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

UPCOMING METEOR SHOWERS: AUGUST 2014

One of the most popular meteor showers, the Perseids, is coming. Although this shower has proven to be very dynamic in recent years, only the “normal” peak, with ZHR around 100 hr-1, is expected to occur this year. According to IMO, the maximum in 2014 is expected to occur on August 13, most likely around 00h to 03h UT, with peak having ZHR = 100 hr-1. No encounters with other trails are expected this year.
Please note that recent IMO observations found that timing of “traditional” broad maximum varied between λsol=139°8 to 140°3, equivalent to 2014 August 12, 19 UT to August 13, 08 UT. Node is at λsol=140°0-140°1. Note also that modelling by J. Vaubaillon suggests the peak may be earlier, during the second half of August 12th.

Of course, some minor showers will also be active in August, κ-Cygnids and daylight γ-Leonids being the most significant.
Last but not least, don’t forget the great help given by Sporadic Meteors: their rates are very close to annual maximum in August.



For Radio Observers, the (Theoretical) UT peaks for upcoming showers in August 2014 are as follows:

Perseids
Active: July 17 – August 24
Maximum: August 13, 00h15m UT (λsol= 140°0)
ZHR: HIGH (100 hr-1)

κ-Cignids
Active: August 03 – August 25
Maximum: August 18 (λsol= 145°)
ZHR: Low

γ-Leonids (Daytime shower)
Active: August 14 – September 12
Maximum: August 25 (λsol= 152°2)
ZHR: Low

(Source: IMO)



Some tips about Perseids:

The Perseids Radiant is circumpolar (that means, is above horizon the entire day) for every observer northern of about 32°N latitude during shower activity.

For a Central Europe observer (say, in JN59 square and surroundings) the radiant is relatively low above horizon in late afternoon/early evening (15-18 UT) and rather high above horizon in early morning (03-06 UT). Optimal height of radiant above horizon for best radio efficiency can be found between 21 UT and 01 UT, and between 08 UT and 12 UT.

For the Central Europe observer mentioned above, the relative radiant position favors the radio paths in NE/SW direction in morning and early afternoon hours, and NW/SE direction during night hours. Best geometric efficiency direction Vs. Time around Perseids maximum can thus be summarized as follows:

Direction of radio path vs. Time for best efficiency (UT):

N/S: 8 - 11 and 23 – 02
NE/SW: 8 - 13
E/W: 10 – 13 and 20 – 23
NW/SE: 20 – 02


This calculation is valid for the center Europe observer as mentioned. Moving significantly away from that area will somewhat change the times for best efficiency, so this table should be used only for an approximate evaluation (although somehow valid for most Europe). Check your actual directions for best efficiency Vs. Time for your area, using tools like Virgo, OH5IY soft and so on. Please note that the above calculated efficiency applies better on Underdense trails ( that produce Pings), while Overdense trails ( that produce longer Bursts) are somewhat less dependent by geometry (radiant position with respect to direction of radio path).



Latest ACTIVITY on the 144 MHz Band

Square
[or squares]
Callsign
[of active station]
QRG / QSY
[MHz]
Info about upcoming Activity
MMMonVHF LINK

More info will follow...
MMM
on
VHF
MMMonVHF MS Activity OVERVIEW (PAST SHOWERS)

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:
OVERVIEW PDF-File & SQUARE-MAP

BCC & GEMINIDS 2008:
OVERVIEW PDF-File & SQUARE-MAP

MS-SPRINT & PERSEIDS 2009:
OVERVIEW PDF-File & SQUARE-MAP

BCC & GEMINIDS 2009:
OVERVIEW PDF-File & SQUARE-MAP

MS-SPRINT & PERSEIDS 2010:
OVERVIEW PDF-File & SQUARE-MAP

BCC & GEMINIDS 2010:
OVERVIEW PDF-File & SQUARE-MAP

MS-SPRINT & PERSEIDS 2011:
OVERVIEW PDF-File & SQUARE-MAP

BCC & GEMINIDS 2011:
OVERVIEW PDF-File & SQUARE-MAP




Meteorscatter
Info If you want to read more about the theory, practice, tools and so on please feel free to take a look at some articles in our FORUM.

Today MS
Today's Meteor Activity

The 'Today's Meteor Activity' graphic shows the averaged daily Meteor Activity provided by the Radio Meteor Observing Bulletin (RMOB). It's updated every hour. This graphic is free for linking to from your own website by using this link http://mmmonvhf.de/ms/ms.png