Local time and seasonal variations in the precipitation of energetic electrons from the inner radiation belt by cyclotron resonance with waves from powerful VLF transmitters

Radio Science ◽  
1995 ◽  
Vol 30 (1) ◽  
pp. 47-55 ◽  
Author(s):  
Dayton W. Datlowe ◽  
William L. Imhof ◽  
Gerald J. Fishman ◽  
Mark H. Finger
Keyword(s):  
Local Time ◽  
Seasonal Variations ◽  
Cyclotron Resonance ◽  
Radiation Belt ◽  
Energetic Electrons

scholarly journals The magnetic local time distribution of energetic electrons in the radiation belt region

2017 ◽  
Vol 122 (8) ◽  
pp. 8108-8123 ◽  
Author(s):  
Hayley J. Allison ◽  
Richard B. Horne ◽  
Sarah A. Glauert ◽  
Giulio Del Zanna
Keyword(s):  
Local Time ◽  
Time Distribution ◽  
Radiation Belt ◽  
Magnetic Local Time ◽  
Energetic Electrons

Statistics of pulsating auroras on the basis of all-sky TV data from five stations. I. Occurrence frequency

1981 ◽  
Vol 59 (8) ◽  
pp. 1150-1157 ◽  
Author(s):  
T. Oguti ◽  
S. Kokubun ◽  
K. Hayashi ◽  
K. Tsuruda ◽  
S. Machida ◽  
...  
Keyword(s):  
Local Time ◽  
Cold Plasma ◽  
Geomagnetic Latitude ◽  
Auroral Oval ◽  
Magnetic Activity ◽  
Occurrence Frequency ◽  
Frequency Of Occurrence ◽  
Occurrence Probability ◽  
Energetic Electrons ◽  
Plasma Irregularities

The frequency of occurrence of pulsating auroras is statistically examined on the basis of all-sky TV data for 34 nights from five stations, in a range from 61.5 to 74.3° in geomagnetic latitude. The results are that: (1) occurrence probability of a pulsating aurora is 100% after 4 h in geomagnetic local time, (2) pulsating auroras occur in the morning hours along the auroral oval even when magnetic activity is as small as 0o ≤ Kp ≤ 1, (3) pulsating auroras occur even in the evening when Kp increases to greater than 3−, (4) drift of pulsating auroras is westward in the evening while it is eastward in the morning hours, (5) the region of pulsating auroras splits into two zones, 64 to 68° and 61 to 63° in geomagnetic latitude, after 4 h geomagnetic local time for Kp from 2o to 3−, and the splitting also appears to exist for greater Kp as evidenced by observation other than our auroral data. These results are discussed in relation to distributions of cold plasma irregularities and energetic electrons in the magnetosphere.

Effect of chorus normal angle on dynamic evolution of radiation belt energetic electrons

2014 ◽  
Vol 354 (2) ◽  
pp. 401-408 ◽  
Author(s):  
Lewei Zhang ◽  
Yihua He ◽  
Si Liu ◽  
Chang Yang ◽  
Qinghua Zhou ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Dynamic Evolution ◽  
Energetic Electrons ◽  
Normal Angle

Statistical studies of energetic electrons in the outer radiation belt

1999 ◽  
Vol 30 (5) ◽  
pp. 625-632 ◽  
Author(s):  
A.D. Johnstone ◽  
D.J. Rodgers ◽  
G.H. Jones
Keyword(s):  
Radiation Belt ◽  
Outer Radiation Belt ◽  
Energetic Electrons ◽  
Statistical Studies

scholarly journals On the radiation belt location during the 23rd and 24th solar cycles

2019 ◽  
Vol 37 (4) ◽  
pp. 719-732
Author(s):  
Alexei V. Dmitriev
Keyword(s):  
North American ◽  
Geomagnetic Field ◽  
Radiation Belt ◽  
Occurrence Rate ◽  
Solar Cycles ◽  
Geomagnetic Jerk ◽  
Outer Radiation Belt ◽  
Energetic Electrons ◽  
Eastern Hemisphere

Abstract. Within the last two solar cycles (from 2001 to 2018), the location of the outer radiation belt (ORB) was determined using NOAA/Polar-orbiting Operational Environmental Satellite (POES) observations of energetic electrons with energies above 30 keV. It was found that the ORB was shifted a little (∼1∘) in the European and North American sectors, while in the Siberian sector the ORB was displaced equatorward by more than 3∘. The displacements corresponded qualitatively to the change in the geomagnetic field predicted by the IGRF-12 model. However, in the Siberian sector, the model has a tendency to underestimate the equatorward shift of the ORB. The shift became prominent after 2012, which might have been related to a geomagnetic “jerk” that occurred in 2012–2013. The displacement of the ORB to lower latitudes in the Siberian sector can contribute to an increase in the occurrence rate of midlatitude auroras observed in the Eastern Hemisphere.

Energetic Electrons Below the Inner Radiation Belt

2019 ◽  
Vol 124 (7) ◽  
pp. 5421-5440 ◽  
Author(s):  
R. S. Selesnick ◽  
Yi‐Jiun Su ◽  
J.‐A. Sauvaud
Keyword(s):  
Radiation Belt ◽  
Energetic Electrons

Characteristics of Non-Methane Hydrocarbons in the Atmosphere of Guangzhou

2011 ◽  
Vol 66-68 ◽  
pp. 59-64
Author(s):  
Long Feng Li ◽  
Xin Ming Wang
Keyword(s):  
Local Time ◽  
Aromatic Hydrocarbons ◽  
Seasonal Variations ◽  
Urban Site ◽  
Diurnal Pattern ◽  
Air Samples ◽  
Mixing Ratios

From March to December 2005 NMHCs were measured in an urban site in Guangzhou. Air samples were collected with canister and analyzed for HMHCs by GC-MSD/FID after cryogenic pre-concentration. Mixing ratios of Alkanes accounted for over 43% in total NMHCs in each month while the shares of aromatic hydrocarbons were 19-28%. In average ethyne was the most abundant compound (5.46 ppbv), followed by propane (4.49 ppbv) and toluene (4.19 ppbv). Seasonal variations of most anthropogenic hydrocarbons revealed higher mixing ratios in autumn-winter than in spring-summer. Isoprene, on the contrary, exhibited the the highest levels in summer and the lowest in spring. Anthropogenic NMHCs typically showed a first peak around 8:00 local time in morning and 20:00 local time in the evening, while isoprene revealed a different bimodal diurnal pattern.

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