Cairo University

MTPR Journal

 

INJECTION OF SCATTERED DISC OBJECTS INTO THE INNER SOLAR SYSTEM IN RESPONSE TO SHRINKAGE OF THE HELIOSPHERE

& doi: https://doi.org/10.1142/9789814504898_0043
STEVEN FOSTER and SHAHINAZ YOUSEF
FT Group, Charlotte, North Carolina Area, USA

Astronomy and Meteorology Department, Faculty of Science, Cairo University, Egypt


Vol./Issue: 13 , id: 385

The heliosphere is the cocoon which engulfs the solar system within. It includes the planets, dwarf planets, the asteroid belt and finally the icy fragments of Kuiper belt objects and the scattered disk objects. The Kuiper belt is rather a thick donut extending from 30 AU inclined by about 0-10 degrees to the ecliptic. Beyond the Kuiper belt. Extend the scattered disc objects, SDOs to perhaps 100 AU and beyond. Most important, the SDOs are the source of periodic comets lasting less than 200 years which is of the order of the De Verie solar cycle. The boundary of the heliosphere is determined by the balance between the solar wind pressure and the stellar wind pressure. At times of reduced solar wind, the heliosphere is pushed inward. Right now we are at the bottom of the 80-120 years Solar Wolf-Gleissberg cycle where weak solar cycle series persists. During the period 1890-2010, the heliosphere oscillated between 75-125 AU. This paper proposes a “pump mechanism” in which scattered disc objects are injected into the inner solar system during times of low solar cycles and the conjunction of Neptune with the Hydrogen wall. We suggest that the inward movement of the heliosphere inject short period comets into the inner solar system. A possible orbital relationship exists between Neptune (164.3 years) and two Wolf-Gleissberg cycles (165 years). As the solar wind has been reduced at present, we suggest an increased frequency of these short period comets after allowing for delay times.