The large amplitude event observed over the period 22 may to 4 June, 1973

Mavromichalaki, H.

doi:10.1007/bf00641650

Cited by 11 publications

(2 citation statements)

References 15 publications

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“…Mavromichalaki [11] noticed the large amplitude wave trains of cosmic ray intensity during June, July and August 1973. These events exhibit the same characteristics as the event of May, 1973.…”

Section: Introductionmentioning

confidence: 99%

Harmonics of high-amplitude wave trains in cosmic ray intensity

Mishra

2005

Planetary and Space Science

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Section: Introductionmentioning

confidence: 99%

Harmonics of high-amplitude wave trains in cosmic ray intensity

Mishra

2005

Planetary and Space Science

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“…Owens and Kash [16], selecting only those days in which there are no complication from changing magnetic sectors and eliminating days with a poorly determined anisotropy or mean magnetic field direction, showed that the diffusion is field aligned on essentially all well-determined days [14]. Mavromichalaki [20,21] have shown that the diffusion vector is field aligned during days exhibiting enhanced diurnal variation, the diffusion current on an average basis being driven by large cosmic ray gradients in the ecliptic plane. Mavromichalaki [22] studied the diurnal anisotropy of cosmic-ray intensity and pointed out that the time of maximum diurnal variation shows a remarkable systematic shift towards earlier hours than normal.…”

Section: Introductionmentioning

confidence: 96%

Harmonics of exceptionaly low amplitude anisotropic wave train events in cosmic ray intensity

Mishra

2007

Astrophysics

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The unusually low amplitude anisotropic wave train events (LAEs) in cosmic ray intensity using the ground based Deep River neutron monitor data has been studied during the period 1991-94. It has been observed that the phase of the diurnal anisotropy for the majority of the LAE events remains in the co-rotational direction. However, for some of the LAE events the phase of the diurnal anisotropy shifts towards earlier hours as compared to the annual average values. On the other hand, the amplitude of the semi-diurnal anisotropy remains statistically the same, whereas phase shift-towards later hours; a similar trend has also been found in case of tri-diurnal anisotropy. The high-speed solar wind streams do not play a significant role in causing the LAE events. The occurrence of LAE is independent of the nature of the Bz component of IMF polarity.

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Application of diffusion — Convection model to diurnal anisotropy data

Mavromichalaki

1989

Earth Moon Planet

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The diurnal anisotropy of cosmic-ray intensity observed over the period [1970][1971][1972][1973][1974][1975][1976][1977] has been analysed using neutron-monitor data of the Athens and Deep River stations. Our results indicate that the time of the maximum of diurnal variation shows a remarkable systematic shift towards earlier hours than normally beginning in 1971. This phase shift continued until 1976, the solar activity minimum, except for a sudden shift to a later hour for one year, in 1974, the secondary maximum of solar activity.This behavior of the diurnal time of maximum has been shown to be consistent with the convectivediffusive mechanism which relates the solar diurnal anisotropy of cosmic-rays to the dynamics of the solar wind and of the interplanetary magnetic field. Once again we have confirmed the field-aligned direction of the diffusive vector independently of the interplanetary magnetic field polarity. It is also noteworthy that the diurnal phase may follow in time the variations of the size of the polar coronal holes. All these are in agreement with the drift motions of cosmic-ray particles in the interplanetarty magnetic field during this time period.

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The large amplitude event observed over the period 22 may to 4 June, 1973

Cited by 11 publications

References 15 publications

Harmonics of high-amplitude wave trains in cosmic ray intensity

Harmonics of high-amplitude wave trains in cosmic ray intensity

Harmonics of exceptionaly low amplitude anisotropic wave train events in cosmic ray intensity

Application of diffusion — Convection model to diurnal anisotropy data

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