Dear Dr. Bespalov and Dr. Savina,

Thank you very much for submitting your manuscript for publication to Annales Geophysicae.

I have gone through your responses to the referee and the modifications to your manuscript and the issue of how realistic the proposed mechanism would be for excitation of chorus waves in the environment of the inner magnetosphere still remains.
For example:
• Your response to the referee’s comment “The instability requires electrons, or even ideal beam with vz=Ug, which is not realistic either” was that “The beam under consideration is effective…”. However, I don’t think the point of the referee was whether the beam is effective or not but rather, whether such beams can actually be observed in the inner magnetosphere. If they are not observed, then the mechanism is not realistic for the inner magnetosphere environment.
• Your response to the referee’s comment “the favorable wave normal from the proposed mechanism is quite oblique, which is not consistent with often observed quasi-parallel propagation in the literature” was “There are extensive data on the wave normal angle measurements on board THEMIS and Van Allen Probes. There is no theoretical model for oblique electromagnetic chorus.” Nonetheless, no references of such observations are provided.

Dear Dr. Bespalov and Dr. Savina,

Thank you for submitting your work to Annales Geophysicae. I am pleased to accept your manuscript, "An excitation mechanism for discrete chorus elements in the magnetosphere", for publication in the journal.