Zobrazeno 1 - 10
of 32
pro vyhledávání: '"P. L. Dyson"'
Publikováno v:
Annales Geophysicae, Vol 26, Pp 2911-2921 (2008)
Diurnal patterns of average F-region ionospheric drift (electric field) and their dependence on solar and geomagnetic activity have been defined using digital ionosonde Doppler measurements recorded at a southern mid-latitude station (Bundoora 145
Externí odkaz:
https://doaj.org/article/d7038fd9daf3400e8b9df3c90d2d551f
Publikováno v:
Annales Geophysicae, Vol 26, Pp 877-892 (2008)
SuperDARN radars are sensitive to the collective Doppler characteristics of decametre-scale irregularities in the high latitude ionosphere. The radars routinely observe a distinct transition from large spectral width (>100 m s−1) located at high
Externí odkaz:
https://doaj.org/article/6870eb4f1d4245f289333298a66e3823
Publikováno v:
Annales Geophysicae, Vol 25, Pp 1183-1197 (2007)
Multi-scale structure of the solar wind in the ecliptic at 1 AU undergoes significant evolution with the phase of the solar cycle. Wind spacecraft measurements during 1995 to 1998 and ACE spacecraft measurements during 1997 to 2005 were used to ch
Externí odkaz:
https://doaj.org/article/ce7a20708a404819b0308bf1bbc735f8
Autor:
R. A. Makarevich, P. L. Dyson
Publikováno v:
Annales Geophysicae, Vol 25, Pp 2579-2591 (2007)
The dual HF radars comprising the Tasman International Geophysical Environment Radar (TIGER) system often observe localized high-velocity F-region plasma flows (≥1500 m/s) in the midnight sector (20:00–02:00 MLT) at magnetic latitudes as low as
Externí odkaz:
https://doaj.org/article/dff6a438901c4a65b8382672a56aee3c
Publikováno v:
Annales Geophysicae, Vol 24, Pp 3365-3381 (2006)
At 08:35 UT on 21 November 2004, the onset of an interval of substorm activity was captured in the southern hemisphere by the Far UltraViolet (FUV) instrument on board the IMAGE spacecraft. This was accompanied by the onset of Pi2 activity and sub
Externí odkaz:
https://doaj.org/article/78a34a286f3e49ac8b8940deeb50417d
Autor:
R. A. Makarevich, F. Honary, V. S. C. Howells, A. V. Koustov, S. E. Milan, J. A. Davies, A. Senior, I. W. McCrea, P. L. Dyson
Publikováno v:
Annales Geophysicae, Vol 24, Pp 2375-2389 (2006)
E-region irregularity velocity measurements at large flow angles with the STARE Finland coherent VHF radar are considered in context of the ion and electron velocity data provided by the EISCAT tristatic radar system, CUTLASS Finland coherent HF r
Externí odkaz:
https://doaj.org/article/b130e3226da74e4c8ebf64d87ea76c65
Publikováno v:
Annales Geophysicae, Vol 23, Pp 707-721 (2005)
The effects of the 31 March 2001 severe magnetic storm on the Southern Hemisphere ionosphere have been studied using ground-based and satellite measurements. The prime goal of this comprehensive study is to track the ionospheric response from high
Externí odkaz:
https://doaj.org/article/1f426bf7619a48f2ae8a6f7c9c2b3ccd
Publikováno v:
Annales Geophysicae, Vol 22, Pp 4077-4088 (2004)
Seasonal and diurnal variations in the direction of propagation of medium-scale travelling ionospheric disturbances (MSTIDs) have been investigated by analyzing sea echo returns detected by the TIGER SuperDARN radar located in Tasmania (43.4° S,
Externí odkaz:
https://doaj.org/article/3bba9d8c5e824888b1d3abc3a0f40a49
Publikováno v:
Annales Geophysicae, Vol 22, Pp 4103-4122 (2004)
Super Dual Auroral Radar Network (DARN) radars often detect a distinct transition in line-of-sight Doppler velocity spread, or spectral width, from –1 at lower latitude to >200ms–1 at higher latitude. They also detect a similar boundary, namely
Externí odkaz:
https://doaj.org/article/fb007f1d16784fa8bac62b3ac4fc24bc
Publikováno v:
Annales Geophysicae, Vol 22, Pp 2819-2835 (2004)
During summer months at solar cycle minimum, F-region lacuna and slant-Es conditions (SEC) are common features of daytime ionograms recorded around local magnetic noon at Casey, Antarctica. Digisonde measurements of drift velocity height profiles
Externí odkaz:
https://doaj.org/article/0fa401d341554271a40ac849c97105ac