本文章最後由 iheby 於 2015-7-9 13:55 編輯
脈衝星磁層狀態切換 @港大物理系
Seminar: State Switching in Pulsar Magnetospheres
Recent observations at radio frequencies revealed that pulsars exhibit variations in emission properties of time-dependent nature. Phenomena such as drifting subpulses of multiple drift modes, Quasi-periodic switching in emission between on and off states, and the changes in spin-down rate all presents difficulties to the traditional understanding of pulsar emission. Furthermore, studies on the timing noises from radio pulsars suggest that these variations may all be the result of changes in magnetospheric configurations. This also implies the universality of the phenomenon in pulsars. These unusual evolutionary features and complicated characteristics strongly suggest that multiple quasi-stable rotation states are allowed in the magnetospheres and that pulsars can jump abruptly between different states, as oppose to the conventional understanding of single magnetospheric configuration for each pulsars.
In this talk, we will begin with basic introduction to pulsars, and summary on the phenomena possibly related to changes in magnetospheric configurations. We then move on to outlining a model for state switching based on multiple quasi-stable rotation states for pulsar magnetospheres. We will consider drifting subpulses as an example application of the model for explanation of the existence of multiple drift modes and the jumping between them.
時間：2015.08.06(四) 2015.08.07(五) 16:00
地點：香港大學 莊月明物理大樓 五樓 522室
講者：Dr. Rai Yuen (袁少南，中國新疆烏鲁木齊天文台)
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