Modulation of Cosmic Rays Along with Solar and Heliospheric Anomalies

Heading: 
Space and Atmospheric Physics
1Mishra, RK, 2Mishra, RA
1Computer and IT Section, Tropical Forest Research Institute, P. O. RFRC, Mandla Road, Jabalpur (M. P.) 482 021, India
2Department of Physics, Govt. Model Science College (Autonomous), Jabalpur (M. P.) 482 001, India
Kosm. nauka tehnol. 2007, 13 ;(6):099-108
https://doi.org/10.15407/knit2007.06.099
Publication Language: English
Abstract: 
A study of the cosmic ray intensity data recorded with the ground-based neutron monitor at Deep River along with the associated interplanetary magnetic field and solar wind plasma parameter data during 1981 –1994 was carried out by means of the Fourier analysis. Many days having abnormally high/low amplitudes for successive number of five or more days as compared to the annual average amplitude of diurnal anisotropy were selected as high/low-amplitude anisotropic wave train events (HAE/LAE). The results clearly indicate that the time of maximum of diurnal variation significantly remains in the 18-hr direction for the majority of the HAE/LAE cases. The phase of enhanced diurnal anisotropy shows a remarkable systematic shift towards later hours as compared to the co-rotational direction for some of the HAE cases, whereas it shows a remarkable systematic shift towards earlier hours for some of the LAE cases as compared to the co-rotational direction.
            The majority of the HAE/LAE events occurred when the disturbance storm time index Dst remains negative only. Significant deviations are seen in the cosmic ray intensity during the passage of interplanetary magnetic clouds for both HAE and LAE events. The high-speed solar wind streams (HSSWS) do not play any significant role in the occurrence of these types of events. The interplanetary disturbances (magnetic clouds) are also effective in producing cosmic ray decreases. The source responsible for these unusual anisotropic wave trains in cosmic rays is proposed.
Keywords: cosmic ray, interplanetary magnetic field, solar wind
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