scholarly journals Ion cyclotron waves, pickup ions, and Io's neutral exosphere

2000 ◽  
Vol 105 (A11) ◽  
pp. 25379-25389 ◽  
Author(s):  
F. J. Crary ◽  
F. Bagenal
Keyword(s):  
Pickup Ions ◽  
Ion Cyclotron Waves ◽  
Ion Cyclotron

Ion Cyclotron Waves on Lunar Surface: Apollo Observations and Implications for Future Lunar Missions

2020 ◽  
Author(s):  
Cassandra Armstrong ◽  
Peter Chi
Keyword(s):  
Lunar Surface ◽  
Occurrence Rate ◽  
The Moon ◽  
Pickup Ions ◽  
Poynting Flux ◽  
Ion Cyclotron Waves ◽  
The Earth ◽  
Ion Cyclotron ◽  
Lunar Exosphere ◽  
Lunar Missions

<p>Our previous study of the restored Apollo Lunar Surface Magnetometer (LSM) data discovered that narrowband ion cyclotron waves were often observed at the Apollo 15 and 16 landing sites when the Moon was in the Earth’s magnetotail (Chi et al., 2013). Two mechanisms have been proposed to explain the excitation of ion cyclotron waves at the Moon: the absorption of ions at the lunar surface and the pickup ions from the lunar exosphere. Either process can lead to an ion velocity distribution unstable to ion cyclotron instability, but it is of particular interest to investigate which ion cyclotron waves are associated with the latter mechanism so that the observations of them can provide hints to the type and the number of pickup ions escaped from the lunar exosphere. More recently, Nakagawa et al. (2018) examined the Kaguya data and found similar ion cyclotron waves in the Earth’s magnetotail but at a very low occurrence rate.</p><p>In this study, we perform statistical analysis on the full set of the restored LSM data, including those from the Apollo 12, 15, and 16 missions between 1969 and 1975, that were only partially available to our previous study. We find that the ion cyclotron waves were observed by Apollo 15 LSM approximately 5% of the time, which is about six times more frequently than that found in Kaguya observations. A slightly lower occurrence rate of ion cyclotron waves is found in the Apollo 16 LSM data because of the strong local crustal magnetic field at the Apollo 16 site and the conservation of the Poynting flux. Future joint measurements by lunar landers and orbiters can enable a true comparison of the ion cyclotron waves on the lunar surface and at different altitudes of the exosphere.</p>

scholarly journals First results of low frequency electromagnetic wave detector of TC-2/Double Star program

2005 ◽  
Vol 23 (8) ◽  
pp. 2803-2811 ◽  
Author(s):  
J. B. Cao ◽  
Z. X. Liu ◽  
J. Y. Yang ◽  
C. X. Yian ◽  
Z. G. Wang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Geomagnetic Storms ◽  
Low Frequency ◽  
Wave Detector ◽  
Ion Cyclotron Waves ◽  
Satellite Platform ◽  
Ion Cyclotron ◽  
First Results

Abstract. LFEW is a low frequency electromagnetic wave detector mounted on TC-2, which can measure the magnetic fluctuation of low frequency electromagnetic waves. The frequency range is 8 Hz to 10 kHz. LFEW comprises a boom-mounted, three-axis search coil magnetometer, a preamplifier and an electronics box that houses a Digital Spectrum Analyzer. LFEW was calibrated at Chambon-la-Forêt in France. The ground calibration results show that the performance of LFEW is similar to that of STAFF on TC-1. The first results of LFEW show that it works normally on board, and that the AC magnetic interference of the satellite platform is very small. In the plasmasphere, LFEW observed the ion cyclotron waves. During the geomagnetic storm on 8 November 2004, LFEW observed a wave burst associated with the oxygen ion cyclotron waves. This observation shows that during geomagnetic storms, the oxygen ions are very active in the inner magnetosphere. Outside the plasmasphere, LFEW observed the chorus on 3 November 2004. LFEW also observed the plasmaspheric hiss and mid-latitude hiss both in the Southern Hemisphere and Northern Hemisphere on 8 November 2004. The hiss in the Southern Hemisphere may be the reflected waves of the hiss in the Northern Hemisphere.

scholarly journals Ion cyclotron waves at Mars: Occurrence and wave properties

2014 ◽  
Vol 119 (7) ◽  
pp. 5244-5258 ◽  
Author(s):  
H. Y. Wei ◽  
M. M. Cowee ◽  
C. T. Russell ◽  
H. K. Leinweber
Keyword(s):  
Ion Cyclotron Waves ◽  
Ion Cyclotron ◽  
Wave Properties
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