international standardization organization technical specification 15391 space environment (natural...
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INTERNATIONAL STANDARDIZATION ORGANIZATIONINTERNATIONAL STANDARDIZATION ORGANIZATIONTECHNICAL SPECIFICATION 15391TECHNICAL SPECIFICATION 15391
Space Environment Space Environment
(Natural and Artificial)(Natural and Artificial)Probabilistic model of fluences and peak Probabilistic model of fluences and peak
fluxes of solar energetic particlesfluxes of solar energetic particles
Part I ProtonsPart I Protons
(Version 2004)(Version 2004)
by by R.A. Nymmik R.A. Nymmik
ISO WG 4, Moscow 2004 ISO WG 4, Moscow 2004 R.A.NymmikR.A.Nymmik
The present Standard is intended for calculating The present Standard is intended for calculating the fluences and peak fluxes of solar energetic the fluences and peak fluxes of solar energetic protons, which are expected to occur during a protons, which are expected to occur during a given time interval at any known or predicted given time interval at any known or predicted
solar activity level and to exceed their calculated solar activity level and to exceed their calculated sizes with a given probability. sizes with a given probability.
In combination with the ISO 15390 Standard – In combination with the ISO 15390 Standard – Model of Galactic Cosmic rays, this Standard Model of Galactic Cosmic rays, this Standard
provides a description of the radiation provides a description of the radiation environment, induced by high-energy particle environment, induced by high-energy particle
fluxes on the Earth’s orbit in interplanetary space fluxes on the Earth’s orbit in interplanetary space and serves as the basis for describing the and serves as the basis for describing the
radiation environment during interplanetary radiation environment during interplanetary missions, and for calculating particle fluxes, missions, and for calculating particle fluxes,
penetrating into near-Earth spacecraft and space penetrating into near-Earth spacecraft and space station orbits. station orbits.
ISO WG 4, Moscow 2004ISO WG 4, Moscow 2004
SEP flux model - version 2004 SEP flux model - version 2004 is the MSU model,is the MSU model,
corrected according to the results corrected according to the results of study of the systematical of study of the systematical errors and reliability of the errors and reliability of the
different Solar Energetic protons different Solar Energetic protons flux data, measured on different flux data, measured on different
spacecrafts by different spacecrafts by different instruments.instruments.
R.A.NymmikR.A.Nymmik
ISO WG 4, Moscow 2004ISO WG 4, Moscow 2004
Some examples of systematic errors in Some examples of systematic errors in the measurement resultsthe measurement results
A convenient technique of multiple A convenient technique of multiple analysis of SEP events fluxes and analysis of SEP events fluxes and energy spectra is the logarithmic energy spectra is the logarithmic
mean of a set of events:mean of a set of events:
R.A.NymmikR.A.Nymmik
n
ii EF
nEF 1
lg1
10
ISO WG 4, Moscow 2004 ISO WG 4, Moscow 2004 R.A.NymmikR.A.Nymmik
An example of systematic errors in the An example of systematic errors in the measurement resultsmeasurement results
The ratio of the sizes of
the SEP events peak
fluxes , measured on
the IMP-8 and GOES-7 spacecrafts
versus energy
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
The distribution of peak flux
ratios for the SEP events,
recorded by GOES-6 and
GOES-7 measurement
channels.
An example of systematic errors in the An example of systematic errors in the measurement resultsmeasurement results
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
An example of systematic errors in the measurement resultsAn example of systematic errors in the measurement results
The channel 10 of CPME insrument on The channel 10 of CPME insrument on IMP-8IMP-8
ISO WG 4, Moscow 2004ISO WG 4, Moscow 2004
The distribution The distribution functions for the functions for the SEP events which SEP events which occurred during occurred during 1986-2002 1986-2002 according to IMP-according to IMP-8 and GOES-7&8 8 and GOES-7&8 spacecrafts spacecrafts measurements of measurements of EE30 and E30 and E300 300 MeV proton MeV proton fluxes and their fluxes and their approximationsapproximations
R.A.NymmikR.A.Nymmik
An example of systematic errors in the An example of systematic errors in the measurement resultsmeasurement results
ISO WG 4, Moscow 2004ISO WG 4, Moscow 2004
..
