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

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esp_calc_pointing.pro


top source esp_calc_pointing

utility

esp_calc_pointing, diodes, jd, alpha=alpha, beta=beta, latitude=latitude, longitude=longitude

Calculate ESP pointing in alpha/beta and heliocentric latitude and longitude. This routine calculates the position of the ESP quadrant diode center of brightness in alpha and beta, explained below, and presuming that the spacecraft is properly pointed at the center of the Sun, the corresponding heliocentric latitude and longitude of the center of brightness.

Parameters

diodes in required

calibrated/dark-corrected diode values. Can be quadrant fraction. These values are normalized before use. Array of 4 values, index 0 to 3 match up with quadrant diode names Q0-Q3

jd in required

julian date of observation

Keywords

alpha out

Solar alpha angle (E/W) in arcminutes. Positive when center of brightness is east/left of ESP axis

beta out

Solar beta angle (N/S) in arcminutes. Positive when center of brightness is north/above ESP axis

latitude out

Heliocentric latitude of ESP center, in degrees, positive north, taking into account the B0 nodding

longitude out

Heliocentric longitude of ESP center, in degrees, sub-earth longitude is zero.

File attributes

Modification date: Tue Sep 11 18:41:47 2012
Lines: 29
Docformat: rst rst