Comparative Study of First Two Harmonics in Cosmic Ray Intensity for the Period 1964-95

Rekha Agarwal MISHRA; Rajesh K. MISHRA

Makale detayları

Comparative Study of First Two Harmonics in Cosmic Ray Intensity for the Period 1964-95

Yazarlar:

Rekha Agarwal MISHRA | Rajesh K. MISHRA

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2004 Vol.28 Issue 4, pp.237-246

Belge Tipi:

Makale

Yayın Tarihi:

3/2004

Belge Dili:

Türkçe

Document ID (Org No.):

2000761694

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Anahtar kelimeler:

Özet:

 

The Deep River neutron monitor data has been harmonically  analyzed for the period 1964--95 covering three solar cycles 20, 21  and 22, looking for a long term trend of the diurnal and semi-diurnal  anisotropies of cosmic ray intensity on geomagnetically 60 quiet days.   The amplitude of both the harmonics remains statistically constant  during 1964-70.  The amplitudes of the first harmonic is found to be  low during 1965, 1967, 1976-77, 1986-87, 1991, 1993 and 1995.  The  amplitude of diurnal anisotropy acquired exceptionally large values in  1985, whereas semi-diurnal anisotropy acquired large values in  1974-75 and in 1984, which coincided with epochs of high-speed solar  wind stream (HSSWS).  The phase of the diurnal anisotropy has shifted  to earlier hours in 1976 and 1995, whereas the phase of semi-diurnal  anisotropy has significantly shifted to earlier hours during 1967,  1977, 1991 and 1995, periods of close to minimum solar activity.  The  diurnal phase shows a shift to later hours during 1971, 1985, 1987 and  1991, whereas semidiurnal phase shows a shift to later hours during  1980, 1984 and 1989.

 

The Deep River neutron monitor data has been harmonically  analyzed for the period 1964--95 covering three solar cycles 20, 21  and 22, looking for a long term trend of the diurnal and semi-diurnal  anisotropies of cosmic ray intensity on geomagnetically 60 quiet days.   The amplitude of both the harmonics remains statistically constant  during 1964-70.  The amplitudes of the first harmonic is found to be  low during 1965, 1967, 1976-77, 1986-87, 1991, 1993 and 1995.  The  amplitude of diurnal anisotropy acquired exceptionally large values in  1985, whereas semi-diurnal anisotropy acquired large values in  1974-75 and in 1984, which coincided with epochs of high-speed solar  wind stream (HSSWS).  The phase of the diurnal anisotropy has shifted  to earlier hours in 1976 and 1995, whereas the phase of semi-diurnal  anisotropy has significantly shifted to earlier hours during 1967,  1977, 1991 and 1995, periods of close to minimum solar activity.  The  diurnal phase shows a shift to later hours during 1971, 1985, 1987 and  1991, whereas semidiurnal phase shows a shift to later hours during  1980, 1984 and 1989.

Makale detayları

Comparative Study of First Two Harmonics in Cosmic Ray Intensity for the Period 1964-95

Yazarlar:

Rekha Agarwal MISHRA | Rajesh K. MISHRA

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2004 Vol.28 Issue 4, pp.237-246

Belge Tipi:

Makale

Yayın Tarihi:

3/2004

Belge Dili:

Türkçe

Document ID (Org No.):

2000761694

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Cosmic rays

Diurnal

Semi-diurnal

Anisotropy and Solar poloidal magnetic field.

Sayı

Makale detayları

Comparative Study of First Two Harmonics in Cosmic Ray Intensity for the Period 1964-95

Yazarlar: Rekha Agarwal MISHRA | Rajesh K. MISHRA

Yayıncı: TUBITAK

Dergi: Turkish Journal of Physics 2004 Vol.28 Issue 4, pp.237-246

Belge Tipi: Makale

Yayın Tarihi: 3/2004

Belge Dili: Türkçe

Document ID (Org No.): 2000761694

Sıklık: İki Aylık

eISSN: 1303-6122

pISSN: 1300-0101

Cosmic rays

Diurnal

Semi-diurnal

Anisotropy and Solar poloidal magnetic field.

Sayı

Yazarlar:

Rekha Agarwal MISHRA | Rajesh K. MISHRA

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2004 Vol.28 Issue 4, pp.237-246

Belge Tipi:

Makale

Yayın Tarihi:

3/2004

Belge Dili:

Türkçe

Document ID (Org No.):

2000761694

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101