Observing Evolution in the Supergranular Length Scale During Periods of Low Solar Activity

Details Observing Evolution in the Supergranular Length Scale During Periods of Low Solar Activity Observing Evolution in the Supergranular Length Scale During Periods of Low Solar Activity

2011-02-01

arxiv.org/abs/1102.0303v3

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 5 figures - ApJL. We thank Frank Eparvier, Tom Woods, Stan Solomon, Anna Malanushenko, and Rachel Hauser for useful d

Scientific paper

We present the initial results of an observational study into the variation of the dominant length-scale of quiet solar emission: supergranulation. This length-scale reflects the radiative energy in the plasma of the upper solar chromosphere and transition region at the magnetic network boundaries forming as a result of the relentless interaction of magnetic fields and convective motions of the Sun's interior. We demonstrate that a net difference of ~0.5Mm in the supergranular emission length-scale occurs when comparing observations cycle 22/23 and cycle 23/24 minima. This variation in scale is reproduced in the datasets of multiple space- and ground-based instruments and using different diagnostic measures. By means of extension, we consider the variation of the supergranular length-scale over multiple solar minima by analyzing a subset of the Mt Wilson Solar Observatory (MWO) Ca II K image record. The observations and analysis presented provide a tantalizing look at solar activity in the absence of large-scale flux emergence, offering insight into times of "extreme" solar minimum and general behavior such as the phasing and cross-dependence of different components of the spectral irradiance. Given that the modulation of the supergranular scale imprints itself in variations of the Sun's spectral irradiance, as well as in the mass and energy transport into the entire outer atmosphere, this preliminary investigation is an important step in understanding the impact of the quiet sun on the heliospheric system.

Affiliated with

Also associated with

No associations

Rating

Observing Evolution in the Supergranular Length Scale During Periods of Low Solar Activity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Observing Evolution in the Supergranular Length Scale During Periods of Low Solar Activity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observing Evolution in the Supergranular Length Scale During Periods of Low Solar Activity will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-79344