Solar cosmic rays in the near Earth space and the atmosphere

Bazilevskaya, G. A.

doi:10.1016/j.asr.2004.11.019

Cited by 39 publications

(38 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the Forbush effect is hardly discernible in the LPI data at heights below 6 km because of presence of other variations and poor statistical accuracy. Solar energetic particles (SEPs) intrude into the atmosphere sporadically (Bazilevskaya 2005). Most of SEPs are just absorbed in the atmosphere leading to the enhanced ionisation in the polar stratosphere.…”

Section: Temporal Variations Of Ionising Particle Fluxes In the Atmosmentioning

confidence: 99%

Cosmic Ray Induced Ion Production in the Atmosphere

et al. 2008

View full text Add to dashboard Cite

An overview is presented of basic results and recent developments in the field of cosmic ray induced ionisation in the atmosphere, including a general introduction to the mechanism of cosmic ray induced ion production. We summarize the results of direct and indirect measurements of the atmospheric ionisation with special emphasis to long-term variations. Models describing the ion production in the atmosphere are also overviewed together with detailed results of the full Monte-Carlo simulation of a cosmic ray induced atmospheric cascade. Finally, conclusions are drawn on the present state and further perspectives of measuring and modeling cosmic ray induced ionisation in the terrestrial atmosphere.

show abstract

Section: Temporal Variations Of Ionising Particle Fluxes In the Atmosmentioning

confidence: 99%

Cosmic Ray Induced Ion Production in the Atmosphere

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Extreme solar events, however, such as solar flares, have been observed to cause substantial increases in J c (Cobb 1967), on shorter time scales of hours. Energetic solar particle events (Bazilevskaya 2005) generate secondary particles in the atmosphere such as muons, electrons, protons, neutrons and photons. As secondary particles from galactic cosmic rays contribute to surface atmospheric ion production, secondary particles from high-energy solar or geomagnetic events are also expected to increase atmospheric ion production.…”

Section: K2mentioning

confidence: 99%

Enhancement of cloud formation by droplet charging

Harrison

Ambaum

2008

Proc. R. Soc. A.

View full text Add to dashboard Cite

Charge affects the activation of cloud droplets by reducing the minimum supersaturation at which haze droplets begin to grow. Although the droplet charge required to enhance activation is substantial, we show that sufficient charging occurs at the edges of layer clouds because the fair-weather current in the global atmospheric electrical circuit flows through a discontinuity in conductivity. Our theory predicts that droplet neutralization will cause a transient cooling of cloud base. This hypothesis was tested during a period of extreme solar activity, when we detected transient current bursts at the surface beneath a layer of cloud. We attribute these to bursts of ion production, which would cause transient droplet neutralization in the cloud and an associated increase in droplet critical supersaturation. We observed transient decreases in downward long-wave radiation measurements coincident with the transient current bursts. As the vertical current density passing through stratiform clouds is a global phenomenon, there are many regions in which a charge enhancement effect on cloud formation can potentially occur; we find that the effect of charge-enhanced activation on surface radiation in the presentday climate could be as large as 0.1 W m K2 .

show abstract

“…While lower energy SEPs are absorbed in the atmosphere, more energetic particles possess enough energy to initiate an atmospheric cascade similar to GCRs, which eventually reaches the ground and leads to an enhancement of count rates of ground based detectors, specifically neutron monitors (NMs). This special class of SEP events, called ground-level enhancements (GLEs), with the occurrence rate roughly once per year with higher probability during maximum and decline phase of the solar activity cycle Stoker, 1995;Bazilevskaya 2005), can drastically change the Earth's radiation environment (e.g. Vainio et al, 2009, and references therein).…”

Section: Introductionmentioning

confidence: 99%

Assessment of spectral and angular characteristics of sub-GLE events using the global neutron monitor network

Mishev

Poluianov

Usoskin

2017

J. Space Weather Space Clim.

View full text Add to dashboard Cite

-New recently installed high-altitude polar neutron monitors (NMs) have made the worldwide NM network more sensitive to strong solar energetic particle (SEP) events, registered at ground level, namely ground-level enhancement (GLE) events. The DOMC/B and South Pole NMs in addition to marginal cut-off rigidity also possess lower atmospheric cut-off compared to the sea level. As a result, the two high-altitude polar NM stations are able to detect lower energy SEP events, which most likely would not be registered by the other (near sea level) NMs. Here, we consider several candidates for such type of events called sub-GLEs. Using the worldwide NM database (NMDB) records and an optimization procedure combined with simulation of the global NM network response, we assess the spectral and angular characteristics of sub-GLE particles. With the estimated spectral characteristics as an input, we evaluate the effective dose rate in polar and sub-polar regions at typical commercial flight altitude. Hence, we demonstrate that the global NM network is a useful tool to estimate important space weather effects, e.g., the aircrew exposure due to cosmic rays of galactic and/or solar origins.

show abstract

Solar cosmic rays in the near Earth space and the atmosphere

Cited by 39 publications

References 24 publications

Cosmic Ray Induced Ion Production in the Atmosphere

Cosmic Ray Induced Ion Production in the Atmosphere

Enhancement of cloud formation by droplet charging

Assessment of spectral and angular characteristics of sub-GLE events using the global neutron monitor network

Contact Info

Product

Resources

About