Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Michael Rietveld"'
Autor:
Shin-ichiro Oyama, Heikki Vanhamäki, Lei Cai, Anita Aikio, Michael Rietveld, Yasunobu Ogawa, Tero Raita, Mirjam Kellinsalmi, Kirsti Kauristie, Boris Kozelov, Atsuki Shinbori, Kazuo Shiokawa, Takuo T. Tsuda, Takeshi Sakanoi
Publikováno v:
Earth, Planets and Space, Vol 74, Iss 1, Pp 1-17 (2022)
Abstract The thermospheric wind response to a sudden westward turning of the ion velocity at a high latitude was studied by analyzing data obtained with a Fabry–Perot interferometer (FPI; 630 nm), Dynasonde, and Swarm A & C satellites during a conj
Externí odkaz:
https://doaj.org/article/f1c0d9a93a554d81ae5f7ef5e41bf4bf
Autor:
Michael Rietveld, Andrew Senior
Publikováno v:
Remote Sensing, Vol 15, Iss 17, p 4294 (2023)
The claim that incoherent scatter radar data show electron density enhancements of 50–80% during some ionospheric heating experiments in a recent paper is questioned. The backscatter from the monostatic radar can indeed be enhanced during these exp
Externí odkaz:
https://doaj.org/article/982d743c6b6b4d28b9a29d6e035332ec
Publikováno v:
Earth and Planetary Physics, Vol 3, Iss 5, Pp 391-399 (2019)
An extraordinary (X-mode) electromagnetic wave, injected into the ionosphere by the ground-based heating facility at Tromsø, Norway, was utilized to modify the ionosphere on November 6, 2017. The high-power high-frequency transmitter facility locate
Externí odkaz:
https://doaj.org/article/21396cbbb21b413ab65c8030ea3169b6
Autor:
Tinna L. Gunnarsdottir, Arne Poggenpohl, Ingrid Mann, Alireza Mahmoudian, Peter Dalin, Ingemar Haeggstroem, Michael Rietveld
Publikováno v:
Annales Geophysicae. 41:93-114
Polar mesospheric summer echo (PMSE) formation is linked to charged dust/ice particles in the mesosphere. We investigate the modulation of PMSEs with radio waves based on measurements with EISCAT VHF radar and EISCAT heating facility during low solar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8da46d881ab11784751bdc7cfc5729d7
https://doi.org/10.5194/angeo-41-93-2023
https://doi.org/10.5194/angeo-41-93-2023
Autor:
Tinna Gunnarsdottir, Arne Poggenpohl, Ingrid Mann, Alireza Mahmoudian, Peter Dalin, Ingemar Haeggstroem, Michael Rietveld
The formation of Polar Mesospheric Summer Echoes (PMSE) is linked to the presence of charged dust/ice particles in the mesosphere and the PMSE modulation is a possible way to observe the effect of dust charging. We investigate the modulation of PMSE
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::adfe13749c383ca6569bac26c3f51dfc
https://doi.org/10.5194/angeo-2022-16
https://doi.org/10.5194/angeo-2022-16
We present the results of comparing the total electron content measurements based on GLONASS satellite signals and the EISCAT UHF incoherent scatter radar (Tromsø, Norway) during modification of the high-latitude ionosphere in the magnetic zenith di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ac64369d24c1861c513c7122e252d0a6
https://hdl.handle.net/10037/22791
https://hdl.handle.net/10037/22791
Publikováno v:
SSRN Electronic Journal.
This article condenses academic progress in predicting long-term equity market returns into a practitioner model of unparalleled simplicity and accuracy. It is based on Campbell and Thomson’s 2008 steady-state model with the current book-to-market
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::362918b2d71f1ae7b088073eaf34a491
https://doi.org/10.2139/ssrn.3298471
https://doi.org/10.2139/ssrn.3298471
Publikováno v:
SSRN Electronic Journal.
This article will argue the following key points: (1) Equity market prices are in equilibrium when they equal net worth (or Tobin’s q reaches unity). (2) Prices can temporarily digress from Tobin’s equilibrium by cyclical mismatches between equit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bfc90919a59432a50617a9fd7a27b7a6
https://doi.org/10.2139/ssrn.3298499
https://doi.org/10.2139/ssrn.3298499