Zobrazeno 1 - 10
of 52
pro vyhledávání: '"P. V. S. Rama Rao"'
Publikováno v:
Annales Geophysicae, Vol 29, Pp 1861-1872 (2011)
Understanding the vertical electron density profile, which is the altitudinal variation of ionospheric electron density distribution is an important aspect for the ionospheric investigations. In this paper, the bottom-side electron density profile
Externí odkaz:
https://doaj.org/article/ba9acf55103b4eec8c54909429c13f3b
Publikováno v:
Annales Geophysicae, Vol 29, Pp 1635-1645 (2011)
The ionospheric equivalent slab-thickness is an important parameter which measures the skewness of the electron density profile of the ionosphere. In this paper, the diurnal, seasonal, day-to-day and latitudinal variations of ionospheric parameter
Externí odkaz:
https://doaj.org/article/24fd8be98a1f4e6896342f0ba3caaa0f
Autor:
P. V. S. Rama Rao, S. Gopi Krishna, J. Vara Prasad, S. N. V. S. Prasad, D. S. V. V. D. Prasad, K. Niranjan
Publikováno v:
Annales Geophysicae, Vol 27, Pp 2101-2110 (2009)
The energetic events on the sun, solar wind and subsequent effects on the Earth's geomagnetic field and upper atmosphere (ionosphere) comprise space weather. Modern navigation systems that use radio-wave signals, reflecting from or propagating thr
Externí odkaz:
https://doaj.org/article/de920e01ab274e37abcdd50f65ca58bd
Autor:
S. Tulasi Ram, P. V. S. Rama Rao, D. S. V. V. D. Prasad, K. Niranjan, A. Raja Babu, R. Sridharan, C. V. Devasia, Sudha Ravindran
Publikováno v:
Annales Geophysicae, Vol 25, Pp 2007-2017 (2007)
Several investigations have been carried out to identify the factors that are responsible for the day-to-day variability in the occurrence of equatorial spread-F (ESF). But the precise forecasting of ESF on a day-to-day basis is still far from rea
Externí odkaz:
https://doaj.org/article/54ef205e8c2e488d8418515347af3927
Autor:
S. Tulasi Ram, P. V. S. Rama Rao, K. Niranjan, D. S. V. V. D. Prasad, R. Sridharan, C. V. Devasia, S. Ravindran
Publikováno v:
Annales Geophysicae, Vol 24, Pp 1609-1616 (2006)
The day-to-day variability in the occurrence of ionospheric scintillations, which are of serious concern in the trans-ionospheric communications, makes their prediction still a challenging problem. This paper reports on a systematic study in quant
Externí odkaz:
https://doaj.org/article/610039b5eed44957ab738abde028fc8f
Publikováno v:
Annales Geophysicae, Vol 24, Pp 1567-1580 (2006)
The scintillation data (S4-index) at the L-band frequency of 1.575GHz, recorded from a total of 18 GPS receivers installed at different locations in India under the GAGAN project, have provided us with a unique opportunity, for the first time in t
Externí odkaz:
https://doaj.org/article/04615105c4464e39bd8e62aac728e883
Autor:
P. V. S. Rama Rao, S. Tulasi Ram, K. Niranjan, D. S. V. V. D. Prasad, S. Gopi Krishna, N. K. M. Lakshmi
Publikováno v:
Annales Geophysicae, Vol 23, Pp 2457-2464 (2005)
Characteristics of simultaneous VHF (244 MHz) and L-band (1.5 GHz) scintillations recorded at a low-latitude station, Waltair (17.7° N, 83.3° E), during the low sunspot activity year of March 2004 to March 2005, suggest that the occurrence of sc
Externí odkaz:
https://doaj.org/article/3b3bbd7f16c746348c604c23bfbfc82a
Autor:
K. Niranjan, P. S. Brahmanandam, P. Ramakrishna Rao, G. Uma, D. S. V. V. D. Prasad, P. V. S. Rama Rao
Publikováno v:
Annales Geophysicae, Vol 21, Pp 745-750 (2003)
A study carried out on the occurrence of post midnight spread-F events at a low-latitude station, Waltair (17.7° N, 83.3° E), India revealed that its occurrence is maximum in the summer solstice months of the low solar activity period and dec
Externí odkaz:
https://doaj.org/article/bb3f06d96b164515b6d79e72b323e13e
Autor:
V. K. D Srinivasu, P. S. Brahmanandam, G. Uma, D. S. V. V. D. Prasad, P. V. S. Rama Rao, S. Mukherjee
Publikováno v:
Terrestrial, Atmospheric and Oceanic Sciences, Vol 28, Iss 3, p 385 (2017)
This research reports on recently recorded 250 MHz amplitude scintillations at Waltair (17.7°N, 83.3°E), a low-latitude station in India, using the signals radiated from a geostationary satellite (FLEETSAT, 73°E) during a six-year period (2008 - 2
Externí odkaz:
https://doaj.org/article/1d3348e0be9944ee8efc7fed930846e0
Publikováno v:
Annales Geophysicae, Vol 17, Pp 519-525 (1999)
A study of the formation and movement of sequential Sporadic-E layers observed during the night-time hours at two Indian low-latitude stations, SHAR (dip 10°N) and Waltair (dip 20°N) shows that the layer are formed around 19:00 h. IST at altitud
Externí odkaz:
https://doaj.org/article/b81ee516e19c44a38583da5df795a5d8