<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 22:10:00.000"
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, F2x 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" >
2026.02.22 (053) 22:10:00</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">
FF202605302222210009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.445" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="19.193" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="395.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="395.000" 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="7.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="527.384" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="457.243" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="383.414" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.843" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="108.726" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="18.326" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="55.865" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="113.750" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.650" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="100">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
395.000 395.000 396.667 398.333 400.000 402.500 405.000 405.000 410.000 413.333 416.667 420.000 425.000 424.375 423.750 423.125 422.500 421.875 421.250 420.625 420.000 420.000 422.500 425.000 425.000 425.000 425.000 425.000 423.333 421.667 420.000 415.000 420.000 415.000 410.000 415.000 415.000 410.000 410.000 410.000 410.000 410.000 407.500 405.000 405.000 400.000 410.000 410.000 415.000 420.000 425.000 430.000 435.000 440.000 445.000 450.000 455.000 460.000 465.000 470.000 465.000 466.563 468.125 469.688 471.250 472.813 474.375 475.938 477.500 479.063 480.625 482.188 483.750 485.313 486.875 488.438 490.000 490.000 492.500 495.000 497.500 499.784 502.254 504.933 507.848 511.033 514.527 518.376 522.638 527.384 532.700 538.696 545.512 553.326 562.378 572.985 585.586 600.802 619.542 643.188
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 0 0 57 0 57 60 60 0 0 54 60 0 57 57 0 0 0 0 51 54 0 51 0 0 63 57 0 0 57 0 57 54 60 54 51 57 0 51 0 54 0 48 54 51 54 54 0 0 0 0 0 54 54 0 57 57 54 51 54 0 0 0 0 0 0 54 0 0 0 54 0 48 0 0 48 57 0 0 48 51 0 0 0 0 0 0 0 0 0 51 0 0 48 0 0 45 51 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 -1.953125 -0.390625 -0.390625 -0.390625 0.390625 -1.171875 0.390625 -1.953125 -0.390625 -1.171875 -0.390625 -1.953125 -0.390625 -1.171875 -2.734375 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 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -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 -1.171875 -2.734375 0.390625 1.171875 2.734375 1.953125 -0.390625 -2.734375 -1.953125 -1.171875 -0.390625 -1.171875 1.171875 1.171875 -2.734375 -0.390625 0.390625 1.953125 -0.390625 -2.734375 0.390625 1.953125 -1.171875 -1.953125 -0.390625 -1.171875 1.171875 2.734375 1.171875 -0.390625 -2.734375 2.734375 -2.734375 -1.953125 -0.390625 -1.171875 -1.953125 -2.734375 -2.734375
</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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 140.433 145.0 150.0 155.0 160.0 165.0 170.0 170.867 175.0 180.0 185.0 190.0 195.0 200.0 201.3 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 457.243 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 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 0.341 0.323 0.297 0.26 0.206 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.221 0.246 0.272 0.297 0.322 0.347 0.354 0.387 0.438 0.497 0.563 0.636 0.715 0.798 0.885 0.976 1.071 1.17 1.273 1.38 1.491 1.607 1.727 1.852 1.983 2.118 2.26 2.407 2.56 2.72 2.886 3.059 3.239 3.426 3.619 3.82 4.027 4.242 4.462 4.687 4.918 5.152 5.389 5.626 5.863 6.097 6.326 6.548 6.76 6.96 7.145 7.313 7.461 7.588 7.691 7.769 7.822 7.847 7.85 7.848 7.836 7.812 7.778 7.734 7.681 7.619 7.55 7.474 7.391 7.303 7.21 7.111 7.009 6.903 6.794 6.682 6.569 6.453 6.336 6.217 6.098 5.978 5.858 5.739 5.619 5.5 5.381 5.263 5.146 5.03 4.916 4.802 4.691 4.58 4.472 4.364 4.259 4.155 4.053 3.953 3.855 3.759 3.664 3.572 3.481 3.392 3.305 3.22 3.137 3.056 2.976 2.899 2.823 2.749 2.676 2.606 2.537 2.469 2.404 2.34 2.277 2.216 2.157 2.099 2.043 1.988 1.934 1.882 1.831 1.782 1.733 1.687 1.641 1.596 1.553 1.511 1.47 1.429 1.391 1.353 1.316 1.28 1.245 1.211 1.178 1.145 1.114 1.084 1.054 1.025 0.997 0.97 0.943 0.917 0.892 0.867 0.844 0.82 0.798 0.776 0.755 0.734 0.714 0.694 0.675 0.656 0.638 0.621

</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="7.85" PeakHeight="457.243" Num="5" zHalfNm="383.414" Error="4.71">
-242.339 -22.782 10.177 0.639 -1.638
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="91.3" Depth="0.154"/>
<TopsideChapman PeakHeight="457.243" PeakDensity="764547.1" PeakScaleHeight="55.865" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
