caa a22 4500 445346175 CHVBK 20180317142829.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s11207-011-9777-7 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9777-7 The RHESSI Microflare Height Distribution [Elektronische Daten] [S. Christe, S. Krucker, P. Saint-Hilaire] We present the first in-depth statistical survey of flare source heights observed by RHESSI. Flares were found using a flare-finding algorithm designed to search the 6 - 10keV count-rate when RHESSI's full sensitivity was available in order to find the smallest events (Christe etal. in Astrophys.J. 677, 1385, 2008). Between March 2002 and March 2007, a total of 25 006 events were found. Source locations were determined in the 4 - 10keV, 10 - 15keV, and 15 - 30keV energy ranges for each event. In order to extract the height distribution from the observed projected source positions, a forward-fit model was developed with an assumed source height distribution where height is measured from the photosphere. We find that the best flare height distribution is given by g(h)∝exp (−h/λ) where λ=6.1±0.3Mm is the scale height. A power-law height distribution with a negative power-law index, γ=3.1±0.1 is also consistent with the data. Interpreted as thermal loop-top sources, these heights are compared to loops generated by a potential-field model (PFSS). The measured flare heights distribution are found to be much steeper than the potential-field loop height distribution, which may be a signature of the flare energization process. Springer Science+Business Media B.V. (outside the USA), 2011 Christe S. NASA Goddard Space Flight Center, 20771-0001, Greenbelt, MD, USA aut Krucker S. Space Sciences Laboratory, University of California at Berkeley, 94720-7450, Berkeley, CA, USA aut Saint-Hilaire P. Space Sciences Laboratory, University of California at Berkeley, 94720-7450, Berkeley, CA, USA aut Solar Physics Springer Netherlands 270/2(2011-06-01), 493-502 0038-0938 270:2<493 2011 270 11207 https://doi.org/10.1007/s11207-011-9777-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9777-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Christe S. NASA Goddard Space Flight Center, 20771-0001, Greenbelt, MD, USA aut NATIONALLICENCE 700 1- Krucker S. Space Sciences Laboratory, University of California at Berkeley, 94720-7450, Berkeley, CA, USA aut NATIONALLICENCE 700 1- Saint-Hilaire P. Space Sciences Laboratory, University of California at Berkeley, 94720-7450, Berkeley, CA, USA aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 270/2(2011-06-01), 493-502 0038-0938 270:2<493 2011 270 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer