<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 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="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 F2o 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" >
2026.02.23 (054) 22:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605402232230009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.575" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.693" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.500" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="335.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="335.000" 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="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="502.431" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="418.200" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="359.707" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.696" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="86.594" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="19.813" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="43.790" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="90.280" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.630" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="140">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.25 2.3 2.35 2.4 2.45 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
335.000 335.000 335.000 335.000 337.000 339.000 341.000 343.000 345.000 345.455 345.909 346.364 346.818 347.273 347.727 348.182 348.636 349.091 349.545 350.000 350.000 350.000 350.000 350.000 350.000 352.500 355.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.714 366.429 367.143 367.857 368.571 369.286 370.000 370.000 370.000 370.000 370.000 370.625 371.250 371.875 372.500 373.125 373.750 374.375 375.000 380.000 380.000 380.000 381.364 382.727 384.091 385.455 386.818 388.182 389.545 390.909 392.273 393.636 395.000 395.000 395.000 395.000 397.500 400.000 400.000 401.667 403.333 405.000 405.000 405.000 405.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 425.000 425.000 425.000 426.667 428.333 430.000 431.667 433.333 435.000 435.000 440.000 440.000 445.000 445.000 447.500 450.000 450.000 455.000 455.000 455.000 460.000 460.000 465.000 465.000 465.000 470.000 475.000 475.000 475.000 480.000 485.000 490.000 492.500 495.000 495.000 497.177 499.634 502.431 505.643 509.370 513.745 518.955 525.264 533.059 542.937 555.862
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 69 0 69 0 0 0 0 51 0 57 0 0 0 0 0 0 0 0 60 60 66 0 60 0 0 60 72 0 72 75 75 72 72 63 0 60 48 0 0 0 0 0 0 48 51 0 0 63 0 0 0 0 57 0 0 0 54 0 60 0 0 0 0 0 0 0 0 57 0 51 51 57 60 0 57 54 0 0 54 0 0 60 57 60 63 51 60 63 66 66 60 63 63 60 60 57 0 0 57 0 0 63 63 66 69 63 63 48 63 72 63 69 69 66 69 60 63 63 63 54 60 60 60 57 48 0 57 63 63 60 57 60 60 57 57 54 51 0 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 1.171875 -0.390625 0.390625 0.390625 -1.953125 0.390625 -0.390625 0.390625 2.734375 0.390625 -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 2.734375 1.171875 -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 -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 -2.734375 -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 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
</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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 141.994 145.0 150.0 155.0 160.0 165.0 170.0 173.987 175.0 180.0 185.0 190.0 195.0 200.0 205.0 205.981 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 418.2 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.342 0.326 0.303 0.271 0.224 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.205 0.229 0.253 0.277 0.301 0.325 0.349 0.354 0.421 0.499 0.577 0.659 0.746 0.84 0.942 1.052 1.172 1.302 1.442 1.594 1.757 1.932 2.12 2.319 2.53 2.753 2.987 3.233 3.489 3.757 4.034 4.32 4.615 4.919 5.23 5.547 5.87 6.196 6.525 6.853 7.178 7.498 7.807 8.101 8.375 8.621 8.832 9.002 9.122 9.188 9.2 9.198 9.179 9.138 9.079 9.001 8.907 8.799 8.679 8.547 8.405 8.255 8.098 7.934 7.766 7.594 7.419 7.242 7.063 6.884 6.705 6.526 6.348 6.172 5.997 5.825 5.655 5.487 5.323 5.161 5.003 4.848 4.697 4.549 4.404 4.264 4.126 3.993 3.863 3.736 3.613 3.494 3.378 3.265 3.156 3.05 2.948 2.848 2.752 2.659 2.568 2.481 2.396 2.314 2.235 2.158 2.084 2.012 1.943 1.876 1.811 1.748 1.688 1.629 1.573 1.518 1.466 1.415 1.366 1.318 1.272 1.228 1.185 1.144 1.104 1.065 1.028 0.992 0.958 0.924 0.892 0.861 0.831 0.802 0.774 0.747 0.721 0.695 0.671 0.648 0.625 0.603 0.582 0.562 0.542 0.523 0.505 0.487 0.47 0.453 0.438 0.422 0.407 0.393 0.379 0.366 0.353 0.341 0.329 0.317 0.306 0.296 0.285 0.275 0.266 0.256 0.247 0.239

</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="9.2" PeakHeight="418.2" Num="5" zHalfNm="359.707" Error="3.715">
-198.342 -23.773 10.771 -2.361 1.486
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="95.981" Depth="0.154"/>
<TopsideChapman PeakHeight="418.2" PeakDensity="1050124.1" PeakScaleHeight="43.79" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
