On the detectability of solar X-ray flares using very low frequency sudden phase anomalies

Details On the detectability of solar X-ray flares using very low frequency sudden phase anomalies On the detectability of solar X-ray flares using very low frequency sudden phase anomalies

Publishing date

Jun 2006

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jastp..68.1029r&link_type=abstract

Journals

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 68, Issue 9, p. 1029-1035.

Science

Physics

Additional info 2

8

Type

Scientific paper

Abstract

We have studied ionization excesses produced by enhancements of X-ray emission during solar flares using the very low frequency (VLF) response of the lower edge of the ionospheric D region. We focus on whether or not the X-rays associated with a given solar flare were responsible for a sudden phase anomaly (SPA) event, independently of the characteristics of the SPA. Approximately 1300 and 200 solar events were found to cause an ionospheric event, during periods of high and low solar activity, respectively. The main results of the present work are: (i) definite spectral characteristics are required for a solar flare to produce a measurable SPA; (ii) the probability of SPA occurrence due to faint solar flares, of X-ray class C1 C2 or lower, is higher during solar minimum; (iii) the same probability for more intense solar flares (class C3 or higher) does not depend on the solar activity conditions. Our observations suggest that the low ionosphere has different sensitivities depending on the solar activity, being more sensitive when the Sun is less active. These results also constitute an observational confirmation of recent findings showing that the ionospheric reference height is lower (by about ⩽1 km) during solar maximum.

Affiliated with

Also associated with

No associations

Rating

On the detectability of solar X-ray flares using very low frequency sudden phase anomalies 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 On the detectability of solar X-ray flares using very low frequency sudden phase anomalies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the detectability of solar X-ray flares using very low frequency sudden phase anomalies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1062806