<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>One of the most striking features of solar wind is its organization into high- and low- speed streams. It is now well established that the passage over the Earth of high-speed solar wind streams leads to geomagnetic disturbances. The high-speed plasma streams are thus a key element in the complex chain of events that link geomagnetic activity to the solar activity and are therefore of great interest to the solar terrestrial physics. Two types of high-speed solar wind streams - coronal-hole-associated (or corotating) and flare-generated - were studied based on magnetic field and solar wind plasma parameters. In the work, the dependence was obtained for cosmic ray (CR) depressions due to high-speed solar wind streams during low-amplitude days. The CR nucleonic intensity data were subjected to the superposed epoch analysis with respect to the start time of high-speed solar wind streams. It was found that streams of both types produce significant deviations in the CR intensity during low-amplitude anisotropic wave train events. At the onset of such streams the CR intensity reaches its minimum during low-amplitude events and then increases statistically.</p></abstract>

One of the most striking features of solar wind is its organization into high- and low- speed streams. It is now well established that the passage over the Earth of high-speed solar wind streams leads to geomagnetic disturbances. The high-speed plasma streams are thus a key element in the complex chain of events that link geomagnetic activity to the solar activity and are therefore of great interest to the solar terrestrial physics. Two types of high-speed solar wind streams - coronal-hole-associated (or corotating) and flare-generated - were studied based on magnetic field and solar wind plasma parameters. In the work, the dependence was obtained for cosmic ray (CR) depressions due to high-speed solar wind streams during low-amplitude days. The CR nucleonic intensity data were subjected to the superposed epoch analysis with respect to the start time of high-speed solar wind streams. It was found that streams of both types produce significant deviations in the CR intensity during low-amplitude anisotropic wave train events. At the onset of such streams the CR intensity reaches its minimum during low-amplitude events and then increases statistically.

Cosmic Ray Nucleonic Intensity in Low-Amplitude Days During the Passage of High-Speed Solar Wind Streams

Department of Physics, Govt. Model Science College (Autonomous), Jabalpur (M. P.) 482 001, INDIA

Computer and Information Technology Section, Tropical Forest Research Institute, P. O.: RFRC, Mandla Road, Jabalpur (M. P.) 482 021, INDIA

Latvian Journal of Physics and Technical Sciences

One of the most striking features of solar wind is its organization into high- and low- speed streams. It is now well established that the passage over the...

Cosmic Ray Nucleonic Intensity in Low-Amplitude Days During the Passage of High-Speed Solar Wind Streams

Publié en ligne: 10 juin 2008

Pages: 61 - 66

DOI: https://doi.org/10.2478/v10047-008-0007-5

Mots clés
cosmic ray, corotating streams, flare-generated streams, solar wind

This content is open access.

Cosmic Ray Nucleonic Intensity in Low-Amplitude Days During the Passage of High-Speed Solar Wind Streams

Publié en ligne: 10 juin 2008

Pages: 61 - 66

DOI: https://doi.org/10.2478/v10047-008-0007-5

Mots cléscosmic ray, corotating streams, flare-generated streams, solar wind

This content is open access.

Mots clés
cosmic ray, corotating streams, flare-generated streams, solar wind