Quantifying and containing the curse of high resolution coronal imaging

Details Quantifying and containing the curse of high resolution coronal imaging Quantifying and containing the curse of high resolution coronal imaging

2008-08-22

arxiv.org/abs/0808.3068v1

Astronomy and Astrophysics

Astrophysics

25 pages, 1 table, 7 figures

Scientific paper

Future missions such as Solar Orbiter (SO), InterHelioprobe, or Solar Probe aim at approaching the Sun closer than ever before, with on board some high resolution imagers (HRI) having a subsecond cadence and a pixel area of about $(80km)^2$ at the Sun during perihelion. In order to guarantee their scientific success, it is necessary to evaluate if the photon counts available at these resolution and cadence will provide a sufficient signal-to-noise ratio (SNR). We perform a first step in this direction by analyzing and characterizing the spatial intermittency of Quiet Sun images thanks to a multifractal analysis. We identify the parameters that specify the scale-invariance behavior. This identification allows next to select a family of multifractal processes, namely the Compound Poisson Cascades, that can synthesize artificial images having some of the scale-invariance properties observed on the recorded images. The prevalence of self-similarity in Quiet Sun coronal images makes it relevant to study the ratio between the SNR present at SoHO/EIT images and in coarsened images. SoHO/EIT images thus play the role of 'high resolution' images, whereas the 'low-resolution' coarsened images are rebinned so as to simulate a smaller angular resolution and/or a larger distance to the Sun. For a fixed difference in angular resolution and in Spacecraft-Sun distance, we determine the proportion of pixels having a SNR preserved at high resolution given a particular increase in effective area. If scale-invariance continues to prevail at smaller scales, the conclusion reached with SoHO/EIT images can be transposed to the situation where the resolution is increased from SoHO/EIT to SO/HRI resolution at perihelion.

Affiliated with

Also associated with

No associations

Rating

Quantifying and containing the curse of high resolution coronal imaging 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 Quantifying and containing the curse of high resolution coronal imaging, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantifying and containing the curse of high resolution coronal imaging will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-185686