<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-24 -083 19:10:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: 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" >
2026.03.24 (083) 19:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202608303241910009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="11.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.474" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.948" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="225.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="225.000" 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="10.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="485.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.665" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="387.792" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="273.786" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.641" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="155.483" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="60.601" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="82.704" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="173.720" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.620" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="164">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
225.000 225.000 225.000 225.000 230.000 230.000 232.692 235.385 238.077 240.769 243.462 246.154 248.846 251.538 254.231 256.923 259.615 262.308 265.000 265.000 265.000 265.000 270.000 270.000 270.000 270.000 272.500 275.000 277.500 280.000 282.500 285.000 285.000 285.000 285.000 285.000 285.000 287.500 290.000 295.000 296.667 298.333 300.000 300.000 301.000 302.000 303.000 304.000 305.000 310.000 310.000 310.000 312.500 315.000 315.000 315.000 320.000 320.000 320.000 322.500 325.000 330.000 330.000 330.000 330.000 332.500 335.000 337.500 340.000 340.000 340.000 340.000 345.000 345.000 347.500 350.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 425.000 427.500 430.000 430.000 432.500 435.000 435.000 440.000 440.000 440.000 445.000 445.000 450.000 452.500 455.000 455.000 460.000 460.000 460.000 465.000 470.000 470.000 475.000 475.000 480.000 480.000 485.000 485.000 490.000 495.000 500.000 500.000 505.000 510.000 515.000 520.000 525.000 530.000 535.000 541.667 548.333 555.000 565.833 576.667 587.500 598.333 610.791 624.152 638.518 654.008 670.757
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 51 60 54 57 54 0 51 0 0 0 0 51 0 0 0 0 0 48 57 0 63 63 63 63 60 0 0 0 0 0 60 63 63 60 54 48 0 63 63 0 0 0 63 0 0 0 0 0 60 63 60 0 0 60 57 57 63 63 0 63 51 0 60 63 54 60 0 51 0 63 63 60 66 57 66 66 69 69 69 63 66 69 63 66 69 66 66 60 66 66 66 69 66 69 63 66 57 63 66 63 66 66 69 63 69 60 66 69 66 69 57 69 69 57 66 69 57 66 69 60 60 63 60 63 54 0 51 60 51 60 63 60 54 60 54 60 54 57 54 51 57 57 54 54 51 51 0 42 0 45 45 0 0 45 0 45 0 45 0 45 48 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 -2.734375 2.734375 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 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 -2.734375 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -2.734375 -1.171875 0.390625 -0.390625 -0.390625 2.734375 1.171875 -0.390625 -0.390625 -2.734375 2.734375 1.953125 2.734375 -0.390625 -0.390625 -1.171875 1.171875
</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" >
89.607 90.0 95.0 100.0 105.0 110.0 114.772 115.0 119.545 120.0 124.317 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 387.792 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.232 1.79 2.307 2.579 2.665 2.542 2.542 2.542 2.554 2.665 2.684 2.819 2.953 3.087 3.224 3.364 3.508 3.658 3.814 3.977 4.146 4.323 4.508 4.699 4.897 5.102 5.311 5.525 5.742 5.961 6.181 6.402 6.623 6.842 7.06 7.276 7.49 7.701 7.911 8.118 8.323 8.525 8.725 8.922 9.118 9.31 9.5 9.688 9.873 10.055 10.233 10.407 10.577 10.742 10.9 11.051 11.192 11.321 11.437 11.535 11.612 11.667 11.696 11.7 11.699 11.691 11.676 11.653 11.622 11.585 11.541 11.491 11.435 11.373 11.306 11.234 11.157 11.076 10.99 10.901 10.808 10.712 10.613 10.511 10.407 10.3 10.191 10.08 9.967 9.853 9.737 9.62 9.502 9.384 9.264 9.145 9.024 8.904 8.783 8.662 8.542 8.421 8.301 8.181 8.061 7.942 7.824 7.706 7.589 7.473 7.357 7.243 7.129 7.017 6.905 6.795 6.685 6.577 6.47 6.364 6.259 6.155 6.053 5.952 5.852 5.753 5.656 5.56 5.465 5.371 5.279 5.188 5.098 5.01 4.923 4.837 4.752 4.669 4.587 4.506 4.426 4.348 4.271 4.195 4.12 4.047 3.974 3.903 3.833 3.764 3.697 3.63 3.564 3.5 3.437 3.374 3.313 3.253 3.194 3.136 3.079 3.022 2.967 2.913 2.86 2.807 2.756 2.705 2.656 2.607 2.559 2.512 2.466 2.42 2.376 2.332 2.289 2.247 2.205 2.165 2.125 2.085 2.047 2.009 1.972 1.935 1.899

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.665" PeakHeight="110.0" Num="3" Error="0.0">
-29.886 12.256 -2.763
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.665" EndFrequency="11.7" PeakHeight="387.792" Num="5" zHalfNm="273.786" Error="5.112">
-237.809 -34.814 14.524 -8.207 2.831
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="14.317" Depth="0.123"/>
<TopsideChapman PeakHeight="387.792" PeakDensity="1698387.1" PeakScaleHeight="82.704" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
