Three dimensional solar anisotropy of galactic cosmic rays near the recent solar minimum 23/24

Modzelewska, Renata; Alania, M. V.

doi:10.1088/1742-6596/632/1/012072

Cited by 2 publications

(3 citation statements)

References 20 publications

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“…Recently, we showed (Modzelewska & Alania 2015) that the daily GG index is inversely related with the daily B y component of the HMF for 2007−2012. This effect, according to Swinson's (1969) formulation of the north-south anisotropy, is caused by drift, which we consider an acceptable explanation.…”

Section: Long-period Changes Of the 27-day Variation Amplitudes Of Thmentioning

confidence: 97%

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Quasi-periodic changes in the 3D solar anisotropy of Galactic cosmic rays for 1965–2014

Modzelewska

Alania

2017

A&A

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Aims. We study features of the 3D solar anisotropy of Galactic cosmic rays (GCR) for 1965−2014 (almost five solar cycles, cycles 20−24). We analyze the 27-day variations of the 2D GCR anisotropy in the ecliptic plane and the north-south anisotropy normal to the ecliptic plane. We study the dependence of the 27-day variation of the 3D GCR anisotropy on the solar cycle and solar magnetic cycle. We demonstrate that the 27-day variations of the GCR intensity and anisotropy can be used as an important tool to study solar wind, solar activity, and heliosphere. Methods. We used the components Ar, Aϕ and At of the 3D GCR anisotropy that were found based on hourly data of neutron monitors (NMs) and muon telescopes (MTs) using the harmonic analyses and spectrographic methods. We corrected the 2D diurnal (~24-h) variation of the GCR intensity for the influence of the Earth magnetic field. We derived the north-south component of the GCR anisotropy based on the GG index, which is calculated as the difference in GCR intensities of the Nagoya multidirectional MTs. Results. We show that the behavior of the 27-day variation of the 3D anisotropy verifies a stable long-lived active heliolongitude on the Sun. This illustrates the usefulness of the 27-day variation of the GCR anisotropy as a unique proxy to study solar wind, solar activity, and heliosphere. We distinguish a tendency of the 22-yr changes in amplitude of the 27-day variation of the 2D anisotropy that is connected with the solar magnetic cycle. We demonstrate that the amplitudes of the 27-day variation of the north-south component of the anisotropy vary with the 11-yr solar cycle, but a dependence of the solar magnetic polarity can hardly be recognized. We show that the 27-day recurrences of the GG index and the At component are highly positively correlated, and both are highly correlated with the By component of the heliospheric magnetic field.

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Section: Long-period Changes Of the 27-day Variation Amplitudes Of Thmentioning

confidence: 97%

“…Although the counting rate of GCR intensities in different directions (N2, S 2, and E2) cannot contain exactly the same type of information, the GG is accepted as a good alternative index by the worldwide cosmic ray community (e.g., . Recently, we analyzed (Modzelewska & Alania 2015) Fig. 6.…”

Section: -Day Variation Of the North-south Anisotropymentioning

confidence: 99%

Quasi-periodic changes in the 3D solar anisotropy of Galactic cosmic rays for 1965–2014

Modzelewska

Alania

2017

A&A

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“…Recently, we analyzed [31] a behavior of the quasi-periodic changes of the GG index for 2007-2012 utilizing wavelet time-frequency method.…”

Section: -Day Variation Of the North-south Anisotropymentioning

confidence: 99%

Quasi-periodic changes of three dimensional solar anisotropy of galactic cosmic rays for 1965-2014

Modzelewska¹,

Alania²

2019

Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)

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We study features of the three dimensional (3D) solar anisotropy of galactic cosmic rays (GCR) for 1965-2014 (almost 5 solar cycles 20-24). We analyze the 27-day variations of the two dimensional (2D) GCR anisotropy in the ecliptic plane, and the north-south anisotropy normal to the ecliptic plane. We study the dependence of the 27-day variation of the 3D GCR anisotropy on the solar cycle and solar magnetic cycle. We demonstrate that the 27-day variations of the GCR intensity and anisotropy can be used as an important tool to study solar wind, solar activity and heliosphere. We show that behavior of the 27-variation of the 3D anisotropy verifies an existence of a stable longlived active heliolongitudes on the sun. This finding illustrates usefulness of the 27-day variation of the GCR anisotropy as a unique proxy to study solar wind, solar activity and heliosphere. We distinguish a tendency of the 22-year changes of the amplitudes of the 27-day variation of the 2D anisotropy connected with the solar magnetic cycle. We demonstrate that the amplitudes of the 27-day variation of the north-south component of the anisotropy vary upon the 11 year solar cycle, however, a dependence of the solar magnetic polarity hardly can be recognized. We show that the 27-day recurrences of the GG index and At component are in a high positive correlation, and both are highly correlated with By component of the heliospheric magnetic field.

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Three dimensional solar anisotropy of galactic cosmic rays near the recent solar minimum 23/24

Cited by 2 publications

References 20 publications

Quasi-periodic changes in the 3D solar anisotropy of Galactic cosmic rays for 1965–2014

Quasi-periodic changes in the 3D solar anisotropy of Galactic cosmic rays for 1965–2014

Quasi-periodic changes of three dimensional solar anisotropy of galactic cosmic rays for 1965-2014

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