SM41H-2576
Statistical study of propagation characteristics of Pc1 pearl structures using conjugate ground-satellite observations
Thursday, 17 December 2015
Poster Hall (Moscone South)
Chae Woo Jun1, Kazuo Shiokawa2, Kazue Takahashi3, Kristoff W Paulson4, Ian Schofield5, Martin G Connors5, I. Poddelsky6, B. Shevtsov6, Craig Kletzing7 and John R Wygant8, (1)Solar-Terrestrial Environment Laboratory, Nagoya-Shi, Japan, (2)Nagoya University, Nagoya, Japan, (3)Applied Physics Laboratory Johns Hopkins, Laurel, MD, United States, (4)University of New Hampshire Main Campus, Durham, NH, United States, (5)Athabasca University, Athabasca, AB, Canada, (6)Far Eastern Branch of the Russian Academy of Sciences, Paratunka, Russia, (7)University of Iowa, Iowa City, IA, United States, (8)University of Minnesota Twin Cities, Minneapolis, MN, United States
Abstract:
We investigated statistical characteristics of pearl structures (amplitude modulation) of Pc1 pulsations using conjugate observations with the ground induction magnetometers located at Athabasca (ATH, L = 4.3) in Canada and Magadan (MGD, L = 2.7) in Russia and the Van Allen Probes (RBSP-A and B) satellites located in the inner magnetosphere for a 1-year period (August 2012 to August 2013). We consider a ground magnetometer and a satellite to be conjugate when the satellite footprint is located within 1000 km of the ground magnetometer. From a survey of data acquired during the conjunction periods, we found 42 pearl Pc1events. These events were classified into four categories: structured Pc1 waves observed at both locations (9 events), structured Pc1 waves observed only on the ground (22 events) or in space (0 events), and unstructured Pc1 waves at both locations (11 events). We describe the spatial and temporal distributions of Pc1 pearl structures and their dependence on geomagnetic conditions. We also compare the frequency, the power ratio between space and ground, and the polarization among the four categories of events. In addition, we verified the similarity of Pc1 pearl structures between ground and space observations in order to investigate propagation and polarization characteristics of Pc1 pearl structures from the magnetosphere to the ionosphere.
