Diurnal and seasonal variability of sporadic meteor flux: First observations of pre-sunrise secondary peak from Thumba

Details Diurnal and seasonal variability of sporadic meteor flux: First observations of pre-sunrise secondary peak from Thumba Diurnal and seasonal variability of sporadic meteor flux: First observations of pre-sunrise secondary peak from Thumba

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa21b1446p&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA21B-1446

Physics

[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2437] Ionosphere / Ionospheric Dynamics, [2439] Ionosphere / Ionospheric Irregularities, [2471] Ionosphere / Plasma Waves And Instabilities

Scientific paper

In this paper, we present diurnal variations of sporadic meteor flux rate based on radar observations made from Thumba (8.5oN, 77oE), located near the magnetic equator in the southern part of India. These observations are compared with the observations at Darwin, Buckland Park, and Davis, which are located at low, mid, and high latitudes, respectively, to examine the latitudinal differences in the sporadic meteor flux. The important observation is the occurrence of a secondary peak around 0300 LT at Thumba prior to the occurrence of the commonly observed morning peak around 0600 LT at all latitudes. This secondary peak has not been observed at Darwin, which is a low latitude station close to that of Thumba but in the southern hemisphere. Further, we find that this secondary peak has a clear seasonal variation. In summer (winter), the primary (secondary) peak is larger than the secondary (primary) peak while the primary and secondary peaks are comparable in equinoxes. Recent observations and models suggest that the main source seems to be earth’s apex with ~ 30% - 60 % contribution and the remaining are mostly originated from the helion and antihelion sources with a small contribution from south and north toroidal sources. However, the small scale features such as secondary peak in the diurnal meteor rate can be explained by the right combination of contribution from apex as well as helion and antihelion sources. Our observations are in good agreement with the results presented by the models of Janches et al. [2006], Fentzke and Janches [2008], and Fentzke et al. [2009].The observed diurnal rates also show seasonal and also latitudinal variabilities, which are interpreted in terms of observing geometry of the sporadic meteor sources in the local sky.

Affiliated with

Also associated with

No associations

Rating

Diurnal and seasonal variability of sporadic meteor flux: First observations of pre-sunrise secondary peak from Thumba 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 Diurnal and seasonal variability of sporadic meteor flux: First observations of pre-sunrise secondary peak from Thumba, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diurnal and seasonal variability of sporadic meteor flux: First observations of pre-sunrise secondary peak from Thumba will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1778090