HIGH-LATITUDE BOUNDARY OF THE OUTER RADIATION ZONE AT 1000 KM

1964 ◽  
Vol 42 (4) ◽  
pp. 616-626 ◽  
Author(s):  
I. B. McDiarmid ◽  
J. R. Burrows
Keyword(s):  
Magnetic Field ◽  
Local Time ◽  
Equatorial Plane ◽  
High Latitude ◽  
Earth’S Magnetic Field ◽  
Particle Detectors ◽  
Earth's Magnetic Field ◽  
Radiation Zone ◽  
Local Noon

Particle detectors on the Alouette satellite have been used to determine the average high-latitude boundary of the outer radiation zone at 1000 km as a function of local time. The boundary for electrons with energies greater than 40 kev is approximately symmetrical with respect to the noon–midnight meridian and occurs at the highest latitude near local noon, shifting between 4° and 5° to its lowest value near local midnight. There is very little difference in the average boundaries of so-called trapped and precipitated electrons. The results are discussed in terms of measurements of electrons with similar energies in the equatorial plane and models of the earth's magnetic field.

scholarly journals On certain average characteristics of world wide magnetic disturbance

1927 ◽  
Vol 115 (771) ◽  
pp. 242-267 ◽  
Keyword(s):  
Magnetic Field ◽  
Diurnal Variation ◽  
Local Time ◽  
World Wide ◽  
Magnetic Storms ◽  
The Other ◽  
Magnetic Disturbance ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field ◽  
Three Components

1. This paper forms a sequel to one entitled “An Outline of a Theory of Magnetic Storms,” published several years ago. In that paper I determined the average additional variations in the three components of the earth's magnetic field (for observatories in magnetic latitudes up to about 60°N.) which during times of considerable magnetic disturbance—commonly called magnetic storms —are superposed on the normal variations. The storms dealt with were such as had a commencement sufficiently definite for its epoch to be estimated to within an hour. The average additional variations of the field were shown to be separable into two parts, one depending on “storm-time” (that is, time reckoned from the commencement of the storm), and the other being a “diurnal” variation depending on local time. Besides these average variations there are, of course, less regular features peculiar to each individual storm.

scholarly journals Observing Earth’s magnetic environment with the GRACE-FO mission

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
C. Stolle ◽  
I. Michaelis ◽  
C. Xiong ◽  
M. Rother ◽  
Th. Usbeck ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Local Time ◽  
Noise Level ◽  
High Amplitude ◽  
Magnetic Data ◽  
Storm Event ◽  
Earth’S Magnetic Field ◽  
Magnetic Field Model ◽  
Earth's Magnetic Field ◽  
The Mean

AbstractThe Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission carries magnetometers that are dedicated to enhance the satellite’s navigation. After appropriate calibration and characterisation of artificial magnetic disturbances, these observations are valuable assets to characterise the natural variability of Earth’s magnetic field. We describe the data pre-processing, the calibration, and characterisation strategy against a high-precision magnetic field model applied to the GRACE-FO magnetic data. During times of geomagnetic quiet conditions, the mean residual to the magnetic model is around 1 nT with standard deviations below 10 nT. The mean difference to data of ESA’s Swarm mission, which is dedicated to monitor the Earth’s magnetic field, is mainly within ± 10 nT during conjunctions. The performance of GRACE-FO magnetic data is further discussed on selected scientific examples. During a magnetic storm event in August 2018, GRACE-FO reveals the local time dependence of the magnetospheric ring current signature, which is in good agreement with results from a network of ground magnetic observations. Also, derived field-aligned currents (FACs) are applied to monitor auroral FACs that compare well in amplitude and statistical behaviour for local time, hemisphere, and solar wind conditions to approved earlier findings from other missions including Swarm. On a case event, it is demonstrated that the dual-satellite constellation of GRACE-FO is most suitable to derive the persistence of auroral FACs with scale lengths of 180 km or longer. Due to a relatively larger noise level compared to dedicated magnetic missions, GRACE-FO is especially suitable for high-amplitude event studies. However, GRACE-FO is also sensitive to ionospheric signatures even below the noise level within statistical approaches. The combination with data of dedicated magnetic field missions and other missions carrying non-dedicated magnetometers greatly enhances related scientific perspectives.

The Atlas of the Earth's Magnetic Field

2012 ◽  
Author(s):  
A. Soloviev ◽  
A. Khokhlov ◽  
E. Jalkovsky ◽  
A. Berezko ◽  
A. Lebedev ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field

Atlas of Earth's magnetic field

2011 ◽  
Vol 12 (2) ◽  
pp. 1-9
Author(s):  
A. E. Berezko ◽  
A. V. Khokhlov ◽  
A. A. Soloviev ◽  
A. D. Gvishiani ◽  
E. A. Zhalkovsky ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field

scholarly journals Night-time Sferic Propagation at Frequencies Below 10 KHz

1967 ◽  
Vol 20 (1) ◽  
pp. 101 ◽  
Author(s):  
KJW Lynn ◽  
J Crouchley
Keyword(s):  
Magnetic Field ◽  
Geographic Distribution ◽  
Angle Of Incidence ◽  
European Studies ◽  
Earth’S Magnetic Field ◽  
Night Time ◽  
The West ◽  
Earth's Magnetic Field ◽  
Effective Angle

Results of a study at Brisbane of individual night-time sferics of known origin are described. A propagation attenuation minimum was observed in the 3-6 kHz range. The geographic distribution of sferic types was also examined. Apparent propagation asynunetries were observed, since sferics were detected at greater ranges to the west than to the east at 10 kHz, whilst the number of tweek-sferics arising from the east was about four times that arising from the west. Comparison with European studies suggest that these asymmetries are general. These results are then " interpreted in terms of an ionospheric reflection cgefficient which is a function of the effective angle of incidence of the wave on the ionosphere and of orientation with respect to the Earth's magnetic field within the ionosphere.

Low absolute paleointensity during Late Miocene Noma excursion of the Earth’s magnetic field

2019 ◽  
Vol 287 ◽  
pp. 10-20 ◽  
Author(s):  
Kazuhiro Okayama ◽  
Nobutatsu Mochizuki ◽  
Yutaka Wada ◽  
Yo-ichiro Otofuji
Keyword(s):  
Magnetic Field ◽  
Late Miocene ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field

Directions and intensities of the Earth’s magnetic field during a reversal: results from the Permo-Triassic Siberian trap basalts, Russia

2004 ◽  
Vol 218 (1-2) ◽  
pp. 197-213 ◽  
Author(s):  
Christoph Heunemann ◽  
David Krása ◽  
Heinrich C Soffel ◽  
Evguenij Gurevitch ◽  
Valerian Bachtadse
Keyword(s):  
Magnetic Field ◽  
Earth’S Magnetic Field ◽  
Siberian Trap ◽  
Earth's Magnetic Field
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