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Las variaciones de luminosidad estelar y el calentamiento global.
Science (New York, N.Y.)
|April 8, 1994
Resumen
El sol es el sol.
Área de la Ciencia:
- * Física solar y astrofísica estelar.
- * Comprender la actividad magnética solar y su impacto en la luminosidad.
- * Paleoclimatología y reconstrucción de la variabilidad solar.
Sus antecedentes:
- * La variación de luminosidad del Sol es mínima en comparación con otras estrellas magnéticamente activas.
- * En estrellas activas, las faculas son menos efectivas para reducir los efectos de atenuación de las manchas solares.
- * El aumento de la actividad magnética solar podría conducir a una mayor variabilidad solar y atenuación.
Objetivo del estudio:
- * Para comparar la variación de luminosidad solar con otras estrellas.
- * Para evaluar el potencial de aumento de la variabilidad solar.
- * Para evaluar la probabilidad de un futuro oscurecimiento solar significativo.
Principales métodos:
- * Análisis comparativo de la modulación de la luminosidad solar y estelar.
- * Examen del papel de las faculas estelares en la regulación de la luminosidad.
- * Análisis de datos proxy paleoclimáticos (carbono-14 y berilio-10) para niveles pasados de actividad solar.
Principales resultados:
- * La variación de la luminosidad solar es menos pronunciada que en estrellas similares.
- * Las faculas solares actualmente proporcionan una atenuación efectiva de los efectos de las manchas solares.
- * La actividad solar pasada, basada en el carbono-14 y el berilio-10, sugiere un aumento limitado de la actividad magnética.
Conclusiones:
- * El Sol es actualmente menos fotométricamente variable que muchas estrellas activas.
- * Los aumentos significativos en la actividad magnética solar, que conducen a una mayor variabilidad, son poco probables en la época actual.
- * Los niveles de actividad magnética del Sol durante milenios sugieren una salida de luminosidad estable.
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