Zobrazeno 1 - 10
of 35
pro vyhledávání: '"M P, Rietveld"'
Publikováno v:
Annales Geophysicae, Vol 41, Pp 589-600 (2023)
The EISCAT (European Incoherent Scatter Scientific Association) Heating facility was used to transmit powerful high-frequency (HF) electromagnetic waves into the F-region ionosphere to enhance optical emissions at 557.7 and 630.0 nm from atomic oxyge
Externí odkaz:
https://doaj.org/article/c95420d8ba7e4813a52463aedf48c6b9
Autor:
M. T. Rietveld, P. Stubbe
Publikováno v:
History of Geo- and Space Sciences, Vol 13, Pp 71-82 (2022)
We present the historical background of the construction of a major ionospheric heating facility, “Heating”, near Tromsø, Norway, in the 1970s by the Max Planck Institute for Aeronomy; we also detail the facility's subsequent operational history
Externí odkaz:
https://doaj.org/article/69248d056722408fa5476558f96cbb82
Autor:
M. T. Rietveld, A. Senior
Publikováno v:
Annales Geophysicae, Vol 38, Pp 1101-1113 (2020)
We provide an explanation for a mysterious phenomenon that has been recognized in recent years in European Incoherent Scatter (EISCAT) UHF incoherent scatter radar (ISR) measurements during many high-power high-frequency (HF) ionospheric pumping expe
Externí odkaz:
https://doaj.org/article/fd9f7d3d50a845819e97ca8d8f32a97c
Publikováno v:
Annales Geophysicae, Vol 38, Pp 297-307 (2020)
High-frequency electromagnetic pumping of ionospheric F-region plasma at high and mid latitudes gives the strongest plasma response in magnetic zenith, antiparallel to the geomagnetic field in the Northern Hemisphere. This has been observed in optica
Externí odkaz:
https://doaj.org/article/ab823d8343cc475c9d5a0522128b8b05
Autor:
T. T. Tsuda, M. T. Rietveld, M. J. Kosch, S. Oyama, Y. Ogawa, K. Hosokawa, S. Nozawa, T. Kawabata, A. Mizuno
Publikováno v:
Earth, Planets and Space, Vol 70, Iss 1, Pp 1-10 (2018)
Abstract We report a brief survey of matching conditions for artificial aurora optical experiments utilizing the second electron gyro-harmonic (2.7-MHz frequency) in F region heating with O-mode at the EISCAT Tromsø site using dynasonde data from 20
Externí odkaz:
https://doaj.org/article/6f6a9457633649968c85c2bb4c34affe
Autor:
T. T. Tsuda, M. T. Rietveld, M. J. Kosch, S. Oyama, K. Hosokawa, S. Nozawa, T. Kawabata, A. Mizuno, Y. Ogawa
Publikováno v:
Earth, Planets and Space, Vol 70, Iss 1, Pp 1-11 (2018)
Abstract We report a brief survey on conditions for artificial aurora optical experiments in F region heating with O-mode at the EISCAT Tromsø site using dynasonde data from 2000 to 2017. The results obtained in our survey indicate the following: Th
Externí odkaz:
https://doaj.org/article/8a71e26da2e24f72bb75d8dade5e9973
Publikováno v:
Annales Geophysicae, Vol 36, Pp 243-251 (2018)
The response of ionospheric plasma to pumping by powerful HF (high frequency) electromagnetic waves transmitted from the ground into the ionosphere is the strongest in the direction of geomagnetic zenith. We present experimental results from trans
Externí odkaz:
https://doaj.org/article/e14941def7ff4947b98c6befa7756ded
Autor:
H. Y. Fu, W. A. Scales, P. A. Bernhardt, S. J. Briczinski, M. J. Kosch, A. Senior, M. T. Rietveld, T. K. Yeoman, J. M. Ruohoniemi
Publikováno v:
Annales Geophysicae, Vol 33, Pp 983-990 (2015)
Observations of secondary radiation, stimulated electromagnetic emission (SEE), produced during ionospheric modification experiments using ground-based, high-power, high-frequency (HF) radio waves are considered. The High Frequency Active Auroral
Externí odkaz:
https://doaj.org/article/03925c4b7737457ba8f7716ca3a248bc
Publikováno v:
Annales Geophysicae, Vol 33, Pp 737-747 (2015)
We have compared radar observations of polar mesospheric summer echoes (PMSEs) modulated by artificial electron heating, at frequencies of 224 MHz (EISCAT VHF) and 56 MHz (MORRO). We have concentrated on 1 day of observation, lasting ~ 3.8 h. The
Externí odkaz:
https://doaj.org/article/29bc2ebb7c2a473faa6b65a22ce6ff57
Autor:
A. V. Koloskov, Y. M. Yampolski, A. V. Zalizovski, V. G. Galushko, A. S. Kascheev, C. La Hoz, A. Brekke, V. S. Beley, M. T. Rietveld
Publikováno v:
Radio Physics and Radio Astronomy, Vol 19, Iss 4, Pp 324-335 (2014)
A network of HF receivers intended for multi-position monitoring of the ionosphere is described. At present, it includes nine observation sites located at high, middle and low latitudes in both hemispheres of the Earth. The basic element of the netwo
Externí odkaz:
https://doaj.org/article/582a0789287c48f390bdf587dfd997ad