Zobrazeno 1 - 10
of 145
pro vyhledávání: '"J. Markkanen"'
Autor:
J. I. Peltoniemi, M. Gritsevich, J. Markkanen, T. Hakala, J. Suomalainen, N. Zubko, O. Wilkman, K. Muinonen
Publikováno v:
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol V-1-2020, Pp 375-382 (2020)
Many natural land surfaces, such as sand or snow, consist of densely packed grains, often covered by dust, water droplets, contaminated with other materials such as possible oil leaks, hoar frost, and can also be internally cracked, porous, and heter
Externí odkaz:
https://doaj.org/article/e54ddd69521045548e3dbcbc1f2bfd73
Publikováno v:
Annales Geophysicae, Vol 31, Pp 859-870 (2013)
This paper is a continuation of an earlier work by Nygrén et al. (2012), where the velocity of a hard target was determined from a set of echo pulses reflected by the target flying through the radar beam. Here the method is extended to include t
Externí odkaz:
https://doaj.org/article/85d7c9e9b4584092aef8f8149c269e83
Publikováno v:
Annales Geophysicae, Vol 30, Pp 1555-1565 (2012)
This paper presents a method of measuring the velocity of a hard target using radar pulses reflected from the target flying through the radar beam. The method has two stages. First, the Doppler shifts of the echo pulses are calculated at a high ac
Externí odkaz:
https://doaj.org/article/2150add8e62447faaf90b38be2b5e44f
Publikováno v:
Annales Geophysicae, Vol 26, Pp 2237-2243 (2008)
We present a new class of alternating codes. Instead of the customary binary phase codes, the new codes utilize either p or p–1 phases, where p is a prime number. The first class of codes has code length pm, where m is a positive integer, the s
Externí odkaz:
https://doaj.org/article/e8d1c2acb89b4c2e88ec845bc3f272a7
Publikováno v:
Annales Geophysicae, Vol 18, Pp 1242-1247 (2000)
Incoherent scatter radars measure ionosphere parameters using modified Thomson scatter from free electrons in the target (see e.g. Hagfors, 1997). The integrated cross section of the ionospheric scatterers is extremely small and the measurements c
Externí odkaz:
https://doaj.org/article/12f35958075f4ca49ea72da241a77c41
Publikováno v:
Annales Geophysicae, Vol 16, Pp 1259-1264 (1998)
EISCAT observations of the interplanetary scintillation of a single source were made over an extended period of time, during which the orientation of the baselines between the two observing sites changed significantly. Assuming that maximum correl
Externí odkaz:
https://doaj.org/article/d2117ee3c0654feeb13d14ee5d0fbb16
Autor:
A. R. Breen, P. J. Moran, C. A. Varley, W. P. Wilkinson, P. J. S. Williams, W. A. Coles, A. Lecinski, J. Markkanen
Publikováno v:
Annales Geophysicae, Vol 16, Pp 1265-1282 (1998)
Co-rotating interaction regions (CIRs) between fast and slow streams of plasma are a prominent feature of the solar wind. Measurements of interplanetary scintillation (IPS) using the three widely separated antennas of the EISCAT facility have been
Externí odkaz:
https://doaj.org/article/fb959a8318da474fab8a89243eafee69
Autor:
A. R. Breen, W. A. Coles, R. R. Grall, M. T. Klinglesmith, J. Markkanen, P. J. Moran, B. Tegid, P. J. S. Williams
Publikováno v:
Annales Geophysicae, Vol 14, Pp 1235-1245 (1996)
EISCAT observations of interplanetary scintillation have been used to measure the velocity of the solar wind at distances between 15 and 130 R⊙ (solar radii) from the Sun. The results show that the solar wind consists of two distinct components,
Externí odkaz:
https://doaj.org/article/5de7d6ba0fed4a3aa1bdf59afd7ac37b
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Akademický článek
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