IO - INTENSE BRIGHTENING NEAR 5 MICROMETERS

被引：49

作者：

WITTEBORN, FC ^{[1
]}

BREGMAN, JD ^{[1
]}

POLLACK, JB ^{[1
]}

机构：

[1] NASA,AMES RES CTR,THEORET & PLANETARY STUDIES BRANCH,MOFFETT FIELD,CA 94035

来源：

SCIENCE | 1979年 / 203卷 / 4381期

关键词：

D O I：

10.1126/science.203.4381.643

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Spectrophotometric observations of the jovian satellite Io on 20 and 21 February 1978 (Universal Time) were made from 1.2 to 5.4 micrometers. Io's brightness at 4.7 to 5.4 micrometers was found to be three to five times greater at an orbital phase angle of 68° than at orbital phase angles of 23° (5.5 hours before the brightening) and 240° (20 hours after the brightening). Since the 5-micrometer albedo of Io is near unity under ordinary conditions, the observed transient phenomenon must have been the result of an emission mechanism. Although several such mechanisms were examined, the actual choice is not clear. Copyright © 1979 AAAS.

引用

页码：643 / 646

页数：4

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