Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41a1836n&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA41A-1836
Physics
[0689] Electromagnetics / Wave Propagation, [2400] Ionosphere
Scientific paper
An analysis of magnetic field observed by the Oersted satellite indicated the existence of small scale magnetic oscillations with period shorter than 20 seconds for nearly all the time (Taira 2010). Hitherto the magnetic variations with short period, especially shorter than 20 seconds, above the ionosphere has been attributed to the magnetic pulsations of magnetospheric origin. It is known that the Pc3 pulsations can be explained by the field line resonance. Among the characteristics of Pc3 pulsations is that the period becomes shorter with decrease of the latitude. However, a preliminary analysis of the magnetic data obtained by the Oersted satellite shows an opposite tendency that the period becomes longer with decreasing latitude. This suggests that global distribution of magnetic variation in the middle and low latitude over the ionosphere cannot be explained by Pc3. To verify the characteristics observed by the Oersted satellite and to get more information on them, we analyzed the magnetic data obtained by the CHAMP satellite in the sensor coordinate system without using the information of the attitude. Followings are a part of our results: 1. The existence of small scale magnetic oscillations with period shorter than 20 seconds is confirmed for nearly all the time. 2. The tendency is confirmed that the period tends to become longer with the decrease of latitude. 3. The magnetic variation observed on the dayside is much larger than that on the nightside. 4. The amplitude in the East - West component is largest. 5. The magnetic variation on the magnetic dip equator is nearly zero. 6. The amplitude of the oscillations has the tendency of magnetic conjunction, however, not always. These characteristics cannot be explained by Pc3 and may be interpreted as the spatial structure of small scale field-aligned currents with both edges on the ionosphere. The structure of the current system and its generation mechanism will be discussed.
Iyemori Toshihiko
Lühr Hermann
Nakanishi Kouichiro
No associations
LandOfFree
Global distribution of small scale magnetic oscillations in the middle and low latitudes over the ionosphere as observed by CHAMP satellite does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Global distribution of small scale magnetic oscillations in the middle and low latitudes over the ionosphere as observed by CHAMP satellite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Global distribution of small scale magnetic oscillations in the middle and low latitudes over the ionosphere as observed by CHAMP satellite will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-874534