Documentation for /eve_analysis/ssw/ssw/sdo/eve/idl/

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sam_ab_to_ll.pro


top source sam_ab_to_ll

utility

sam_ab_to_ll, jd, alpha, beta, lat=lat, lon=lon [, r_1au=r_1au] [, b0=b0]

Given a time, alpha angle, and beta angle from the center of the solar disk, calculate the corresponding heliocentric latitude and longitude. Both take into account B0 "nodding" of Sun

Parameters

jd in required

Julian Date of observation, UTC, TAI, TT, doesn't matter. This function is not accurate enough to differentiate.

alpha in required

Horizontal angle from center of solar disk, arcmin, positive east "left" on published sam images

beta in required

Vertical angle from center of solar disk, arcmin, positive north "up" on published sam images

Keywords

lat out required

Heliocentric latitude in degrees

lon out required

Heliocentric longitude in degrees, 0deg through sub-earth point

r_1au out optional

Distance from Earth to Sun in km.

b0 out optional

Heliocentric latitude of sub-earth point. "Nodding" angle of Sun as viewed from Earth, positive when north pole of Sun is tilted towards Earth.

File attributes

Modification date: Tue Sep 11 18:57:04 2012
Lines: 78
Docformat: rst rst