R.A.NymmikR.A.Nymmik
Reliability of the different measurement data
13 GLE events of 22 cycle
Coincide:1.GOES-7 (uncorrected)2.METEOR 3.Neutron monitors Differ:1.IMP-82. GOES-7 (corrected)
ISO WG 4, Moscow 2004ISO WG 4, Moscow 2004
Main errors of theMain errors of the JPL-91JPL-91 (Feynman et al.) and (Feynman et al.) and ESPESP (Xapsos et al.) models (Xapsos et al.) models1. Neglecting the SEP fluxes in the 1. Neglecting the SEP fluxes in the
“Quiet” Sun“Quiet” Sun period (W<40) period (W<40)
2. Assumption that SEP event 2. Assumption that SEP event frequency and flux sizes are the frequency and flux sizes are the same for the whole same for the whole “Active” “Active” SunSun (W>40)period (W>40)period
R.A.NymmikR.A.Nymmik
ISO WG 4, Moscow 2004 ISO WG 4, Moscow 2004 R.A.NymmikR.A.Nymmik
The proton fluence for SEP events (circles)
and GCR (asterisks)
during the last SA minimum,
covering the 4-year period
from Dec. 1993 to Nov. 1997. The energy spectra are differential.
Neglecting the SEP fluxes in the “Quiet” Neglecting the SEP fluxes in the “Quiet” Sun period (W<40)Sun period (W<40)
ISO WG 4, Moscow 2004 ISO WG 4, Moscow 2004 R.A.NymmikR.A.Nymmik
The logarithmicaly averaged annual proton fluence energy spectra
measured by GOES (for years with solar activity W>100 and
40<W<100). JPL-91 model interprets
these fluences as detected with different
probability(from 0.1 o 0.7), instead of as caused by different
SA!
Assumption that SEP event frequency andAssumption that SEP event frequency and flux sizes are the same for the whole flux sizes are the same for the whole
““Active” Sun (W>40)periodActive” Sun (W>40)period
ISO WG 4, Moscow 2004 ISO WG 4, Moscow 2004 R.A.NymmikR.A.Nymmik
Another methodological shortcomings of Another methodological shortcomings of the the JPL-91JPL-91 and and ESPESP models are: models are:
1. the nonphysical (“engineering” or “commercial”) definition of the “SEP event”,
2. use of partially unreliable databases
3. the non-optimal methods for analysing SEP – SA connection,4. the limited technique of the separate
distribution functions for different energy particle fluxes and fluences,
5. the irrelevant form of distribution function used in JPL-91 model.
The basic The basic physical regularitiesphysical regularities of MSU of MSU SEP fluxes probabilistic model SEP fluxes probabilistic model
establishedestablished1. The SEP event frequency is proportional to 1. The SEP event frequency is proportional to
solar activity (SA)solar activity (SA)
2. The SEP event distribution function is power 2. The SEP event distribution function is power law with a turn-off at high fluxes (fluences)law with a turn-off at high fluxes (fluences)
3. The SEP event distribution function is 3. The SEP event distribution function is invariant relative to SAinvariant relative to SA
4. The SEP energy spectrum at E>30 MeV is 4. The SEP energy spectrum at E>30 MeV is power law of the particle momentum per power law of the particle momentum per nucleon (rigidity for protons)nucleon (rigidity for protons)
5. Some aditional regularities of the SEP 5. Some aditional regularities of the SEP particle energy spectra parameters.particle energy spectra parameters.
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
The event The event frequency is frequency is
proportional to proportional to the smoothed the smoothed
sunspot number sunspot number on the day of on the day of
the event the event generation.generation.
Dashed line is Dashed line is the the
dependence, dependence, used in JPL-91 used in JPL-91
modelmodel..
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
The dependence of the SEP event The dependence of the SEP event occurrence frequency on the solar activity occurrence frequency on the solar activity
levellevel
circles circles – the – the experimental experimental data, data,
and and approximations approximations used in: used in:
MSUMSU (solid), (solid), JPL-91JPL-91 (dashed) (dashed)
and and ESP ESP (pointed) (pointed)
modelsmodels..
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
Distribution functions of the SEP events Distribution functions of the SEP events for Efor E30 proton fluences:30 proton fluences:
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
Distribution functions for SEP events at SA periods of W<80 and W>80. Left: the unnormalized functions. Right: the functions, normalized to sum of Wolf numbers in the measurement period
The markers denote: The markers denote: METEOR METEOR data data
(circles), (circles), GOES GOES data data (squares), (squares), II
MP-8MP-8 (black squares), (black squares), balloon balloon data data
(triangles), and (triangles), and neutron monitorneutron monitor data data
(black circles). (black circles). The energy spectra The energy spectra
are shown as are shown as power-power-law functions of law functions of
momentummomentum (rigidity) (rigidity) (curve 1) and (curve 1) and energy energy
(curve 2), (curve 2), rigidity rigidity exponentexponent (curve 3). (curve 3).
