Zobrazeno 1 - 10
of 108
pro vyhledávání: '"R. Hajra"'
Publikováno v:
Annales Geophysicae, Vol 39, Pp 929-943 (2021)
Seasonal features of geomagnetic activity and their solar-wind–interplanetary drivers are studied using more than five solar cycles of geomagnetic activity and solar wind observations. This study involves a total of 1296 geomagnetic storms of varyi
Externí odkaz:
https://doaj.org/article/cdf6a00d6f744049813e7b79a0c5d8c5
Autor:
R. Hajra
Publikováno v:
Annales Geophysicae, Vol 39, Pp 181-187 (2021)
Long-term variations in the relativistic (∼MeV) electrons in the Earth's radiation belt are explored to study seasonal features of the electrons. An L-shell dependence of the seasonal variations in the electrons is reported for the first time. A cl
Externí odkaz:
https://doaj.org/article/be003f7aebff40f89e54f30ef982c637
Publikováno v:
Nonlinear Processes in Geophysics, Vol 27, Pp 75-119 (2020)
Major geomagnetic storms are caused by unusually intense solar wind southward magnetic fields that impinge upon the Earth's magnetosphere (Dungey, 1961). How can we predict the occurrence of future interplanetary events? Do we currently know enough o
Externí odkaz:
https://doaj.org/article/c8464553239144c69a3450fd3647af7f
Publikováno v:
Annales Geophysicae, Vol 36, Pp 205-211 (2018)
Solar-wind–geomagnetic activity coupling during high-intensity long-duration continuous AE (auroral electrojet) activities (HILDCAAs) is investigated in this work. The 1 min AE index and the interplanetary magnetic field (IMF) Bz component in th
Externí odkaz:
https://doaj.org/article/bb8d1545a8494be184f67e4a5b075e58
Autor:
F. L. Guarnieri, B. T. Tsurutani, L. E. A. Vieira, R. Hajra, E. Echer, A. J. Mannucci, W. D. Gonzalez
Publikováno v:
Nonlinear Processes in Geophysics, Vol 25, Pp 67-76 (2018)
The purpose of this study is to present a wavelet interactive filtering and reconstruction technique and apply this to the solar wind magnetic field components detected at the L1 Lagrange point ∼ 0.01 AU upstream of the Earth. These filtered int
Externí odkaz:
https://doaj.org/article/5904b628bb4f413f9d131bfbf4066dc1
Publikováno v:
Nonlinear Processes in Geophysics, Vol 24, Pp 407-417 (2017)
Considering the magnetic reconnection and the viscous interaction as the fundamental mechanisms for transfer particles and energy into the magnetosphere, we study the dynamical characteristics of auroral electrojet (AE) index during high-intensity
Externí odkaz:
https://doaj.org/article/92494fc48ea74d7fa562dd412b058f7a
Publikováno v:
Annales Geophysicae, Vol 33, Pp 519-524 (2015)
We examine particularly intense substorms (SML ≤–2500 nT), hereafter called "supersubstorms" or SSS events, to identify their nature and their magnetic storm dependences. It is found that these intense substorms are typically isolated events
Externí odkaz:
https://doaj.org/article/06e098e8236a4ae7a3eae4c0084de2e2
Electrojet control of ambient ionization near the crest of the equatorial anomaly in the Indian zone
Autor:
S. K. Chakraborty, R. Hajra
Publikováno v:
Annales Geophysicae, Vol 27, Pp 93-105 (2009)
A long-term (1978–1990) database of total electron content (TEC) from a location (Calcutta: 22.58° N, 88.38° E geographic, dip: 32° N) near the northern crest of the equatorial ionization anomaly has extensively been studied to characterize
Externí odkaz:
https://doaj.org/article/63061254d4f14a2ea4793fdabeb81030
Autor:
S. K. Chakraborty, R. Hajra
Publikováno v:
Annales Geophysicae, Vol 26, Pp 47-57 (2008)
Long-term (1978–1990) total electron content (TEC) data have been analyzed to show the dependence of ambient ionization on EUV radiation from the Sun. TEC observations were made at Calcutta (22.58° N, 88.38° E geographic, dip: 32° N), situate
Externí odkaz:
https://doaj.org/article/08241286bb2740bf952252185b24d8f5
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