Meteorscatter
PREVIEW of 144 MHz-Activities for the upcomming METEOR-Showers

UPCOMING METEOR SHOWERS: APRIL 2015

After the long wintertime minimum, meteor activity starts growing in April. Most significant shower in this period is medium-rate Lyrids, peaking April 22nd, 24h UT. An IMO investigation in the period 1988-2000 has shown that Lyrids maximum time was variable from year to year between λsol= 32°0 – 32°45 (equivalent to 2015 April 22, 16h UT to April 23, 03h UT). Activity was variable too: the closer the peak to the ideal time (λsol= 32°.32), the higher the ZHR (up to about 23 hr-1), while the further the peak happened from ideal time, the lower the ZHRs were, down to 14 hr-1. Even shower’s peak length was inconstant, with FWHM ranging between 14.8 to 61.7 hours; however, typically Lyrids have a short, quite sharp maximum, so the best rates are normally achieved for just a few hours or so. The analysis also indicated that occasionally, as the highest rates occurred, the Lyrids produced a brief increase in fainter meteors. The last very high maximum was in 1982, when a short lived ZHR of 90 was recorded.

For 2015, meteor scientist Esko Lyytinen has suggested the possibility that Lyrids rates may be somewhat enhanced, although chances of such enhancement seem better in 2016 and 2017. Forecasts are uncertain, since they are heavily dependent on what other dust trails pass closer to the Earth than the trail established from the one observed return of the shower’s parent comet, C/1861 G1 Tatcher: that cannot be modelled at the present time.

Southern Emisphere observers will pay attention to π-Puppids shower; its ZHR is periodic and reached values up to 40 hr-1 when its parent comet (26P / Grigg-Skjellerup) was at perihelion (as in 1977 and 1982). The comet was due at perihelion again in July 2013. No outbursts are expected for this shower in 2015.

Sporadic Meteors annual minimum is over, and SPO rates have started increasing towards their seasonal maximum in late summer. Moreover, some daytime minor showers are also able to increase overall meteor activity. A modest recurring peak in radio rates typically occurs around April 24, due to combined rates of April Piscids, δ-Piscids and ε-Arietids.



For Radio Observers, the (Theoretical) UT peaks for upcoming showers in April 2015 are as follows:

April Piscids (Daytime shower)
Active: April 20 – April 26
Maximum: April 22 (λsol= 32°5)
ZHR: Low

Lyrids
Active: April 16 – April 25
Maximum: April 22, 24h UT (λsol= 32°32)
ZHR: 18 hr-1

π-Puppids (Southern emisphere shower)
Active: April 15 – April 28
Maximum: April 24 (λsol= 33°5)
ZHR: Variable, but typically Low

(Source: IMO)




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As for past MS-Showers, the VHF-DX-Portal MMMonVHF will produce an up to date MS OVERVIEW concerning the next major Meteor Shower.


MMMonVHF since 2008, is archiving the ACTIVITY-OVERVIEWS related to the past major MS-Shower:

MS-SPRINT & PERSEIDS 2008:
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BCC & GEMINIDS 2008:
OVERVIEW PDF-File & SQUARE-MAP

MS-SPRINT & PERSEIDS 2009:
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BCC & GEMINIDS 2009:
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MS-SPRINT & PERSEIDS 2010:
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BCC & GEMINIDS 2010:
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MS-SPRINT & PERSEIDS 2011:
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BCC & GEMINIDS 2011:
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