operational solar irradiances for muri
DESCRIPTION
Operational solar irradiances for MURI. MURI Workshop October 21-22, 2008 W. Kent Tobiska [email protected] Space Environment Technologies. Overview. - PowerPoint PPT PresentationTRANSCRIPT
SET Operations
1http://SpaceWx.com
Operational solar irradiances for MURI
MURI WorkshopOctober 21-22, 2008W. Kent Tobiska
1-310-573-4185 [email protected] Environment Technologies
SET Operations
2http://SpaceWx.com
OverviewA. JB2008 solar indices contributions to nighttime
minimum exospheric temperature from daily change relative to 81-day value
1. S10 (74.1%) - created by SET/APEX from SOHO SEM 26-34 nm bandpass and used with 1-day lag
2. M10 (10.2%) - created by SET/S2KOPS from NOAA 16/17, SORCE, GOME MgII cwr and used with 2-day lag
3. F10 (9.8%) - observed by Penticton and used with 1-day lag
4. Y10 (5.8%) - created by SET/S2KOPS from MgII/Lyman-alpha/GOES XRS and used with 5-day lag
B. Other solar datasets and models
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JB2008 websitehttp://sol.spacenvironment.net/
~JB2008/
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The JB2008 solar indices
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The JB2008 solar indicesF10
Max = 284.500 Min = 65.0000
Mean = 122.429 +/- 47.5474 1-sigma Ratio max:min = 4.37692
S10Max = 235.400 Min = 56.3000
Mean = 122.191 +/- 45.4857 1-sigma Ratio max:min = 4.18117
M10Max = 243.400 Min = 60.1000
Mean = 121.046 +/- 44.0598 1-sigma Ratio max:min = 4.04992
Y10Max = 195.020 Min = 45.8300
Mean = 104.612 +/- 36.4647 1-sigma Ratio max:min = 4.25529
SET Operations
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Motivation for new Y10 solar index … capture the X-ray & Ly absorption in
lower thermosphereAltitude of Maximum Rate of Absorption of Solar UV Radiation
0
50
100
150
200
250
0 50 100 150 200 250 300 350
Wavelength (nm)
Altitude (km)
O2 , N2 , O
Ly alpha
O2
O3
EUV
Schmann-Runge Continuum Hartley Bands
FUV MUV
Altitude of Maximum Rate of Absorption of Solar UV Radiation
0
50
100
150
200
250
0 50 100 150 200 250 300 350
Wavelength (nm)
Altitude (km)
O2 , N2 , O
Ly alpha
O2
O3
EUV
Schmann-Runge Continuum Hartley Bands
FUV MUV
Seuv
Xb10 & Lya
Esrc
Lya
Ehrt
MgII
Altitude of unit optical depth for UV absorption
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Creating Y10: start with GOES 0.1-0.8 nm soft X-
rays
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Separate background (Xb10 = X10) and flare (Xhf)
indices
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Make solar cycle adjustment to Lyman-alpha (~L10)
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Form SET Lyman-alpha composite
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Combine L10 and X10 to form Y10
L10, X10, Y10
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The formation of Y10 L10 is the SET composite Lyman-alpha FUV emission reported in sfu units after linear regression with F10
X10 is the SET Xb10 X-ray background component reported in sfu units after linear regression with F10
F81norm is the normalized 81-day smooth of F10
Y10 = F81norm*(X10) + (1-F81norm)*(L10)
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The result – JB2008 densities
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Existing data links for SET data products and those
of other organizations using coupled
solar irradianceshttp://spacewx.com Products quicklink
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SIP PG provides
historical, nowcast, and operational
forecast XUV-UV variability in several spectral
and proxy formats, including
JB2006/JB2008 indices, using the IDL Virtual Machine that runs on any platform
SIP SY provides callable IDL routine for MURI models
Solar Irradiance Platform v2.34