Cosmic-ray anisotropy and density near the neutral sheet of the interplanetary magnetic field

Krymsky, G. F.; Krivoshapkin, P. A.; Gerasimova, S. K.; Gololobov, P. Yu.

doi:10.1134/s1063773712080038

Cited by 7 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nonsimultaneity of FD events might be not directly about shifting the onset, but this shifting might reveal in the cosmic ray anisotropy; in other words, this might be a result of particle shifting in the magnetosphere. The other interpretations on the anisotropy are reflected in many papers [ Iucci et al ., ; Krymsky et al ., ]. Practically, in all cases of nonsimultaneous start of the FDs, we have a big anisotropy of the CR that is the basis of FDs’ precursors, at least [ Papailiou et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Simultaneity of Forbush decrease events observed at middle‐latitude neutron monitors

Lee

2013

JGR Space Physics

View full text Add to dashboard Cite

[1] Ground neutron monitors (NMs) sometimes observe a sudden reduction in galactic cosmic ray intensity-the so-called Forbush decrease (FD) event. Such events are mainly associated with interplanetary coronal mass ejections passing around the Earth and corotating interaction regions in the heliosphere. Some FD events are observed globally, either simultaneously or nonsimultaneously, at different NM stations in the case that the simultaneity is determined by the overlapping of the FD main phase, with the period of the cosmic ray intensity decreasing before returning to a steady state. Previous studies have identified two types of FD events with statistically significant differences in the distributions of the main phase onset time. It has been hypothesized that simultaneous FD events occur when a strong magnetic cloud passes by the Earth through the central part of the magnetic barrier, whereas nonsimultaneous events occur if a weaker magnetic cloud passes on the duskside of the magnetosphere. However, the previous statistical analyses were performed using only data from high geomagnetic latitude NM stations in the Northern Hemisphere. To address this shortcoming and to further test the above hypothesis, we repeated the analysis using data from NM stations located at middle latitudes (Jungfraujoch, Irkutsk, and Climax), employing cutoff rigidities 3-6 GV for the last solar maximum period (1998)(1999)(2000)(2001)(2002), spanning the same time period as Oh et al. (2008) that employed high-latitude NM stations. The results of the present statistical analysis support the above hypothesis with high confidence levels.

show abstract

Section: Introductionmentioning

confidence: 99%

Simultaneity of Forbush decrease events observed at middle‐latitude neutron monitors

Lee

2013

JGR Space Physics

View full text Add to dashboard Cite

show abstract

“…The extra-atmospheric nature of seasonal CR intensity variations with peaks during equinoxes was first mentioned in [Dorman et al, 1967]. Results of subsequent theoretical and experimental studies of the nature of annual and semiannual CR intensity variations are reported in [Krymsky et al, 1981[Krymsky et al, , 2007[Krymsky et al, , 2009[Krymsky et al, , 2012Belov et al, 2015], etc. The following facts have been found.…”

Section: Semiannual Variation In the Cosmic Ray Intensity And Seasonal Distribution Of The Number Of Strong Earthquakesmentioning

confidence: 99%

“…The following facts have been found. The semiannual and annual CR intensity varia-tions are caused, on the one hand, by the presence of the heliolatitude gradient of the CR density, which is due to the north-south asymmetry in the low-latitude heliosphere; and, on the other hand, by the position and opening of the IMF neutral layer, as well as by the asymmetry in activity of solar hemispheres [Krymsky et al, 2007[Krymsky et al, , 2009[Krymsky et al, , 2012Belov et al, 2015].…”

Section: Semiannual Variation In the Cosmic Ray Intensity And Seasonal Distribution Of The Number Of Strong Earthquakesmentioning

confidence: 99%

“…Cosmic rays are the main source of the atmosphere ionization up to heights of ~100 km [Usoskin, Kovaltsov, 2006;, which leads to substantial physical changes in atmospheric air [Dorman, 2004;Harrison, Tammet, 2008]. Resulting ions are involved in many atmospheric processes: in the formation of the cloud cover [Pudovkin, Veretenenko, 1995;Svensmark, 1998;Marsh, Svensmark, 2000;Pallé et al, 2004;Usoskin, Kovaltsov, 2006;Voiculescu et al, 2006], in the formation of precipitation [Kniveton, 2004] and aerosols [Lee et al, 2003;Mironova et al, 2008;Lushnikov et al, 2014], and affect the atmosphere transparency [Kudryavtsev, Jungner, 2008Roldugin, Tinsley, 2004], the global electric circuit [Harrison, 2004;Tinsley, 2000;Ermakov, Stozhkov, 2004;Tinsley, Zhou, 2006], and cyclogenesis in the middle and high latitudes [Tinsley et al, 1989;Tinsley, 2012;Veretenenko, Thejll, 2004].…”

Section: Impact Of Cosmic Rays On Atmospheric Processesmentioning

confidence: 99%

See 1 more Smart Citation

Solar activity and Earth seismicity

Yanchukovsky

2021

Solar-Terrestrial Physics

View full text Add to dashboard Cite

Using the results of continuous long-term observations over 50 years (including solar cycles 20–24), we study the relationship between Earth’s seismicity and solar activity. An increase in the number of strong earthquakes on the planet occurs during the decline phase of solar activity when charged particle fluxes from high-latitude coronal holes increase, as well as during solar minimum when the intensity of galactic cosmic rays reaches a maximum. The change in the number of strong earthquakes (with magnitude 6) is considered in terms of variations in the intensity of galactic cosmic rays, Forbush decreases, and ground level enhancements in solar cosmic rays (GLE events). The number of strong earthquakes is shown to increase after Forbush decreases with a time lag from ~1 to ~6 days depending on the amplitude of Forbush decrease and after GLE events the number of strong earthquakes increases by ~8 day. In the number of strong earthquakes, a six-month variation is observed, which seems to follow the six-month variation in cosmic rays with a delay of ~1–2 months. It is surmised that the relationship between solar activity and Earth’s seismicity seems to be mediated through the modulation of galactic cosmic rays and atmospheric processes that provoke the occurrence of earthquakes in regions where the situation has already been prepared by tectonic activity.

show abstract

Studies of Heliospheric Modulation of Cosmic Rays at ShICRA SB RAS and Prospects of Their Further Development

et al. 2021

View full text Add to dashboard Cite

Cosmic-ray anisotropy and density near the neutral sheet of the interplanetary magnetic field

Cited by 7 publications

References 4 publications

Simultaneity of Forbush decrease events observed at middle‐latitude neutron monitors

Simultaneity of Forbush decrease events observed at middle‐latitude neutron monitors

Solar activity and Earth seismicity

Studies of Heliospheric Modulation of Cosmic Rays at ShICRA SB RAS and Prospects of Their Further Development

Contact Info

Product

Resources

About