000 385.000 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 397.500 400.000 400.000 400.000 400.000 400.000 402.500 405.000 405.000 405.000 405.000 410.000 410.000 410.000 410.000 410.000 412.500 415.000 416.667 418.333 420.000 420.000 420.000 420.000 420.000 421.500 423.000 424.500 426.000 427.500 429.000 430.500 432.000 433.500 435.000 436.165 437.476 438.964 440.665 442.631 444.927 447.644 450.910 454.910 459.924 466.391 475.052 487.249
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 0 0 54 57 57 57 57 57 54 51 57 54 60 57 57 60 60 66 66 63 0 66 0 66 66 63 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 66 0 0 0 63 60 0 0 69 66 69 69 0 66 66 0 0 0 69 69 0 60 0 69 57 63 69 0 0 0 66 54 63 66 0 60 66 0 72 60 0 69 57 63 69 57 60 66 72 63 66 69 0 69 69 60 66 72 72 69 72 63 69 69 75 0 69 57 0 66 72 75 72 69 72 72 69 63 72 72 72 72 72 0 72 75 72 69 72 0 72 0 69 66 60 0 69 69 63 0 69 0 0 60 0 0 66 63 0 0 0 0 0 0 0 0 0 51 57 0 0 48 0 0 0 0 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
2.734375 -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 -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 1.171875 -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 -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 2.734375 -0.390625 -0.390625 2.734375 2.734375 -0.390625 -2.734375 -0.390625 -2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="182">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.821 90.0 95.0 100.0 105.0 110.0 115.0 119.333 120.0 125.0 128.665 130.0 135.0 137.998 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 348.17 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.215 1.207 1.562 1.745 1.803 1.764 1.666 1.666 1.666 1.666 1.686 1.759 1.803 1.841 1.936 2.035 2.138 2.247 2.361 2.483 2.614 2.753 2.903 3.065 3.24 3.427 3.629 3.844 4.072 4.312 4.563 4.821 5.086 5.355 5.628 5.902 6.177 6.452 6.728 7.004 7.279 7.556 7.833 8.111 8.39 8.672 8.957 9.245 9.537 9.833 10.134 10.436 10.734 11.009 11.208 11.25 11.248 11.223 11.172 11.097 11.0 10.883 10.747 10.596 10.432 10.255 10.067 9.871 9.668 9.458 9.244 9.027 8.807 8.585 8.363 8.141 7.92 7.7 7.482 7.266 7.054 6.844 6.638 6.435 6.237 6.042 5.852 5.666 5.485 5.308 5.136 4.968 4.804 4.645 4.491 4.341 4.195 4.054 3.917 3.784 3.655 3.53 3.409 3.292 3.179 3.069 2.963 2.861 2.761 2.665 2.573 2.483 2.396 2.313 2.232 2.154 2.078 2.005 1.935 1.867 1.801 1.738 1.677 1.617 1.56 1.505 1.452 1.401 1.352 1.304 1.258 1.213 1.17 1.129 1.089 1.05 1.013 0.977 0.943 0.909 0.877 0.846 0.816 0.787 0.759 0.732 0.706 0.681 0.657 0.634 0.611 0.59 0.569 0.549 0.529 0.51 0.492 0.475 0.458 0.442 0.426 0.411 0.396 0.382 0.369 0.356 0.343 0.331 0.319 0.308 0.297 0.286 0.276 0.266 0.257 0.248 0.239 0.23 0.222 0.214 0.207

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.803" PeakHeight="110.0" Num="3" Error="0.0">
-28.74 10.681 -2.12
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.803" EndFrequency="11.25" PeakHeight="348.17" Num="5" zHalfNm="287.203" Error="2.886">
-160.681 -59.916 18.203 -10.834 3.056
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="27.998" Depth="0.137"/>
<TopsideChapman PeakHeight="348.17" PeakDensity="1570254.4" PeakScaleHeight="43.216" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
