Short timescale variation in the ENA flux emanating from the heliospheric poles: IBEX observations

Details Short timescale variation in the ENA flux emanating from the heliospheric poles: IBEX observations Short timescale variation in the ENA flux emanating from the heliospheric poles: IBEX observations

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh31b..05r&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH31B-05

Physics

[2124] Interplanetary Physics / Heliopause And Solar Wind Termination, [2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions

Scientific paper

The Interstellar Boundary Explorer (IBEX) completes a full sweep of the sky once every six months; thus in general, if we seek evidence for temporal variation in the heliospheric ENA flux, we must wait six months before revisiting the same part of the sky [see McComas, et al., “Time variations of the ENA flux observed by IBEX: Is the outer heliosphere evolving?”, this session]. However, due to the constant sun-pointing orientation of the IBEX spin axis, two points on the sky, the ecliptic poles, are observed continuously. Thus we can examine if the heliosphere is changing on timescales shorter than six months at the poles, by tracking the evolution of ENA flux emanating from these regions. Our preliminary findings suggest that on timescales of ~50 days, temporal variations at the poles may be present; however, the statistical certainty is small. Due to time dispersion within the IBEX energy passbands, this is at the limit of achievable time resolution. The presence of time variability at the poles would be surprising, since solar variability is presumably the main driver of fluctuations at the interstellar boundary, and solar activity has been nearly absent over the current extended solar minimum.

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