Solar Trans-equatorial Activity

Wang, Jingxiu; Zhang, Yuzong; Zhou, Guiping; Harra, L. K.; Williams, David R.; Jiang, Yong

doi:10.1007/s11207-007-9038-y

Cited by 32 publications

(24 citation statements)

References 53 publications

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“…Zhukov and Veselovsky (2007) suggest a concept of global CMEs to describe observations of widespan CMEs whose source regions are truly global in nature. Activity with large spatial scale have been clearly shown in trans-equatorial magnetic structures (Harra et al 2003Wang et al 2006Wang et al , 2007.…”

Section: Discussionmentioning

confidence: 99%

“…8 of Wang et al 2007). Often, a TEL is growing and flaring, coupled with major flare or flares in AR 10696, during which the associated CME was accelerating.…”

Section: On the Events In Early November Of 2004mentioning

confidence: 97%

“…The energy release rate of a TEL is much lower than that of a major flare in the AR, but their lifetime was longer than 15 hours (see Figs. 3 and 11 of Wang et al 2007). Jiang et al (2007) have revealed from a theoretical approach that TELs are visible signatures of poloidal field lines across the equator in Babcock-Lighton dynamo process, and an intrinsic component of solar magnetism in solar cycle.…”

Section: On the Events In Early November Of 2004mentioning

confidence: 99%

“…3 and 11 of Wang et al 2007). Jiang et al (2007) have revealed from a theoretical approach that TELs are visible signatures of poloidal field lines across the equator in Babcock-Lighton dynamo process, and an intrinsic component of solar magnetism in solar cycle. However, as an AR not always produces flares, only episodic flaring happens in some TELs.…”

Section: On the Events In Early November Of 2004mentioning

confidence: 99%

“…As summarized by these authors, some recent studies suggest that those CMEs are inherently in large-scale, so that their energy supply and final angular width originate from a large-scale region (see Wen et al 2007;Wang et al, 2007;Zhou et al 2007;Zhukov and Veselovsky, 2007); while, other approaches consider that CMEs start from AR scale, and then evolve to become large-scale even in the low corona due to interaction between the expanding magnetic structure of the CMEs and other lowcoronal magnetic structures (see Maia et al, 1999;Pohjolainen et al, 2001;Bemporad et al, 2005;Attrill et al, 2007a;Mandrini et al, 2007;Moore and Sterling, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Is there more global solar activity on the Sun?

Wang¹,

Zhang²,

Zhou³

et al. 2009

Proc. IAU

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Abstract. There appear indications of more global activity on the Sun which is larger, much beyond the scale of solar active regions (ARs). These indications include formation, flaring and eruption of the trans-equatorial loops seen in EUV and X-rays, formation and eruption of transequatorial filaments, global magnetic connectivity in EUV dimming associated with halo-coronal mass ejections, wide spread of radio burst sources in meter wavelength in the solar corona, and quasi-simultaneous magnetic flux emergence in both hemispheres seen during some major solar events. With examples of a few major events in the last solar cycle we discuss the possibility that there is large or global-scale activity on the Sun. Its spatial scale is many times larger than that of AR and temporal scale is over 10 hours. The exemplified trans-equatorial loops are anchored in ARs and their activity is temporally associated with flares in ARs too. In some sense the flares in ARs appear either as a part of or a precursor of the more global activity. It is likely that the combination of the flares in ARs and the associated global activity is responsible to the major solar-terrestrial events. More efforts in understanding the global activity are undertaken.

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Section: Discussionmentioning

confidence: 99%

“…8 of Wang et al 2007). Often, a TEL is growing and flaring, coupled with major flare or flares in AR 10696, during which the associated CME was accelerating.…”

Section: On the Events In Early November Of 2004mentioning

confidence: 97%

Section: On the Events In Early November Of 2004mentioning

confidence: 99%

Section: On the Events In Early November Of 2004mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Is there more global solar activity on the Sun?

Wang¹,

Zhang²,

Zhou³

et al. 2009

Proc. IAU

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The Sun – Earth Workshop: A Summary of the Outcome

Culhane¹,

2007

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This special issue includes a set of papers that deal with extended solar activity, the launching of CMEs at the Sun, their propagation through interplanetary space, and the detection and study of the ejecta near Earth and of their interaction with the Earth's magnetic environment. In particular solar events that occurred on the related shocks arrived at Earth about two days later, are considered. The summary paper extracts the principal outcomes that were arrived at in the areas treated during the workshop and seeks to draw conclusions both on the progress made and on possible directions for future work in these areas.

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Influence of Magnetic Clouds on Variations of Cosmic Rays in November 2004

Lü

et al. 2010

Sol Phys

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We investigate the effects of two magnetic clouds on hourly cosmic-ray intensity profiles in the Forbush decrease events in November 2004 observed by 47 ground-based neutron-monitor stations. By using a wavelet decomposition, the start time of the main phase in a Forbush decrease event can be defined, and then clearer definitions of initial phase, main phase, and recovery phase are proposed. Our analyses suggest that the main phase of this Fd event precedes the arrival time of the first magnetic cloud by about three hours, and the Fds observed at the majority (39/47) of the stations were found to originate from the sheath region as indicated by large fluctuations in magnetic field vectors at 19:00 UT on 7 November 2004, regardless of the station location. In addition, about 45% of the onset times of the recovery phase in the Forbush decreases took place at 04:00 UT on 10 November, independent of the station position. The results presented here support the hypothesis that the sheath region between the shock and the magnetic cloud, especially the enhanced turbulent magnetic field, results in the scattering of cosmic-ray particles, and causes the following Forbush decreases. Analysis of variation profiles from different neutron monitors reveals the global simultaneity of this Forbush decrease event. Moreover, we infer that the interplanetary disturbance was asymmetric when it reached the Earth, inclined to the southern hemisphere. These results provide several observational constraints for more detailed simulations of the Forbush decrease events with time-dependent cosmic-ray modulation models.

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Solar Trans-equatorial Activity

Cited by 32 publications

References 53 publications

Is there more global solar activity on the Sun?

Is there more global solar activity on the Sun?

The Sun – Earth Workshop: A Summary of the Outcome

Influence of Magnetic Clouds on Variations of Cosmic Rays in November 2004

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