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
The integral proton peak fluxes of the 21 The integral proton peak fluxes of the 21 May 1990 SEP event.May 1990 SEP event.
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
The dependence of the spectral indexes on the SEP event size
Version 3 based on the mixed data of IMP, GOES, Meteor
spacecrafts.Version 2004 based
on the GOES spacecrafts most
reliable (uncorrected) data
only
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
VersionsVersions ФФoo
PreviousPrevious 1.411.41 4.54.5
10**910**9
20042004 1.321.32 9.09.010**910**9
The distribution functions of MSU model previous and 2004 versions
o
30exp
)(
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
Model output data requirementsModel output data requirements
The model output data should satisfy The model output data should satisfy the only basic requirement:the only basic requirement:
– – they should adequately describe the they should adequately describe the experimental data on the SEP particle experimental data on the SEP particle
fluxes (and not contradict them), fluxes (and not contradict them),
corresponding to a space mission with corresponding to a space mission with any durationany duration
at any level of solar activityat any level of solar activity
ISO WG4, Moscow 2004 R.A.NymmikISO WG4, Moscow 2004 R.A.Nymmik
MSU ModelMSU Model JPL-91 and ESPJPL-91 and ESP modelsmodels
SEP particles
are neglected
Solar proton fluences 1994-1997
MSU ModelMSU Model JPL-91 and ESPJPL-91 and ESP modelsmodels
SEP particles
are neglecte
d
Solar proton peak fluxes 1994-1997
ISO WG 4, Moscow 2004 ISO WG 4, Moscow 2004 R.A.NymmikR.A.Nymmik
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
Annual solar proton fluence spectra for years with 100<W<150
MSU ModelMSU Model JPL-91 modelJPL-91 model
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
22 and 23 SA cycle data and model outputs
MSU ModelMSU Model JPL-91 modelJPL-91 model
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
22 and 23 SA cycle data and model outputs
MSU model The King, JPL-91 and JPL-91 improved in SPENVIS
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
Solar proton annual peak fluxes for years with SA 100<W<150
Experimental data for years:
1989, 2000 and 2003 are
demonstrated.MSU model outputs are
valid from 4 to 10000 MeVThere are
published data in the ESP
model for 10 MeV only
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
As it is seen from above, the MSU SEP flux As it is seen from above, the MSU SEP flux model (proton fluences and peak flux) model (proton fluences and peak flux) reliably describes the experimental data reliably describes the experimental data for:for: any solar activity conditions and any solar activity conditions and
any space mission durationany space mission duration for proton energies ≥4 MeVfor proton energies ≥4 MeV (high energies (high energies
are not limited).are not limited). In our opinionIn our opinion such efficiency of the semi-empirical model such efficiency of the semi-empirical model
is achieved primarily due to the account foris achieved primarily due to the account for fundamental regularities inherent to solar fundamental regularities inherent to solar energetic particle events and fluxesenergetic particle events and fluxes and and cannot be achieved by the empirical cannot be achieved by the empirical methodology,methodology, used in the development of used in the development of JPL-91 and ESP models.JPL-91 and ESP models.
The calculations by the model are The calculations by the model are available for everybody on the Web-site:available for everybody on the Web-site:
On this Web-site you can read also the On this Web-site you can read also the Technical SpecificationTechnical Specification andand the Memorandum (90 pages). the Memorandum (90 pages). All this documents are sent to the ISO All this documents are sent to the ISO
WG-4 referents WG-4 referents (see the resolution(see the resolution No No 166)166)
http/srd.sinp.msu.ru/models/sep2004.html
ISO WG 4, Moscow 2004 R.A.NymmikISO WG 4, Moscow 2004 R.A.Nymmik
This version of the This version of the ISO Technical ISO Technical SpecificationSpecification is prepared according to the is prepared according to the International Standard OrganizationInternational Standard Organization Technical Committee 20 (Aircraft and Technical Committee 20 (Aircraft and space vehicles), Subcommittee SC 14, space vehicles), Subcommittee SC 14, (Space systems and operations) Working (Space systems and operations) Working Group 4 (Space Environment) Group 4 (Space Environment) 18th18th - - meeting meeting (Toulouse, France, September, (Toulouse, France, September, 2003) 2003) resolutionresolution No 166 No 166. .
The work was supported by INTAS grant No. The work was supported by INTAS grant No. 00-629.00-629.
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