Some observations of the directions of arrival of an ionospherically reflected HF radio signal on a very high latitude path

1997 ◽  
Author(s):  
E.M. Warrington
Keyword(s):  
High Latitude ◽  
Radio Signal ◽  
Very High

scholarly journals SPEAR: Early results from a very high latitude ionospheric heating facility

2007 ◽  
Vol 40 (3) ◽  
pp. 384-389 ◽  
Author(s):  
T.K. Yeoman ◽  
N. Blagoveshchenskaya ◽  
V. Kornienko ◽  
T.R. Robinson ◽  
R.S. Dhillon ◽  
...  
Keyword(s):  
High Latitude ◽  
Ionospheric Heating ◽  
Heating Facility ◽  
Early Results ◽  
Very High

Very high latitude F-region irregularities observed by HF-radar backscatter

1983 ◽  
Vol 10 (9) ◽  
pp. 904-907 ◽  
Author(s):  
K. B. Baker ◽  
R. A. Greenwald ◽  
R. T. Tsunoda
Keyword(s):  
High Latitude ◽  
Hf Radar ◽  
Radar Backscatter ◽  
F Region ◽  
Very High

scholarly journals The Italian Arctic expedition 1899–1900: What happened to the first support party?

Polar Record ◽  
2021 ◽  
Vol 57 ◽  
Author(s):  
Björn Lantz
Keyword(s):  
Seventeenth Century ◽  
High Latitude ◽  
North Pole ◽  
Extant Literature ◽  
The North ◽  
Franz Josef Land ◽  
Very High

Abstract Beginning in the seventeenth century, numerous attempts were made to reach a very high latitude or even the North Pole. One of the more successful of these was the Italian Arctic expedition of 1899–1900, led by Luigi Amedeo di Savoia (Duke of the Abruzzi). Using two successively returning support parties, di Savoia’s second-in-command, Captain Umberto Cagni’s party eventually reached 86°34’N north of their base in the Franz Josef Land archipelago before retreating due to lack of supplies. The second support party also returned safely to the base from 83°16’N. However, the first support party, led by Lieutenant Francesco Querini, disappeared without a trace after returning southwards from 82°32’N. Although previous studies have cited starvation from lack of food supplies or accidents as the potential causes of their disappearance, the extant literature does not provide any deeper analyses to explain these events. This study explores the hypothesis that the first support party in fact turned back from a much more westerly position than they thought. This, in combination with an untimely blizzard that prevented travelling for several days, most likely made it impossible for Querini and his two men to return to base before their limited supplies ran out.

Diurnal Effects in Magnetic Conjugacy at very High Latitude

Nature ◽  
1963 ◽  
Vol 197 (4874) ◽  
pp. 1259-1261 ◽  
Author(s):  
E. M. WESCOTT ◽  
K. B. MATHER
Keyword(s):  
High Latitude ◽  
Magnetic Conjugacy ◽  
Very High

A broad climatology of very high latitude substorms

2012 ◽  
Vol 50 (11) ◽  
pp. 1512-1523 ◽  
Author(s):  
Anand K. Singh ◽  
A.K. Sinha ◽  
Rahul Rawat ◽  
Bulusu Jayashree ◽  
B.M. Pathan ◽  
...  
Keyword(s):  
High Latitude ◽  
Very High

scholarly journals The effects of an interplanetary shock on the high-latitude ionospheric convection during an IMF <I>B<sub>y</sub></I>-dominated period

2008 ◽  
Vol 26 (9) ◽  
pp. 2937-2951 ◽  
Author(s):  
I. Coco ◽  
E. Amata ◽  
M. F. Marcucci ◽  
D. Ambrosino ◽  
J.-P. Villain ◽  
...  
Keyword(s):  
High Latitude ◽  
Geomagnetic Field ◽  
Dynamic Pressure ◽  
Interplanetary Shock ◽  
Ionospheric Convection ◽  
Vortical Structures ◽  
Magnetometer Data ◽  
Northern High Latitude ◽  
Lobe Reconnection ◽  
Very High

Abstract. On 6 January 1998 an interplanetary shock hit the magnetosphere around 14:15 UT and caused a reconfiguration of the northern high-latitude ionospheric convection. We use SuperDARN, spacecraft and ground magnetometer data to study such reconfiguration. We find that the shock front was tilted towards the morning flank of the magnetosphere, while the Interplanetary Magnetic Field (IMF) was By-dominated, with By<0, IMF Bz>0 and |By|>>Bz. As expected, the magnetospheric compression started at the first impact point of the shock on the magnetopause causing an increase of the Chapman-Ferraro current from dawn to dusk and yielding an increase of the geomagnetic field at the geostationary orbit and on the ground. Moreover, the high-latitude magnetometer data show vortical structures clearly related to the interaction of the shock with the magnetosphere-ionosphere system. In this context, the SuperDARN convection maps show that at very high latitudes above the northern Cusp and in the morning sector, intense sunward convection fluxes appear, well correlated in time with the SI arrival, having a signature typical for Bz>0 dominated lobe reconnection. We suggest that in this case the dynamic pressure increase associated to the shock plays a role in favouring the setting up of a new lobe merging line albeit |By|>>Bz≥0.

scholarly journals The Rhodes/Hartrao 2300 Mhz Horn Telescope

1996 ◽  
Vol 168 ◽  
pp. 487-488
Author(s):  
J.L. Jonas
Keyword(s):  
Survey Data ◽  
High Latitude ◽  
Large Scale ◽  
Low Cost ◽  
Radio Continuum ◽  
Cosmic Background ◽  
Galactic Emission ◽  
Frequency Survey ◽  
Low Amplitude ◽  
Very High

The recently completed Rhodes/HartRAO 2300 MHz radio continuum survey is the highest resolution and highest frequency survey of the entire southern sky. This makes it useful for those wishing to model the Galactic foreground in order to study cosmic background emission. Unfortunately there are low-amplitude, large-scale gradients in the survey data which make it difficult to interpret the very high latitude Galactic emission. We describe a small, low-cost horn telescope which we hope to use to correct the gradients in the survey data.

Electrodynamics of very high latitude arcs in the morning sector auroral zone

1988 ◽  
Vol 93 (A2) ◽  
pp. 913 ◽  
Author(s):  
R. M. Robinson ◽  
R. R. Vondrak ◽  
D. Hardy ◽  
M. S. Gussenhoven ◽  
T. A. Potemra ◽  
...  
Keyword(s):  
High Latitude ◽  
Auroral Zone ◽  
Morning Sector ◽  
Very High
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