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Characteristics of high energy cosmic ray diurnal anisotropy on day-to-day basis

Cosmic Research : Volume 46, Issue 4, August 2008

Cosmic Research : Volume 46, Issue 3, June 2008

Cosmic Research : Volume 46, Issue 2, April 2008

Cosmic Research : Volume 46, Issue 1, February 2008

Cosmic Research : Volume 45

Cosmic Research : Volume 44

Cosmic Research : Volume 43

Cosmic Research : Volume 42

Cosmic Research : Volume 41

Cosmic Research : Volume 40

Cosmic Research : Volume 39

Cosmic Research : Volume 38

Characteristics of high energy cosmic ray diurnal anisotropy on day-to-day basis

Content Provider	Springer Nature Link
Author	Tiwari, C. M. Tiwari, D. P.
Copyright Year	2008
Abstract	Diurnal variation of cosmic ray intensity for the period of 1989 to 2000 at Kiel, Haleakakla, Rome, Hermanus, Calgary, and Goose Bay neutron monitors has been studied. Frequency histograms are generated for each year by using the daily values of amplitudes and phases. In the present analysis we have derived the yearly mean amplitude and phase of the diurnal variation of cosmic ray intensity. It has been concluded from the analysis that the diurnal amplitude is mostly concentrated in between the amplitude values of 0.1% and 0.4%, whereas the phase of diurnal anisotropy is concentrated in the belt of 100 to 225 degrees. As such, the various characteristics of long-term diurnal variation of cosmic ray intensity for the maxima of solar activity cycle 22 to the next maxima of solar activity cycle 23 have been studied. The minimum amplitudes are apparent for the minimum solar activity periods starting from 1995 and up to 1997 at Kiel, Haleakakla, Rome, Hermanus, Calgary and Goose Bay stations. The diurnal amplitude has been found to have almost recovered to its values observed during 1989 to 1990. It is also seen that the diurnal amplitudes are much larger by a factor of two at high/middle latitude stations as compared to that for low latitude stations, where the amplitudes are even ∼01% or less during 1996. The phase is significantly earlier during 1996 and 1997 with some significant change starting in 1995. As such, competitive is a continuous decreasing trend in the diurnal phase with smaller change at high/middle latitude and significantly much larger change at low latitudes.
Ending Page	468
Page Count	4
Starting Page	465
File Format	PDF
ISSN	00109525
e-ISSN	16083075
Journal	Cosmic Research
Issue Number	5
Volume Number	46
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2008-09-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Extraterrestrial Physics, Space Sciences Astrophysics Astronomy, Astrophysics and Cosmology
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Aerospace Engineering Space and Planetary Science

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