Geoeffectiveness of stream interaction regions during 2007–2008

Sanchez-Garcia, E.; Aguilar-Rodríguez, E.; Ontiveros, Veronica; González-Esparza, A.

doi:10.1002/2016sw001559

Cited by 6 publications

(5 citation statements)

References 67 publications

(102 reference statements)

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“…In cycle 24, 17 SIRs (28%) caused a GS. As expected from previous studies, the GSs associated with the SIR events were minor or moderate (Chi et al., 2018; Sanchez‐Garcia et al., 2017). Figure 7b shows the histogram of GSs generated by the SIRs according to the Dst index.…”

Section: Resultssupporting

confidence: 86%

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Stream Interaction Regions in the Minimum of Solar Cycles 23 and 24

Sanchez‐Garcia,

Gonzalez‐Esparza,

Aguilar‐Rodriguez

et al. 2023

JGR Space Physics

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Stream interaction regions (SIRs) dominate the large‐scale solar wind dynamics during the minimum of the solar cycle. The interaction of SIRs with the magnetosphere causes most of geomagnetic storms during this epoch. We used in‐situ solar wind observations at 1 AU to study 62 SIRs detected in the interval 2007–2008 (minimum of cycle 23) and 61 SIRs in the interval 2018–2019 (minimum of cycle 24). We compared distinct characteristics of SIRs, such as the solar wind streams velocities, the presence of forward and/or reverse shocks (RS), SIR radial widths, the relative position of the stream interface within the SIRs, SIR latitudinal orientation, and the geoeffectiveness. There were more geomagnetic storms driven by SIRs in cycle 23 than in cycle 24. The pattern of fast solar wind streams in cycle 23 tended to be faster than in cycle 24. We found more SIRs with RS in cycle 23 than in cycle 24. For the geoeffective SIRs, the momentum flows from the fast solar wind to the slow solar wind, as well as their stream interface is closer to the SIR front. Coronal holes associated with SIRs registered in cycle 23 tended to be wider in longitude near the solar equator and/or at midlatitudes. We did not find a clear relation between the geoeffectiveness of the SIRs and their latitudinal inclinations.

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Section: Resultssupporting

confidence: 86%

“…B z is an essential signature in forecasting a geomagnetic response (Richardson, 2018). The level of geomagnetic activity is also correlated with the high‐speed stream and tends to be stronger during the disturbed fast SW (Richardson, 2018; Sanchez‐Garcia et al., 2017; Verbanac et al., 2013).…”

Section: Introductionmentioning

confidence: 99%

Stream Interaction Regions in the Minimum of Solar Cycles 23 and 24

Sanchez‐Garcia,

Gonzalez‐Esparza,

Aguilar‐Rodriguez

et al. 2023

JGR Space Physics

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“…SIRs are thought to be the major drivers of moderate geomagnetic storms (e.g., Echer et al, ; Shen et al, ; Zhang et al, , and references therein). From another point of view, the geoeffectiveness of SIRs has also been widely studied by different authors (e.g., Alves et al, ; Kilpua et al, ; Lockwood et al, ; Sanchez‐Garcia et al, ; Zhang et al, ). Using solar wind observations during the period from 1964 to 2003, Alves et al () found that 33% of SIRs were followed by moderate/intense magnetic activity ( D s t ≤−50 nT).…”

Section: Introductionmentioning

confidence: 99%

“…They further suggested that SIRs had a greater geomagnetic effect than expected. Sanchez‐Garcia et al () studied the geoeffectiveness of SIRs during 2007 and 2008. They found that the percentage of SIRs causing geomagnetic storms was 50%, 55%, and 90% using the criteria of the aa, Kp, and equivalent symmetric disturbance component in H (SYM‐H) indices, respectively.…”

Section: Introductionmentioning

confidence: 99%

Geoeffectiveness of Stream Interaction Regions From 1995 to 2016

et al. 2018

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Stream interaction regions (SIRs) are important sources of geomagnetic storms. In this work, we first extend the end time of the widely used SIR catalog developed by Jian et al. (2006, https://doi.org/10.1007/s11207-006-0132-3), which covered the period from 1995 to 2009, to the end of 2016. Based on this extended SIR catalog, the geoeffectiveness of SIRs is discussed in detail. It was found that 52% of the SIRs caused geomagnetic storms with Dstmin ≤−30 nT, but only 3% of them caused intense geomagnetic storms with Dstmin ≤−100 nT. Furthermore, we found that 10 of the intense geomagnetic storms caused by SIRs were associated with complex structures due to interactions between SIRs and interplanetary coronal mass ejections (ICMEs). In such a structure, an ICME is embedded in the SIR and located between the slow and fast solar wind streams. In addition, we found that the geoeffectiveness of SIRs interacting with ICMEs is enhanced. The possibility of SIR‐ICME interaction structures causing geomagnetic storms is markedly higher than that of isolated SIRs or isolated ICMEs. In particular, the geoeffectiveness of SIR‐ICME interaction structures is similar to that of the Shock‐ICME interaction structures, which have been demonstrated to be the main causes of geomagnetic storms.

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“…CMEs drastically disturb the cosmic ray (CR) intensity (CRI; e.g., Cane, ; Oh et al, ; Venkatesan & Badruddin, ; G. Zhang & Burlaga, ). They cause large disturbances in geomagnetic activity (e.g., Kamide et al, ; Yermolaev et al, ; J. Zhang et al, ) and are responsible for other space weather effects (e.g., Kudela et al, ; Sanchez‐Garcia et al, , and references therein). Periods, when several solar flares occur and CMEs (especially halo CMEs) are ejected from the Sun subsequently and travel in the interplanetary space, are of special interest for the study of the evolution and effects of disturbances in the heliosphere and magnetosphere.…”

Section: Introductionmentioning

confidence: 99%

Forbush Decreases and Geomagnetic Storms During a Highly Disturbed Solar and Interplanetary Period, 4–10 September 2017

et al. 2019

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Features and peculiarities of the cosmic ray intensity (CRI) and the geomagnetic activity, along with several solar plasma and interplanetary magnetic field, during the period 4-10 September 2017 are studied. The period was characterized by strong solar activity: Several solar flares occurred; several halo coronal mass ejections (CMEs) were ejected in space. In the near-Earth interplanetary space, the CMEs driving shock(s) and sheath(s) were identified. At the Earth, strong Forbush decreases in CRI and geomagnetic storms were observed. Several large solar flares, one of them of very high X-ray importance (X9.3) and three halo CMEs were detected in the solar atmosphere. Two shock-associated interplanetary CMEs were observed during that interval in near-Earth space; the latter and faster one arrived even as the ejecta of the earlier one was still crossing. Variations in interplanetary plasma and field parameters during, before, and after the Forbush decreases and geomagnetic storms that occurred during the considered period were examined. A detailed time-lagged correlation analysis using data at three different temporal resolutions (hourly, 5-min, and 1-min) was also performed. Cross correlations of time series of CRI with geomagnetic activity during the period 4-10 September 2017 are computed. This cross-correlation analysis between CRI variability (defined as the difference of the CRI count rate between the current and the previous time step) and the Dst indicates a delay of Dst by 3-4 hr.

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Geoeffectiveness of stream interaction regions during 2007–2008

Cited by 6 publications

References 67 publications

Stream Interaction Regions in the Minimum of Solar Cycles 23 and 24

Stream Interaction Regions in the Minimum of Solar Cycles 23 and 24

Geoeffectiveness of Stream Interaction Regions From 1995 to 2016

Forbush Decreases and Geomagnetic Storms During a Highly Disturbed Solar and Interplanetary Period, 4–10 September 2017

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