Physics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11611221n&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A11, CiteID A11221
Physics
Ionosphere: Auroral Ionosphere (2704), Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Energetic Particles: Precipitating, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Plasma Waves And Instabilities (2471)
Scientific paper
A multievent study was performed using conjugate measurements of the Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft and an all-sky imager during periods of intense lower-band chorus waves. The thirteen identified cases support our previous finding, based on two events, that the intensity modulation of lower-band chorus near the magnetic equator is highly correlated with quasiperiodic pulsating auroral emissions near the spacecraft's magnetic footprint, indicating that lower-band chorus is the driver of the pulsating aurora. Furthermore, we identified a fortuitous measurement made simultaneously by two THEMIS spacecraft with small spatial separation. The two spacecraft were found to be located in a single pulsating chorus patch and the spacecraft footprints were in the same pulsating auroral patch when intense chorus bursts were measured simultaneously, whereas only one of the spacecraft's footprints was in a patch when the other spacecraft did not detect intense chorus. On the basis of this event, we can estimate the pulsating chorus patch size by mapping the pulsating auroral patches from the ionosphere toward the magnetic equator, giving a roughly circular region of ∼5000 km diameter for corresponding azimuthally elongated patches with ∼100 km size in the ionosphere. Using a ray-tracing-based calculation of the divergence of chorus raypaths from a point source, together with the corresponding resonant energies, we found that the chorus patch size is most probably not a result of ray divergence but a property of the wave excitation region.
Angelopoulos Vassilis
Auster Uli
Bonnell Jerry
Bortnik Jacob
Chen Leon L.
No associations
LandOfFree
Multievent study of the correlation between pulsating aurora and whistler mode chorus emissions 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 Multievent study of the correlation between pulsating aurora and whistler mode chorus emissions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multievent study of the correlation between pulsating aurora and whistler mode chorus emissions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-742762