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Text
Stream Interaction Regions (SIRs) from Wind and ACE Data during 1995 − 2009
ResourceID
spase://NASA/Catalog/Wind/SIR_List
Description
The SIR include corotating interaction regions (CIRs) and tranisent stream interaction regions. The difference between a CIR and a transient SIR is only that a CIR recurs for two or more solar rotation cycles.
The SIRs are identified based on inspection of the following features: an increase of solar wind speed, a pile-up of total perpendicular pressure (Pt) with gradual decreases at both sides from the Pt peak to the edges of the interaction region, velocity deflections, an increase of proton number density, an
enhancement of proton temperature, an increase of entropy, a compression of magnetic field. We require the presence of at least 5 signatures, and identify SIRs with careful consideration of the ambient solar wind.
In order to survey the SIRs as completely as possible, we have used ACE data when the Wind data were unavailable or noisy and when Wind was near or within the magnetosphere.
1. Jian et al (Solar Physics, 239, 337-392, doi: 10.1007/s11207-006-0132-3, 2006) gives more details about the identification criteria and also the SIR list of 1995 – 2004.
2. The SIR list of 1995 – 2006 is an appendix of Lan Jian's 2008 PhD thesis from UCLA.
3. Jian et al. (Solar Physics, 274, 321-344, doi: 10.1007/s11207-011-9737-2, 2011) updates the results to 2009.
4. The solar cycle variation from 1995 to 2011 is published in Jian et al. (Amer. Inst. Phys. Proceedings of Solar Wind 13, 1539, 195-198, doi: 10.1063/1.4811021, 2013), where STEREO A/B is used for 1-AU observation beyond 2009.
Metadata Rights
CC0-1.0:
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license.
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Details
Version:2.7.1
Catalog
ResourceID
spase://NASA/Catalog/Wind/SIR_List
NamingAuthority
NASA
ResourceType
Catalog
ResourceHeader
ResourceName
Stream Interaction Regions (SIRs) from Wind and ACE Data during 1995 − 2009
ReleaseDate
2026-02-02 13:10:27Z
RevisionHistory
RevisionEvent
ReleaseDate
2025-03-25 14:43:15
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2026-02-02 13:10:27Z
Note
Added MetadataRightsList. Updated to 2.7.1. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. ZCB
Description
The SIR include corotating interaction regions (CIRs) and tranisent stream interaction regions. The difference between a CIR and a transient SIR is only that a CIR recurs for two or more solar rotation cycles.
The SIRs are identified based on inspection of the following features: an increase of solar wind speed, a pile-up of total perpendicular pressure (Pt) with gradual decreases at both sides from the Pt peak to the edges of the interaction region, velocity deflections, an increase of proton number density, an
enhancement of proton temperature, an increase of entropy, a compression of magnetic field. We require the presence of at least 5 signatures, and identify SIRs with careful consideration of the ambient solar wind.
In order to survey the SIRs as completely as possible, we have used ACE data when the Wind data were unavailable or noisy and when Wind was near or within the magnetosphere.
1. Jian et al (Solar Physics, 239, 337-392, doi: 10.1007/s11207-006-0132-3, 2006) gives more details about the identification criteria and also the SIR list of 1995 – 2004.
2. The SIR list of 1995 – 2006 is an appendix of Lan Jian's 2008 PhD thesis from UCLA.
3. Jian et al. (Solar Physics, 274, 321-344, doi: 10.1007/s11207-011-9737-2, 2011) updates the results to 2009.
4. The solar cycle variation from 1995 to 2011 is published in Jian et al. (Amer. Inst. Phys. Proceedings of Solar Wind 13, 1539, 195-198, doi: 10.1063/1.4811021, 2013), where STEREO A/B is used for 1-AU observation beyond 2009.
Contacts
Role
Person
StartDate
StopDate
Note
1.
AuthorGeneralContact
spase://SMWG/Person/Lan.Jian
2.
MetadataContact
spase://SMWG/Person/Olga.Y.Uritskaya
AccessInformation
RepositoryID
spase://SMWG/Repository/ACE_SC
AccessURL
URL
https://izw1.caltech.edu/ACE/ASC/DATA/level3/SIR_List_1995_2009_Jian.pdf
Format
Text
InstrumentIDs
spase://SMWG/Instrument/ACE/MAG
spase://SMWG/Instrument/Wind/MFI
PhenomenonType
StreamInteractionRegion
TimeSpan
StartDate
1995-01-01 19:37:00
StopDate
2009-12-25 06:00:00
Parameter #1
Name
SIR #
Support
SupportQuantity
Other
Parameter #2
Name
CIR #
Support
SupportQuantity
Other
Parameter #3
Name
Start
Units
UT [mm/dd hhmm]
Support
SupportQuantity
Temporal
Parameter #4
Name
End
Units
UT [mm/dd hhmm]
Support
SupportQuantity
Temporal
Parameter #5
Name
Discontinuity
Units
UT [mm/dd hhmm]
Support
SupportQuantity
Temporal
Parameter #6
Name
F/R Shock
Description
F/R Shock: forward/reverse shock. "/" means neither a forward shock nor a reverse shock
Support
SupportQuantity
Other
Parameter #7
Name
Stream Interface (SI)
Units
UT [mm/dd hhmm]
Support
SupportQuantity
Temporal
Parameter #8
Name
Ptmax
Units
Ppa
Support
SupportQuantity
Other
Parameter #9
Name
Vmax
Units
km/s
Support
SupportQuantity
Velocity
Parameter #10
Name
Vmin
Units
km/s
Support
SupportQuantity
Velocity
Parameter #11
Name
ΔV
Description
ΔV: change in solar wind velocity magnitude during one event.
Units
km/s
Support
SupportQuantity
Velocity
Parameter #12
Name
Bmax
Units
nT
Support
SupportQuantity
Other
Parameter #13
Name
Comments
Support
SupportQuantity
Remark