Vth abun - Variable Thermal, Separate Abundances

From RHESSI Wiki

Revision as of 19:59, 1 July 2009 (view source) Agopie (Talk | contribs) (New page: ==Vth Separate Abundances== ===Introduction=== Vth - Separate Abundances can be used to model the thermal portion of the photon spectrum (from ~3keV to ~25keV) including lines produced by ...) ← Older edit		Revision as of 20:03, 1 July 2009 (view source) Agopie (Talk | contribs) Newer edit →
Line 13:		Line 13:
	*a[6] - Relative abundance for Argon		*a[6] - Relative abundance for Argon
	*a[7] - Relative abundance for He, C, N, O, F, Ne, Na, Mg, Al, K		*a[7] - Relative abundance for He, C, N, O, F, Ne, Na, Mg, Al, K
-	**Relative to coronal abundance for Chianti	+	**Relative to coronal abundance for Chianti
-	**Relative to solar abundance for Mewe	+	**Relative to solar abundance for Mewe
-	***(unless user selects a different abundance table manually)	+	***(unless user selects a different abundance table manually)
-	***Keyword options: full/continuum/lines    Chianti/Mewe	+	***Keyword options: full/continuum/lines    Chianti/Mewe
	===Fitting with Vth - Separate Abundances===		===Fitting with Vth - Separate Abundances===

---

Revision as of 20:03, 1 July 2009

Contents 1 Vth Separate Abundances 1.1 Introduction 1.2 Parameters 1.3 Fitting with Vth - Separate Abundances

Vth Separate Abundances

Introduction

Vth - Separate Abundances can be used to model the thermal portion of the photon spectrum (from ~3keV to ~25keV) including lines produced by elements other than Iron and Nickel. This is generally used in used in cases were there is more detail in the data spectrum, for example if a detector has better resolution, such as the XRS detector on MESSENGER, then Vth- Separate Abundances may be a good fit component.

Parameters

vth abun - Optically thin thermal bremsstrahlung radiation function as differential spectrum seen at Earth in units of photon/(cm2 s keV) with separate parameters for relative abundance for Fe/Ni, Ca, S, Si

• a[0] - Emission measure in units of 1e49 cm^(-3)
• a[1] - KT, plasma temperature in keV
• a[2] - Relative abundance for Iron and Nickel
• a[3] - Relative abundance for Calcium
• a[4] - Relative abundance for Sulfur
• a[5] - Relative abundance for Silicon
• a[6] - Relative abundance for Argon
• a[7] - Relative abundance for He, C, N, O, F, Ne, Na, Mg, Al, K
  • Relative to coronal abundance for Chianti
  • Relative to solar abundance for Mewe
    • (unless user selects a different abundance table manually)
    • Keyword options: full/continuum/lines Chianti/Mewe

Fitting with Vth - Separate Abundances