LATITUDE VARIATIONS IN INTERPLANETARY LYMAN-ALPHA DATA FROM THE GALILEO EUVS MODELED WITH SOLAR HE 1083 NM IMAGES

摘要

Observations of interplanetary Lyman-alpha obtained by the Galileo Extreme Ultraviolet Spectrometer (EUVS) experiment near solar maximum in 1990 show a distinct migration in the upwind brightness maximum from 36+/-5 degrees N to 6+/-5 degrees N ecliptic latitude over a period of several months. Our earlier models based on solar Lyman-alpha flux proxies appropriate for use in the ecliptic plane (Pryer et al., 1992; Ajello et al., 1994) capture the solar rotation effects present in the data, but do not reproduce this latitude migration. We introduce a new type of model that uses He 1083 nm images to produce a proxy for Lyman-alpha as a function of both solar longitude and latitude. This model reproduces the observed latitude migration of the Lyman-alpha brightness maximum. [References: 14]