Coordinated observations of Pc5 pulsations in a field line; ground, SuperDARN, and a satellite

Details Coordinated observations of Pc5 pulsations in a field line; ground, SuperDARN, and a satellite Coordinated observations of Pc5 pulsations in a field line; ground, SuperDARN, and a satellite

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm33a1885s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM33A-1885

Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2752] Magnetospheric Physics / Mhd Waves And Instabilities

Scientific paper

Pc5 pulsations are electromagnetic wave at periods of 150-600 s in the ultra-low frequency (ULF) range, which are often observed and have been studied well by ground and satellite magnetometers. The most common mode of Pc5 pulsations is the field line resonance (FLR) of shear Alfvén waves standing along Earth’s magnetic field lines. The ionosphere in both hemisphere acts the reflection boundary of FLR and the ionospheric current generated by electromagnetic waves results in Pc5 pulsations of magnetic fields on the ground. In the magnetosphere, magnetometers and electric field instruments onboard satellites observe directly in situ amplitude of Pc5 pulsations. Previous studies identified Pc5 pulsations in the magnetosphere as one of the key mechanisms of transport and acceleration of energetic electrons in Earth’s outer radiation belt; wave power of Pc5 band is well correlated with radiation belt electron fluxes. In particular, waves in global mode (low-m) are likely more effective than localized mode (high-m). It is important for the space whether study to classify Pc5 effectiveness for radiation belt particles. However, it is difficult to know correct wave numbers from satellite nor ground observations, because satellites know only in situ signals and ground magnetometers integrate all neighbor signals. Thus, we investigated Pc5 pulsations using data from SuperDARN radars, which can observe two-dimensionally the Doppler velocity of ionospheric plasma due to electric-field pulsations of Pc5 along in the line of sight throughout the high latitude. First of all, we investigate the similarity and difference of Pc5 properties among on the ground at Pebek (PBK), Russia by the magnetometer, on the ionosphere in the Doppler velocity in the field-of-view of the SuperDARN rader at King Salmon (KSR), and in the magnetosphere at the geosynchronous ETS-8 satellite by the magnetometer; these align the almost same meridian. In this study, we focus on the toroidal mode pulsation, because some beams of the SuperDARN radar at KSR observe Doppler velocity (E x B drift) in longitudes. From the comparison, we found that Pc5 pulsations in the toroidal mode are commonly observed simultaneously by both magnetometers on the ground and onboard the satellite, while SuperDARN observes Pc5 pulsations independently by pulsations on the ground and at the satellite. In this presentation, we show the several Pc5 pulsations events on ground, SuperDARN and ETS-8, and discuss the reason of the difference.

Affiliated with

Also associated with

No associations

Rating

Coordinated observations of Pc5 pulsations in a field line; ground, SuperDARN, and a 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 Coordinated observations of Pc5 pulsations in a field line; ground, SuperDARN, and a satellite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coordinated observations of Pc5 pulsations in a field line; ground, SuperDARN, and a satellite will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1470610