NASA’s Solar Probe Plus (SPP) mission will make the first in situ measurements of the solar corona and the birthplace of the solar wind. The FIELDS instrument suite on SPP will make direct measurements of electric and magnetic fields, the properties of in situ plasma waves, electron density and temperature profiles, and interplanetary radio emissions, amongst other things. Here, we describe the scientific objectives targeted by the SPP/FIELDS instrument, the instrument design itself, and the instrument concept of operations and planned data products.

Abstract. The r a t i o of x t o o mode r a d i a t i o n produced when an x mode wave s t r i k e s a s t e e p densi t y gradient i s determined f o r wave and plasma parameters t y p i c a l of those observed i n t h e aurora l k i l o m e t r i c r a d i a t i o n source region. W e f i n d t h a t t h e waves r e f l e c t e d from o r t r a n s m i t t e d through t h e d e n s i t y g r a d i e n t g e n e r a l l y have an o mode component 20 dB o r more weaker than t h e x mode component. This agrees with t h e r a t i o of x t o o mode i n t e n s i t y observed i n a u r o r a l k i l o m e t r i c r a d i a t i o n s i g n a l s near t h e a u r o r a l plasma c a v i t y by both t h e DE 1 and ISIS 1 s p a c e c r a f t .

Aust. J. Phys., 1985,38,687-704 Calculations ofthe relative magnitudes of the four secondary waves produced when a magneto ionic wave encounters an electron density discontinuity within an anisotropic plasma are presented. We identify the different conditions under which each of the secondary waves is the dominant mode, and determine some general properties of the reflection process.

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