Determination of interplanetary coronal mass ejection geometry and orientation from ground‐based observations of galactic cosmic rays

Kuwabara, T.; Bieber, J. W.; Evenson, P. A.; Munakata, K.; Yasue, S.; Kato, C.; Fushishita, A.; Tokumaru, M.; Duldig, M. L.; Humble, J. E.; Silva, M. R.; Lago, A. Dal; Schuch, Nelson Jorge

doi:10.1029/2008ja013717

Cited by 48 publications

(33 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The current GMDN consisting of four multidirectional muon detectors was completed in 2006 by expanding the São Martinho detector and installing a new detector in Kuwait. Since then, the temporal variations of the anisotropy and density gradient in association with the ICME and corotating interaction regions have been analyzed on an hourly basis using the observations with the GMDN (Rockenbach et al 2014;Okazaki et al 2008;Kuwabara et al 2004;Kuwabara et al 2009). …”

Section: Introductionmentioning

confidence: 99%

The spatial density gradient of galactic cosmic rays and its solar cycle variation observed with the Global Muon Detector Network

et al. 2014

View full text Add to dashboard Cite

We derive the long-term variation of the three-dimensional (3D) anisotropy of approximately 60 GV galactic cosmic rays (GCRs) from the data observed with the Global Muon Detector Network (GMDN) on an hourly basis and compare it with the variation deduced from a conventional analysis of the data recorded by a single muon detector at Nagoya in Japan. The conventional analysis uses a north-south (NS) component responsive to slightly higher rigidity (approximately 80 GV) GCRs and an ecliptic component responsive to the same rigidity as the GMDN. In contrast, the GMDN provides all components at the same rigidity simultaneously. It is confirmed that the temporal variations of the 3D anisotropy vectors including the NS component derived from two analyses are fairly consistent with each other as far as the yearly mean value is concerned. We particularly compare the NS anisotropies deduced from two analyses statistically by analyzing the distributions of the NS anisotropy on hourly and daily bases. It is found that the hourly mean NS anisotropy observed by Nagoya shows a larger spread than the daily mean due to the local time-dependent contribution from the ecliptic anisotropy. The NS anisotropy derived from the GMDN, on the other hand, shows similar distribution on both the daily and hourly bases, indicating that the NS anisotropy is successfully observed by the GMDN, free from the contribution of the ecliptic anisotropy. By analyzing the NS anisotropy deduced from neutron monitor (NM) data responding to lower rigidity (approximately 17 GV) GCRs, we qualitatively confirm the rigidity dependence of the NS anisotropy in which the GMDN has an intermediate rigidity response between NMs and Nagoya. From the 3D anisotropy vector (corrected for the solar wind convection and the Compton-Getting effect arising from the Earth's orbital motion around the Sun), we deduce the variation of each modulation parameter, i.e., the radial and latitudinal density gradients and the parallel mean free path for the pitch angle scattering of GCRs in the turbulent interplanetary magnetic field. We show the derived density gradient and mean free path varying with the solar activity and magnetic cycles.

show abstract

Section: Introductionmentioning

confidence: 99%

The spatial density gradient of galactic cosmic rays and its solar cycle variation observed with the Global Muon Detector Network

et al. 2014

View full text Add to dashboard Cite

show abstract

“…It has been used for studying the directional anisotropy of high-energy cosmic ray intensity which often shows a dynamic variation when an interplanetary coronal mass ejection (ICME) accompanied by a strong shock approaches and arrives at the Earth (Okazaki et al 2008). It also has been used for studying the physical aspects of these interplanetary structures (Munakata et al 2005;Kuwabara et al 2009). Furthermore, the GMDN has been used for studying a specific cosmic ray flux variation called loss-cone anisotropy, often recorded prior to the arrival at the Earth of interplanetary disturbances related to solar phenomena, which can be used as a tool for space weather prediction (Kuwabara et al 2006;Fushishita et al 2010;Rockenbach et al 2014).…”

Section: The Global Muon Detector Network (Gmdn)mentioning

confidence: 99%

The Temperature Effect in Secondary Cosmic Rays (Muons) Observed at the Ground: Analysis of the Global Muon Detector Network Data

Mendonça

Braga

Echer

et al. 2016

ApJ

Self Cite

View full text Add to dashboard Cite

The analysis of cosmic ray intensity variation seen by muon detectors at Earthʼs surface can help us to understand astrophysical, solar, interplanetary and geomagnetic phenomena. However, before comparing cosmic ray intensity variations with extraterrestrial phenomena, it is necessary to take into account atmospheric effects such as the temperature effect. In this work, we analyzed this effect on the Global Muon Detector Network (GMDN), which is composed of four ground-based detectors, two in the northern hemisphere and two in the southern hemisphere. In general, we found a higher temperature influence on detectors located in the northern hemisphere. Besides that, we noticed that the seasonal temperature variation observed at the ground and at the altitude of maximum muon production are in antiphase for all GMDN locations (low-latitude regions). In this way, contrary to what is expected in high-latitude regions, the ground muon intensity decrease occurring during summertime would be related to both parts of the temperature effect (the negative and the positive). We analyzed several methods to describe the temperature effect on cosmic ray intensity. We found that the mass weighted method is the one that best reproduces the seasonal cosmic ray variation observed by the GMDN detectors and allows the highest correlation with long-term variation of the cosmic ray intensity seen by neutron monitors.

show abstract

“…The MMDs observations and results from Kuwabara et al 9 and Fushishita et al 10 show that the GMDN is a high-quality tool for Space Weather monitoring and forecasting.…”

Section: Discussionmentioning

confidence: 99%

Space Weather and the Global Muon Detector Network – GMDN

Schuch¹,

Petry²,

Rigozo³

et al. 2011

12th International Congress of the Brazilian Geophysical Society &Amp; EXPOGEF, Rio De Janeiro, Brazil, 15–18 August 2011

View full text Add to dashboard Cite

Determination of interplanetary coronal mass ejection geometry and orientation from ground‐based observations of galactic cosmic rays

Cited by 48 publications

References 31 publications

The spatial density gradient of galactic cosmic rays and its solar cycle variation observed with the Global Muon Detector Network

The spatial density gradient of galactic cosmic rays and its solar cycle variation observed with the Global Muon Detector Network

The Temperature Effect in Secondary Cosmic Rays (Muons) Observed at the Ground: Analysis of the Global Muon Detector Network Data

Space Weather and the Global Muon Detector Network – GMDN

Contact Info

Product

Resources

About