Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Lars P. Dyrud"'
Publikováno v:
Annales Geophysicae, Vol 39, Pp 709-719 (2021)
Non-specular meteor trail echoes are radar reflections from plasma instabilities that are caused by field-aligned irregularities. Meteor simulations are examined to show that these plasma instabilities, and thus the associated meteor trail echo, stro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6706c01cf04b51cba09e2a378e8311ad
https://doi.org/10.5194/angeo-39-709-2021
https://doi.org/10.5194/angeo-39-709-2021
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. 56:681-693
A technique using satellite-link signal attenuation measurements for estimating rainfall accumulation along the link path is evaluated. Power law relationships between attenuation rate $A$ and rainfall rate $R$ are used to estimate $R$ and rainfall a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e79d24e8489ababad663bab58501816
https://doi.org/10.1109/tgrs.2017.2753045
https://doi.org/10.1109/tgrs.2017.2753045
Publikováno v:
Annales Geophysicae, Vol 29, Pp 2277-2286 (2011)
We present the first global simulations on the occurrence of meteor trail plasma irregularities. These results seek to answer the following questions: when a meteoroid disintegrates in the atmosphere, will the resulting trail become plasma turbulent?
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::03d223c42c92e84e1be1eae0c6deb525
https://www.ann-geophys.net/29/2277/2011/
https://www.ann-geophys.net/29/2277/2011/
Publikováno v:
Annales Geophysicae, Vol 27, Pp 1961-1967 (2009)
Annales Geophysicae, Vol 27, Iss 5, Pp 1961-1967 (2009)
Annales Geophysicae, Vol 27, Iss 5, Pp 1961-1967 (2009)
We present results of simulated radar observations of meteor trails in an effort to show how non-specular meteor trails are expected to vary as a function of a number of key atmospheric, ionospheric and meteoroid parameters. This paper identifies whi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5b33b4f6792e425e8071519c89034d6f
https://www.ann-geophys.net/27/1961/2009/
https://www.ann-geophys.net/27/1961/2009/
Publikováno v:
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XL-7/W3, Pp 1083-1087 (2015)
Until very recently, the commercialization of Earth observation systems has largely occurred in two ways: either through the detuning of government satellites or the repurposing of NASA (or other science) data for commercial use. However, the converg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::55e80d54f61f06b37f13ff955bdc0ead
http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/1083/2015/isprsarchives-XL-7-W3-1083-2015.pdf
http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/1083/2015/isprsarchives-XL-7-W3-1083-2015.pdf
Autor:
Viacheslav Merkin, C. L. Waters, Haje Korth, Robin J. Barnes, Lars P. Dyrud, D. L. Green, Brian J. Anderson
Publikováno v:
Geophysical Research Letters. 41:3017-3025
The Active Magnetosphere and Planetary Electrodynamics Response Experiment uses magnetic field data from the Iridium constellation to derive the global Birkeland current distribution every 10 min. We examine cases in which the interplanetary magnetic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b96ed1115cfbb60e29d1d72598d777e6
https://doi.org/10.1002/2014gl059941
https://doi.org/10.1002/2014gl059941
Publikováno v:
Radio Science. 48:33-41
[1] We report the role that the ambiguity function (AF) plays on the determination of signal to noise ratio (SNR) collected from meteor head echoes. Theoretical analysis shows that any measured meteor SNR exhibits temporal ripples whose shape is rela
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae9be49ba447a3b8e7ebcace4e0273d6
https://doi.org/10.1029/2012rs005034
https://doi.org/10.1029/2012rs005034
Publikováno v:
Nonlinear Processes in Geophysics, Vol 15, Iss 6, Pp 847-862 (2008)
Scopus-Elsevier
Scopus-Elsevier
Low frequency electrostatic turbulence in the io- nospheric E-region is studied by means of numerical and ex- perimental methods. We use the structure functions of the electrostatic potential as a diagnostics of the fluctuations. We demonstrate the i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::425ec3fedcf0aa6808751df2ce4a20ce
http://www.nonlin-processes-geophys.net/15/847/2008/npg-15-847-2008.pdf
http://www.nonlin-processes-geophys.net/15/847/2008/npg-15-847-2008.pdf
Autor:
Lars P. Dyrud, Diego Janches
Publikováno v:
Journal of Atmospheric and Solar-Terrestrial Physics. 70:1621-1632
This paper reports results obtained using a combined set of models to determine meteoroid properties by comparing expected and observed meteor head-echo signal-to-noise ratio (SNR) and line-of-sight Doppler velocity as measured in high-power and larg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cac9c89f3f411d089953b997d2f1cc40
https://doi.org/10.1016/j.jastp.2008.06.016
https://doi.org/10.1016/j.jastp.2008.06.016
Autor:
Derek Wilson, Hans Pécseli, Chen Chen, Steiner Boerve, Lars P. Dyrud, Yoonjae Lee, Sigrid Close, Jan Trulsen
Publikováno v:
Advances in Space Research. 42:136-142
Every day billions of meteoroids impact and disintegrate in the Earth’s atmosphere. Current estimates for this global meteor flux vary from 2000 to 200,000 tons per year, and estimates for the average velocity range between 10 km/s and 70 km/s. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cef665e6261d3524d51714fa15ce9d0d
https://doi.org/10.1016/j.asr.2007.03.048
https://doi.org/10.1016/j.asr.2007.03.048