The curious relationship between chorus and plasmaspheric hiss waves (Invited)
Thursday, 4 September 2014: 8:30 AM
Regency Ballroom (Hyatt Regency)
Jacob Bortnik1, Lunjin Chen2, Wen Li1, Richard M Thorne1, Vassilis Angelopoulos3 and Craig Kletzing4, (1)UCLA, Los Angeles, CA, United States, (2)University of Texas at Dallas, Richardson, TX, United States, (3)UCLA---ESS/IGPP, Los Angeles, CA, United States, (4)Univ. of Iowa, Iowa City, IA, United States
Abstract:
Plasmaspheric hiss is a wideband, incoherent, whistler-mode plasma wave that is found predominantly in inner magnetospheric high-density plasma regions such as the plasmasphere or plasmaspheric drainage plume. The origin of plasmaspheric hiss has been a topic of intense study and controversy ever since its discovery in the late 1960s. A recent set of modeling studies have shown that a different plasma wave, namely whistler-mode chorus, could be responsible for creating plasmaspheric hiss by propagating from its source region in the equatorial plasmatrough, and into the plasmasphere. Early observations made on the THEMIS spacecraft have shown excellent consistency between models and data, but later results concerning the nature of chorus waves and pulsating aurora, the discovery of low-frequency hiss, and coincident observations between high L-shell chorus and hiss have shown that there are facets of the chorus-hiss connection that are still a puzzle. In this talk, we briefly review the chorus-hiss connection mechanism and focus on recent results and open questions.
