<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 15:30:00.000"
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="1 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 0 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" >
2026.02.26 (057) 15:30:00</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">
FF202605702261530009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="9.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.804" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.616" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="5.350" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.400" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.560" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="315.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="315.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="96.789" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="121.667" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="93.262" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="5.080" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="430.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.398" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.364" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="303.128" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="209.016" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.612" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.600" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="113.832" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="35.681" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="67.535" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="173.850" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.030" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="77">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
315.000 315.000 316.667 318.333 320.000 321.667 323.333 325.000 326.667 328.333 330.000 330.000 335.000 330.000 332.500 335.000 340.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 370.000 370.000 370.000 370.000 372.500 375.000 380.000 382.500 385.000 385.000 385.000 385.000 387.500 390.000 395.000 395.000 395.000 400.000 405.000 405.000 410.000 410.000 410.000 412.500 415.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 430.000 437.500 445.000 448.574 452.809 457.906 464.160 472.013 482.171 495.820 515.134
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 0 45 0 0 0 0 0 0 57 57 54 57 0 45 54 45 0 0 57 48 0 57 60 51 0 63 63 60 63 63 63 69 57 63 66 72 0 66 60 0 48 60 0 66 0 63 57 63 66 63 51 57 48 57 63 57 66 60 66 60 63 60 63 60 63 57 48 0 0 0 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 1.171875 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 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 -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 1.171875 1.171875 1.171875 -1.953125 0.390625 2.734375 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.4 3.45 3.5 3.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
96.789 98.449 100.721 104.470
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="36">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 105.000 106.667 108.333 110.000 111.667 113.333 115.000 116.667 118.333 120.000 121.667 123.333 125.000 126.667 128.333 130.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 123.889 122.778 121.667 120.556 119.444 118.333 117.222 116.111 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 57 0 0 0 0 0 0 0 0 0 0 0 0 0 0 48 45 54 54 54 51 0 0 48 48 0 0 0 57 0 54 0 0 48 63
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -2.734375 2.734375 1.171875 1.953125 1.953125 0.390625 1.171875 0.390625 -1.171875 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 -1.953125 0.390625 0.390625 -0.390625 -0.390625 1.171875 0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
88.045 90.0 93.262 94.778 95.0 96.295 97.811 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 303.128 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.741 3.56 3.431 3.431 3.431 3.56 3.656 3.862 4.053 4.23 4.399 4.559 4.714 4.864 5.01 5.154 5.296 5.436 5.575 5.714 5.853 5.991 6.131 6.271 6.412 6.555 6.7 6.846 6.994 7.145 7.299 7.456 7.616 7.78 7.947 8.118 8.293 8.471 8.652 8.836 9.02 9.201 9.376 9.537 9.675 9.78 9.839 9.85 9.849 9.84 9.821 9.793 9.756 9.711 9.657 9.597 9.529 9.455 9.375 9.29 9.199 9.104 9.005 8.902 8.796 8.686 8.574 8.459 8.342 8.223 8.103 7.982 7.859 7.736 7.612 7.488 7.363 7.239 7.114 6.99 6.867 6.744 6.621 6.5 6.379 6.259 6.141 6.023 5.907 5.792 5.679 5.566 5.456 5.346 5.239 5.132 5.028 4.925 4.823 4.723 4.625 4.528 4.433 4.339 4.248 4.157 4.069 3.982 3.896 3.813 3.73 3.65 3.57 3.493 3.417 3.342 3.269 3.197 3.127 3.058 2.991 2.924 2.86 2.796 2.734 2.674 2.614 2.556 2.499 2.443 2.388 2.335 2.283 2.231 2.181 2.132 2.084 2.037 1.992 1.947 1.903 1.86 1.818 1.777 1.737 1.697 1.659 1.621 1.585 1.549 1.514 1.479 1.446 1.413 1.381 1.35 1.319 1.289 1.26 1.231 1.203 1.176 1.149 1.123 1.097 1.072 1.048 1.024 1.001 0.978 0.955 0.934 0.912 0.892 0.871 0.851 0.832 0.813 0.794 0.776 0.759 0.741 0.724 0.708 0.692 0.676 0.66 0.645

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.56" PeakHeight="93.262" Num="3" Error="0.389">
-7.776 3.384 -0.825
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.56" EndFrequency="9.85" PeakHeight="303.128" Num="5" zHalfNm="209.016" Error="2.821">
-166.632 -56.424 17.151 1.558 -0.97
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.549" Depth="0.129"/>
<TopsideChapman PeakHeight="303.128" PeakDensity="1203753.1" PeakScaleHeight="67.535" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
